Android 9.0系统源码_包管理机制（一） PackageInstaller的初始化_com.lbe.security.miui/com.android.packageinstall.p

packages/apps/PackageInstaller/AndroidManifest.xml

        <activity android:name=".InstallStart"
                android:exported="true"
                android:excludeFromRecents="true">
            <intent-filter android:priority="1">
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.INSTALL_PACKAGE" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="file" />
                <data android:scheme="content" />
                <data android:mimeType="application/vnd.android.package-archive" />
            </intent-filter>
            <intent-filter android:priority="1">
                <action android:name="android.intent.action.INSTALL_PACKAGE" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="file" />
                <data android:scheme="package" />
                <data android:scheme="content" />
            </intent-filter>
            <intent-filter android:priority="1">
                <action android:name="android.content.pm.action.CONFIRM_PERMISSIONS" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
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packages/apps/PackageInstaller/src/com/android/packageinstaller/InstallStart.java

package com.android.packageinstaller;

import static com.android.packageinstaller.PackageUtil.getMaxTargetSdkVersionForUid;

import android.Manifest;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.AppGlobals;
import android.app.IActivityManager;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageManager;
import android.content.pm.PackageInstaller;
import android.content.pm.PackageManager;
import android.content.pm.ProviderInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.RemoteException;
import android.support.annotation.Nullable;
import android.util.Log;

import com.android.internal.annotations.VisibleForTesting;

/**
 * Select which activity is the first visible activity of the installation and forward the intent to
 * it.
 */
public class InstallStart extends Activity {
    private static final String LOG_TAG = InstallStart.class.getSimpleName();

    private static final String DOWNLOADS_AUTHORITY = "downloads";
    private IActivityManager mIActivityManager;
    private IPackageManager mIPackageManager;
    private boolean mAbortInstall = false;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mIPackageManager = AppGlobals.getPackageManager();
        Intent intent = getIntent();
        String callingPackage = getCallingPackage();

        // If the activity was started via a PackageInstaller session, we retrieve the calling
        // package from that session
        int sessionId = intent.getIntExtra(PackageInstaller.EXTRA_SESSION_ID, -1);
        if (callingPackage == null && sessionId != -1) {
            PackageInstaller packageInstaller = getPackageManager().getPackageInstaller();
            PackageInstaller.SessionInfo sessionInfo = packageInstaller.getSessionInfo(sessionId);
            callingPackage = (sessionInfo != null) ? sessionInfo.getInstallerPackageName() : null;
        }

        final ApplicationInfo sourceInfo = getSourceInfo(callingPackage);
        final int originatingUid = getOriginatingUid(sourceInfo);
        boolean isTrustedSource = false;
        if (sourceInfo != null
                && (sourceInfo.privateFlags & ApplicationInfo.PRIVATE_FLAG_PRIVILEGED) != 0) {
            isTrustedSource = intent.getBooleanExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, false);
        }

        if (!isTrustedSource && originatingUid != PackageInstaller.SessionParams.UID_UNKNOWN) {
            final int targetSdkVersion = getMaxTargetSdkVersionForUid(this, originatingUid);
            if (targetSdkVersion < 0) {
                Log.w(LOG_TAG, "Cannot get target sdk version for uid " + originatingUid);
                // Invalid originating uid supplied. Abort install.
                mAbortInstall = true;
            } else if (targetSdkVersion >= Build.VERSION_CODES.O && !declaresAppOpPermission(
                    originatingUid, Manifest.permission.REQUEST_INSTALL_PACKAGES)) {
                Log.e(LOG_TAG, "Requesting uid " + originatingUid + " needs to declare permission "
                        + Manifest.permission.REQUEST_INSTALL_PACKAGES);
                mAbortInstall = true;
            }
        }
        if (mAbortInstall) {
            setResult(RESULT_CANCELED);
            finish();
            return;
        }

        Intent nextActivity = new Intent(intent);
        nextActivity.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);

        // The the installation source as the nextActivity thinks this activity is the source, hence
        // set the originating UID and sourceInfo explicitly
        nextActivity.putExtra(PackageInstallerActivity.EXTRA_CALLING_PACKAGE, callingPackage);
        nextActivity.putExtra(PackageInstallerActivity.EXTRA_ORIGINAL_SOURCE_INFO, sourceInfo);
        nextActivity.putExtra(Intent.EXTRA_ORIGINATING_UID, originatingUid);

        if (PackageInstaller.ACTION_CONFIRM_PERMISSIONS.equals(intent.getAction())) {
            nextActivity.setClass(this, PackageInstallerActivity.class);
        } else {
            Uri packageUri = intent.getData();

            if (packageUri != null && (packageUri.getScheme().equals(ContentResolver.SCHEME_FILE)
                    || packageUri.getScheme().equals(ContentResolver.SCHEME_CONTENT))) {
                // Copy file to prevent it from being changed underneath this process
                nextActivity.setClass(this, InstallStaging.class);
            } else if (packageUri != null && packageUri.getScheme().equals(
                    PackageInstallerActivity.SCHEME_PACKAGE)) {
                nextActivity.setClass(this, PackageInstallerActivity.class);
            } else {
                Intent result = new Intent();
                result.putExtra(Intent.EXTRA_INSTALL_RESULT,
                        PackageManager.INSTALL_FAILED_INVALID_URI);
                setResult(RESULT_FIRST_USER, result);

                nextActivity = null;
            }
        }

        if (nextActivity != null) {
            startActivity(nextActivity);
        }
        finish();
    }

    private boolean declaresAppOpPermission(int uid, String permission) {
        try {
            final String[] packages = mIPackageManager.getAppOpPermissionPackages(permission);
            if (packages == null) {
                return false;
            }
            for (String packageName : packages) {
                try {
                    if (uid == getPackageManager().getPackageUid(packageName, 0)) {
                        return true;
                    }
                } catch (PackageManager.NameNotFoundException e) {
                    // Ignore and try the next package
                }
            }
        } catch (RemoteException rexc) {
            // If remote package manager cannot be reached, install will likely fail anyway.
        }
        return false;
    }

    /**
     * @return the ApplicationInfo for the installation source (the calling package), if available
     */
    private ApplicationInfo getSourceInfo(@Nullable String callingPackage) {
        if (callingPackage != null) {
            try {
                return getPackageManager().getApplicationInfo(callingPackage, 0);
            } catch (PackageManager.NameNotFoundException ex) {
                // ignore
            }
        }
        return null;
    }

    /**
     * Get the originating uid if possible, or
     * {@link android.content.pm.PackageInstaller.SessionParams#UID_UNKNOWN} if not available
     *
     * @param sourceInfo The source of this installation
     * @return The UID of the installation source or UID_UNKNOWN
     */
    private int getOriginatingUid(@Nullable ApplicationInfo sourceInfo) {
        // The originating uid from the intent. We only trust/use this if it comes from either
        // the document manager app or the downloads provider
        final int uidFromIntent = getIntent().getIntExtra(Intent.EXTRA_ORIGINATING_UID,
                PackageInstaller.SessionParams.UID_UNKNOWN);

        final int callingUid;
        if (sourceInfo != null) {
            callingUid = sourceInfo.uid;
        } else {
            try {
                callingUid = getIActivityManager()
                        .getLaunchedFromUid(getActivityToken());
            } catch (RemoteException ex) {
                // Cannot reach ActivityManager. Aborting install.
                Log.e(LOG_TAG, "Could not determine the launching uid.");
                mAbortInstall = true;
                return PackageInstaller.SessionParams.UID_UNKNOWN;
            }
        }
        try {
            if (mIPackageManager.checkUidPermission(Manifest.permission.MANAGE_DOCUMENTS,
                    callingUid) == PackageManager.PERMISSION_GRANTED) {
                return uidFromIntent;
            }
        } catch (RemoteException rexc) {
            // Ignore. Should not happen.
        }
        if (isSystemDownloadsProvider(callingUid)) {
            return uidFromIntent;
        }
        // We don't trust uid from the intent. Use the calling uid instead.
        return callingUid;
    }

    private boolean isSystemDownloadsProvider(int uid) {
        final ProviderInfo downloadProviderPackage = getPackageManager().resolveContentProvider(
                DOWNLOADS_AUTHORITY, 0);
        if (downloadProviderPackage == null) {
            // There seems to be no currently enabled downloads provider on the system.
            return false;
        }
        final ApplicationInfo appInfo = downloadProviderPackage.applicationInfo;
        return (appInfo.isSystemApp() && uid == appInfo.uid);
    }

    private IActivityManager getIActivityManager() {
        if (mIActivityManager == null) {
            return ActivityManager.getService();
        }
        return mIActivityManager;
    }

    @VisibleForTesting
    void injectIActivityManager(IActivityManager iActivityManager) {
        mIActivityManager = iActivityManager;
    }
}
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packages/apps/PackageInstaller/src/com/android/packageinstaller/PackageInstallerActivity.java

package com.android.packageinstaller;

import android.Manifest;
import android.app.AlertDialog;
import android.app.AppGlobals;
import android.app.AppOpsManager;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.ActivityNotFoundException;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageManager;
import android.content.pm.PackageInfo;
import android.content.pm.PackageInstaller;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.PackageParser;
import android.content.pm.PackageUserState;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Process;
import android.os.RemoteException;
import android.os.UserManager;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.annotation.StringRes;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AppSecurityPermissions;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.TextView;

import com.android.packageinstaller.permission.ui.OverlayTouchActivity;

import java.io.File;

/**
 * This activity is launched when a new application is installed via side loading
 * The package is first parsed and the user is notified of parse errors via a dialog.
 * If the package is successfully parsed, the user is notified to turn on the install unknown
 * applications setting. A memory check is made at this point and the user is notified of out
 * of memory conditions if any. If the package is already existing on the device,
 * a confirmation dialog (to replace the existing package) is presented to the user.
 * Based on the user response the package is then installed by launching InstallAppConfirm
 * sub activity. All state transitions are handled in this activity
 */
public class PackageInstallerActivity extends OverlayTouchActivity implements OnClickListener {
    private static final String TAG = "PackageInstaller";

    private static final int REQUEST_TRUST_EXTERNAL_SOURCE = 1;

    static final String SCHEME_PACKAGE = "package";

    static final String EXTRA_CALLING_PACKAGE = "EXTRA_CALLING_PACKAGE";
    static final String EXTRA_ORIGINAL_SOURCE_INFO = "EXTRA_ORIGINAL_SOURCE_INFO";
    private static final String ALLOW_UNKNOWN_SOURCES_KEY =
            PackageInstallerActivity.class.getName() + "ALLOW_UNKNOWN_SOURCES_KEY";

    private int mSessionId = -1;
    private Uri mPackageURI;
    private Uri mOriginatingURI;
    private Uri mReferrerURI;
    private int mOriginatingUid = PackageInstaller.SessionParams.UID_UNKNOWN;
    private String mOriginatingPackage; // The package name corresponding to #mOriginatingUid

    private boolean localLOGV = false;
    PackageManager mPm;
    IPackageManager mIpm;
    AppOpsManager mAppOpsManager;
    UserManager mUserManager;
    PackageInstaller mInstaller;
    PackageInfo mPkgInfo;
    String mCallingPackage;
    ApplicationInfo mSourceInfo;

    // ApplicationInfo object primarily used for already existing applications
    private ApplicationInfo mAppInfo = null;

    // Buttons to indicate user acceptance
    private Button mOk;
    private Button mCancel;
    CaffeinatedScrollView mScrollView = null;
    private boolean mOkCanInstall = false;

    private PackageUtil.AppSnippet mAppSnippet;

    static final String PREFS_ALLOWED_SOURCES = "allowed_sources";

    private static final String TAB_ID_ALL = "all";
    private static final String TAB_ID_NEW = "new";

    // Dialog identifiers used in showDialog
    private static final int DLG_BASE = 0;
    private static final int DLG_PACKAGE_ERROR = DLG_BASE + 2;
    private static final int DLG_OUT_OF_SPACE = DLG_BASE + 3;
    private static final int DLG_INSTALL_ERROR = DLG_BASE + 4;
    private static final int DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER = DLG_BASE + 5;
    private static final int DLG_ANONYMOUS_SOURCE = DLG_BASE + 6;
    private static final int DLG_NOT_SUPPORTED_ON_WEAR = DLG_BASE + 7;
    private static final int DLG_EXTERNAL_SOURCE_BLOCKED = DLG_BASE + 8;
    private static final int DLG_INSTALL_APPS_RESTRICTED_FOR_USER = DLG_BASE + 9;

    // If unknown sources are temporary allowed
    private boolean mAllowUnknownSources;

    // Would the mOk button be enabled if this activity would be resumed
    private boolean mEnableOk;

    private void startInstallConfirm() {
        // We might need to show permissions, load layout with permissions
        if (mAppInfo != null) {
            bindUi(R.layout.install_confirm_perm_update, true);
        } else {
            bindUi(R.layout.install_confirm_perm, true);
        }

        ((TextView) findViewById(R.id.install_confirm_question))
                .setText(R.string.install_confirm_question);
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
        ViewPager viewPager = (ViewPager)findViewById(R.id.pager);
        TabsAdapter adapter = new TabsAdapter(this, tabHost, viewPager);
        // If the app supports runtime permissions the new permissions will
        // be requested at runtime, hence we do not show them at install.
        boolean supportsRuntimePermissions = mPkgInfo.applicationInfo.targetSdkVersion
                >= Build.VERSION_CODES.M;
        boolean permVisible = false;
        mScrollView = null;
        mOkCanInstall = false;
        int msg = 0;

        AppSecurityPermissions perms = new AppSecurityPermissions(this, mPkgInfo);
        final int N = perms.getPermissionCount(AppSecurityPermissions.WHICH_ALL);
        if (mAppInfo != null) {
            msg = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0
                    ? R.string.install_confirm_question_update_system
                    : R.string.install_confirm_question_update;
            mScrollView = new CaffeinatedScrollView(this);
            mScrollView.setFillViewport(true);
            boolean newPermissionsFound = false;
            if (!supportsRuntimePermissions) {
                newPermissionsFound =
                        (perms.getPermissionCount(AppSecurityPermissions.WHICH_NEW) > 0);
                if (newPermissionsFound) {
                    permVisible = true;
                    mScrollView.addView(perms.getPermissionsView(
                            AppSecurityPermissions.WHICH_NEW));
                }
            }
            if (!supportsRuntimePermissions && !newPermissionsFound) {
                LayoutInflater inflater = (LayoutInflater)getSystemService(
                        Context.LAYOUT_INFLATER_SERVICE);
                TextView label = (TextView)inflater.inflate(R.layout.label, null);
                label.setText(R.string.no_new_perms);
                mScrollView.addView(label);
            }
            adapter.addTab(tabHost.newTabSpec(TAB_ID_NEW).setIndicator(
                    getText(R.string.newPerms)), mScrollView);
        }
        if (!supportsRuntimePermissions && N > 0) {
            permVisible = true;
            LayoutInflater inflater = (LayoutInflater)getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);
            View root = inflater.inflate(R.layout.permissions_list, null);
            if (mScrollView == null) {
                mScrollView = (CaffeinatedScrollView)root.findViewById(R.id.scrollview);
            }
            ((ViewGroup)root.findViewById(R.id.permission_list)).addView(
                        perms.getPermissionsView(AppSecurityPermissions.WHICH_ALL));
            adapter.addTab(tabHost.newTabSpec(TAB_ID_ALL).setIndicator(
                    getText(R.string.allPerms)), root);
        }
        if (!permVisible) {
            if (mAppInfo != null) {
                // This is an update to an application, but there are no
                // permissions at all.
                msg = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0
                        ? R.string.install_confirm_question_update_system_no_perms
                        : R.string.install_confirm_question_update_no_perms;
            } else {
                // This is a new application with no permissions.
                msg = R.string.install_confirm_question_no_perms;
            }

            // We do not need to show any permissions, load layout without permissions
            bindUi(R.layout.install_confirm, true);
            mScrollView = null;
        }
        if (msg != 0) {
            ((TextView)findViewById(R.id.install_confirm_question)).setText(msg);
        }
        if (mScrollView == null) {
            // There is nothing to scroll view, so the ok button is immediately
            // set to install.
            mOk.setText(R.string.install);
            mOkCanInstall = true;
        } else {
            mScrollView.setFullScrollAction(new Runnable() {
                @Override
                public void run() {
                    mOk.setText(R.string.install);
                    mOkCanInstall = true;
                }
            });
        }
    }

    /**
     * Replace any dialog shown by the dialog with the one for the given {@link #createDialog id}.
     *
     * @param id The dialog type to add
     */
    private void showDialogInner(int id) {
        DialogFragment currentDialog =
                (DialogFragment) getFragmentManager().findFragmentByTag("dialog");
        if (currentDialog != null) {
            currentDialog.dismissAllowingStateLoss();
        }

        DialogFragment newDialog = createDialog(id);
        if (newDialog != null) {
            newDialog.showAllowingStateLoss(getFragmentManager(), "dialog");
        }
    }

    /**
     * Create a new dialog.
     *
     * @param id The id of the dialog (determines dialog type)
     *
     * @return The dialog
     */
    private DialogFragment createDialog(int id) {
        switch (id) {
            case DLG_PACKAGE_ERROR:
                return SimpleErrorDialog.newInstance(R.string.Parse_error_dlg_text);
            case DLG_OUT_OF_SPACE:
                return OutOfSpaceDialog.newInstance(
                        mPm.getApplicationLabel(mPkgInfo.applicationInfo));
            case DLG_INSTALL_ERROR:
                return InstallErrorDialog.newInstance(
                        mPm.getApplicationLabel(mPkgInfo.applicationInfo));
            case DLG_NOT_SUPPORTED_ON_WEAR:
                return NotSupportedOnWearDialog.newInstance();
            case DLG_INSTALL_APPS_RESTRICTED_FOR_USER:
                return SimpleErrorDialog.newInstance(
                        R.string.install_apps_user_restriction_dlg_text);
            case DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER:
                return SimpleErrorDialog.newInstance(
                        R.string.unknown_apps_user_restriction_dlg_text);
            case DLG_EXTERNAL_SOURCE_BLOCKED:
                return ExternalSourcesBlockedDialog.newInstance(mOriginatingPackage);
            case DLG_ANONYMOUS_SOURCE:
                return AnonymousSourceDialog.newInstance();
        }
        return null;
    }

    @Override
    public void onActivityResult(int request, int result, Intent data) {
        if (request == REQUEST_TRUST_EXTERNAL_SOURCE && result == RESULT_OK) {
            // The user has just allowed this package to install other packages (via Settings).
            mAllowUnknownSources = true;

            // Log the fact that the app is requesting an install, and is now allowed to do it
            // (before this point we could only log that it's requesting an install, but isn't
            // allowed to do it yet).
            int appOpCode =
                    AppOpsManager.permissionToOpCode(Manifest.permission.REQUEST_INSTALL_PACKAGES);
            mAppOpsManager.noteOpNoThrow(appOpCode, mOriginatingUid, mOriginatingPackage);

            DialogFragment currentDialog =
                    (DialogFragment) getFragmentManager().findFragmentByTag("dialog");
            if (currentDialog != null) {
                currentDialog.dismissAllowingStateLoss();
            }

            initiateInstall();
        } else {
            finish();
        }
    }

    private String getPackageNameForUid(int sourceUid) {
        String[] packagesForUid = mPm.getPackagesForUid(sourceUid);
        if (packagesForUid == null) {
            return null;
        }
        if (packagesForUid.length > 1) {
            if (mCallingPackage != null) {
                for (String packageName : packagesForUid) {
                    if (packageName.equals(mCallingPackage)) {
                        return packageName;
                    }
                }
            }
            Log.i(TAG, "Multiple packages found for source uid " + sourceUid);
        }
        return packagesForUid[0];
    }

    private boolean isInstallRequestFromUnknownSource(Intent intent) {
        if (mCallingPackage != null && intent.getBooleanExtra(
                Intent.EXTRA_NOT_UNKNOWN_SOURCE, false)) {
            if (mSourceInfo != null) {
                if ((mSourceInfo.privateFlags & ApplicationInfo.PRIVATE_FLAG_PRIVILEGED)
                        != 0) {
                    // Privileged apps can bypass unknown sources check if they want.
                    return false;
                }
            }
        }
        return true;
    }

    private void initiateInstall() {
        String pkgName = mPkgInfo.packageName;
        // Check if there is already a package on the device with this name
        // but it has been renamed to something else.
        String[] oldName = mPm.canonicalToCurrentPackageNames(new String[] { pkgName });
        if (oldName != null && oldName.length > 0 && oldName[0] != null) {
            pkgName = oldName[0];
            mPkgInfo.packageName = pkgName;
            mPkgInfo.applicationInfo.packageName = pkgName;
        }
        // Check if package is already installed. display confirmation dialog if replacing pkg
        try {
            // This is a little convoluted because we want to get all uninstalled
            // apps, but this may include apps with just data, and if it is just
            // data we still want to count it as "installed".
            mAppInfo = mPm.getApplicationInfo(pkgName,
                    PackageManager.MATCH_UNINSTALLED_PACKAGES);
            if ((mAppInfo.flags&ApplicationInfo.FLAG_INSTALLED) == 0) {
                mAppInfo = null;
            }
        } catch (NameNotFoundException e) {
            mAppInfo = null;
        }

        startInstallConfirm();
    }

    void setPmResult(int pmResult) {
        Intent result = new Intent();
        result.putExtra(Intent.EXTRA_INSTALL_RESULT, pmResult);
        setResult(pmResult == PackageManager.INSTALL_SUCCEEDED
                ? RESULT_OK : RESULT_FIRST_USER, result);
    }

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(null);

        if (icicle != null) {
            mAllowUnknownSources = icicle.getBoolean(ALLOW_UNKNOWN_SOURCES_KEY);
        }

        mPm = getPackageManager();
        mIpm = AppGlobals.getPackageManager();
        mAppOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
        mInstaller = mPm.getPackageInstaller();
        mUserManager = (UserManager) getSystemService(Context.USER_SERVICE);

        final Intent intent = getIntent();

        mCallingPackage = intent.getStringExtra(EXTRA_CALLING_PACKAGE);
        mSourceInfo = intent.getParcelableExtra(EXTRA_ORIGINAL_SOURCE_INFO);
        mOriginatingUid = intent.getIntExtra(Intent.EXTRA_ORIGINATING_UID,
                PackageInstaller.SessionParams.UID_UNKNOWN);
        mOriginatingPackage = (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN)
                ? getPackageNameForUid(mOriginatingUid) : null;


        final Uri packageUri;

        if (PackageInstaller.ACTION_CONFIRM_PERMISSIONS.equals(intent.getAction())) {
            final int sessionId = intent.getIntExtra(PackageInstaller.EXTRA_SESSION_ID, -1);
            final PackageInstaller.SessionInfo info = mInstaller.getSessionInfo(sessionId);
            if (info == null || !info.sealed || info.resolvedBaseCodePath == null) {
                Log.w(TAG, "Session " + mSessionId + " in funky state; ignoring");
                finish();
                return;
            }

            mSessionId = sessionId;
            packageUri = Uri.fromFile(new File(info.resolvedBaseCodePath));
            mOriginatingURI = null;
            mReferrerURI = null;
        } else {
            mSessionId = -1;
            packageUri = intent.getData();
            mOriginatingURI = intent.getParcelableExtra(Intent.EXTRA_ORIGINATING_URI);
            mReferrerURI = intent.getParcelableExtra(Intent.EXTRA_REFERRER);
        }

        // if there's nothing to do, quietly slip into the ether
        if (packageUri == null) {
            Log.w(TAG, "Unspecified source");
            setPmResult(PackageManager.INSTALL_FAILED_INVALID_URI);
            finish();
            return;
        }

        if (DeviceUtils.isWear(this)) {
            showDialogInner(DLG_NOT_SUPPORTED_ON_WEAR);
            return;
        }

        boolean wasSetUp = processPackageUri(packageUri);
        if (!wasSetUp) {
            return;
        }

        // load dummy layout with OK button disabled until we override this layout in
        // startInstallConfirm
        bindUi(R.layout.install_confirm, false);
        checkIfAllowedAndInitiateInstall();
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (mOk != null) {
            mOk.setEnabled(mEnableOk);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (mOk != null) {
            // Don't allow the install button to be clicked as there might be overlays
            mOk.setEnabled(false);
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        outState.putBoolean(ALLOW_UNKNOWN_SOURCES_KEY, mAllowUnknownSources);
    }

    private void bindUi(int layout, boolean enableOk) {
        setContentView(layout);

        mOk = (Button) findViewById(R.id.ok_button);
        mCancel = (Button)findViewById(R.id.cancel_button);
        mOk.setOnClickListener(this);
        mCancel.setOnClickListener(this);

        mEnableOk = enableOk;
        mOk.setEnabled(enableOk);

        PackageUtil.initSnippetForNewApp(this, mAppSnippet, R.id.app_snippet);
    }

    /**
     * Check if it is allowed to install the package and initiate install if allowed. If not allowed
     * show the appropriate dialog.
     */
    private void checkIfAllowedAndInitiateInstall() {
        // Check for install apps user restriction first.
        final int installAppsRestrictionSource = mUserManager.getUserRestrictionSource(
                UserManager.DISALLOW_INSTALL_APPS, Process.myUserHandle());
        if ((installAppsRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) {
            showDialogInner(DLG_INSTALL_APPS_RESTRICTED_FOR_USER);
            return;
        } else if (installAppsRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
            startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));
            finish();
            return;
        }

        if (mAllowUnknownSources || !isInstallRequestFromUnknownSource(getIntent())) {
            initiateInstall();
        } else {
            // Check for unknown sources restriction
            final int unknownSourcesRestrictionSource = mUserManager.getUserRestrictionSource(
                    UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES, Process.myUserHandle());
            if ((unknownSourcesRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) {
                showDialogInner(DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER);
            } else if (unknownSourcesRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
                startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));
                finish();
            } else {
                handleUnknownSources();
            }
        }
    }

    private void handleUnknownSources() {
        if (mOriginatingPackage == null) {
            Log.i(TAG, "No source found for package " + mPkgInfo.packageName);
            showDialogInner(DLG_ANONYMOUS_SOURCE);
            return;
        }
        // Shouldn't use static constant directly, see b/65534401.
        final int appOpCode =
                AppOpsManager.permissionToOpCode(Manifest.permission.REQUEST_INSTALL_PACKAGES);
        final int appOpMode = mAppOpsManager.noteOpNoThrow(appOpCode,
                mOriginatingUid, mOriginatingPackage);
        switch (appOpMode) {
            case AppOpsManager.MODE_DEFAULT:
                try {
                    int result = mIpm.checkUidPermission(
                            Manifest.permission.REQUEST_INSTALL_PACKAGES, mOriginatingUid);
                    if (result == PackageManager.PERMISSION_GRANTED) {
                        initiateInstall();
                        break;
                    }
                } catch (RemoteException exc) {
                    Log.e(TAG, "Unable to talk to package manager");
                }
                mAppOpsManager.setMode(appOpCode, mOriginatingUid,
                        mOriginatingPackage, AppOpsManager.MODE_ERRORED);
                // fall through
            case AppOpsManager.MODE_ERRORED:
                showDialogInner(DLG_EXTERNAL_SOURCE_BLOCKED);
                break;
            case AppOpsManager.MODE_ALLOWED:
                initiateInstall();
                break;
            default:
                Log.e(TAG, "Invalid app op mode " + appOpMode
                        + " for OP_REQUEST_INSTALL_PACKAGES found for uid " + mOriginatingUid);
                finish();
                break;
        }
    }

    /**
     * Parse the Uri and set up the installer for this package.
     *
     * @param packageUri The URI to parse
     *
     * @return {@code true} iff the installer could be set up
     */
    private boolean processPackageUri(final Uri packageUri) {
        mPackageURI = packageUri;

        final String scheme = packageUri.getScheme();

        switch (scheme) {
            case SCHEME_PACKAGE: {
                try {
                    mPkgInfo = mPm.getPackageInfo(packageUri.getSchemeSpecificPart(),
                            PackageManager.GET_PERMISSIONS
                                    | PackageManager.MATCH_UNINSTALLED_PACKAGES);
                } catch (NameNotFoundException e) {
                }
                if (mPkgInfo == null) {
                    Log.w(TAG, "Requested package " + packageUri.getScheme()
                            + " not available. Discontinuing installation");
                    showDialogInner(DLG_PACKAGE_ERROR);
                    setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);
                    return false;
                }
                mAppSnippet = new PackageUtil.AppSnippet(mPm.getApplicationLabel(mPkgInfo.applicationInfo),
                        mPm.getApplicationIcon(mPkgInfo.applicationInfo));
            } break;

            case ContentResolver.SCHEME_FILE: {
                File sourceFile = new File(packageUri.getPath());
                PackageParser.Package parsed = PackageUtil.getPackageInfo(this, sourceFile);

                // Check for parse errors
                if (parsed == null) {
                    Log.w(TAG, "Parse error when parsing manifest. Discontinuing installation");
                    showDialogInner(DLG_PACKAGE_ERROR);
                    setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);
                    return false;
                }
                mPkgInfo = PackageParser.generatePackageInfo(parsed, null,
                        PackageManager.GET_PERMISSIONS, 0, 0, null,
                        new PackageUserState());
                mAppSnippet = PackageUtil.getAppSnippet(this, mPkgInfo.applicationInfo, sourceFile);
            } break;

            default: {
                throw new IllegalArgumentException("Unexpected URI scheme " + packageUri);
            }
        }

        return true;
    }

    @Override
    public void onBackPressed() {
        if (mSessionId != -1) {
            mInstaller.setPermissionsResult(mSessionId, false);
        }
        super.onBackPressed();
    }

    public void onClick(View v) {
        if (v == mOk) {
            if (mOk.isEnabled()) {
                if (mOkCanInstall || mScrollView == null) {
                    if (mSessionId != -1) {
                        mInstaller.setPermissionsResult(mSessionId, true);
                        finish();
                    } else {
                        startInstall();
                    }
                } else {
                    mScrollView.pageScroll(View.FOCUS_DOWN);
                }
            }
        } else if (v == mCancel) {
            // Cancel and finish
            setResult(RESULT_CANCELED);
            if (mSessionId != -1) {
                mInstaller.setPermissionsResult(mSessionId, false);
            }
            finish();
        }
    }

    private void startInstall() {
        // Start subactivity to actually install the application
        Intent newIntent = new Intent();
        newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,
                mPkgInfo.applicationInfo);
        newIntent.setData(mPackageURI);
        newIntent.setClass(this, InstallInstalling.class);
        String installerPackageName = getIntent().getStringExtra(
                Intent.EXTRA_INSTALLER_PACKAGE_NAME);
        if (mOriginatingURI != null) {
            newIntent.putExtra(Intent.EXTRA_ORIGINATING_URI, mOriginatingURI);
        }
        if (mReferrerURI != null) {
            newIntent.putExtra(Intent.EXTRA_REFERRER, mReferrerURI);
        }
        if (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN) {
            newIntent.putExtra(Intent.EXTRA_ORIGINATING_UID, mOriginatingUid);
        }
        if (installerPackageName != null) {
            newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,
                    installerPackageName);
        }
        if (getIntent().getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
            newIntent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
        }
        newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
        if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);
        startActivity(newIntent);
        finish();
    }

    /**
     * A simple error dialog showing a message
     */
    public static class SimpleErrorDialog extends DialogFragment {
        private static final String MESSAGE_KEY =
                SimpleErrorDialog.class.getName() + "MESSAGE_KEY";

        static SimpleErrorDialog newInstance(@StringRes int message) {
            SimpleErrorDialog dialog = new SimpleErrorDialog();

            Bundle args = new Bundle();
            args.putInt(MESSAGE_KEY, message);
            dialog.setArguments(args);

            return dialog;
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return new AlertDialog.Builder(getActivity())
                    .setMessage(getArguments().getInt(MESSAGE_KEY))
                    .setPositiveButton(R.string.ok, (dialog, which) -> getActivity().finish())
                    .create();
        }
    }

    /**
     * Dialog to show when the source of apk can not be identified
     */
    public static class AnonymousSourceDialog extends DialogFragment {
        static AnonymousSourceDialog newInstance() {
            return new AnonymousSourceDialog();
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return new AlertDialog.Builder(getActivity())
                    .setMessage(R.string.anonymous_source_warning)
                    .setPositiveButton(R.string.anonymous_source_continue,
                            ((dialog, which) -> {
                                PackageInstallerActivity activity = ((PackageInstallerActivity)
                                        getActivity());

                                activity.mAllowUnknownSources = true;
                                activity.initiateInstall();
                            }))
                    .setNegativeButton(R.string.cancel, ((dialog, which) -> getActivity().finish()))
                    .create();
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            getActivity().finish();
        }
    }

    /**
     * An error dialog shown when the app is not supported on wear
     */
    public static class NotSupportedOnWearDialog extends SimpleErrorDialog {
        static SimpleErrorDialog newInstance() {
            return SimpleErrorDialog.newInstance(R.string.wear_not_allowed_dlg_text);
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            getActivity().setResult(RESULT_OK);
            getActivity().finish();
        }
    }

    /**
     * An error dialog shown when the device is out of space
     */
    public static class OutOfSpaceDialog extends AppErrorDialog {
        static AppErrorDialog newInstance(@NonNull CharSequence applicationLabel) {
            OutOfSpaceDialog dialog = new OutOfSpaceDialog();
            dialog.setArgument(applicationLabel);
            return dialog;
        }

        @Override
        protected Dialog createDialog(@NonNull CharSequence argument) {
            String dlgText = getString(R.string.out_of_space_dlg_text, argument);
            return new AlertDialog.Builder(getActivity())
                    .setMessage(dlgText)
                    .setPositiveButton(R.string.manage_applications, (dialog, which) -> {
                        // launch manage applications
                        Intent intent = new Intent("android.intent.action.MANAGE_PACKAGE_STORAGE");
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);
                        getActivity().finish();
                    })
                    .setNegativeButton(R.string.cancel, (dialog, which) -> getActivity().finish())
                    .create();
        }
    }

    /**
     * A generic install-error dialog
     */
    public static class InstallErrorDialog extends AppErrorDialog {
        static AppErrorDialog newInstance(@NonNull CharSequence applicationLabel) {
            InstallErrorDialog dialog = new InstallErrorDialog();
            dialog.setArgument(applicationLabel);
            return dialog;
        }

        @Override
        protected Dialog createDialog(@NonNull CharSequence argument) {
            return new AlertDialog.Builder(getActivity())
                    .setNeutralButton(R.string.ok, (dialog, which) -> getActivity().finish())
                    .setMessage(getString(R.string.install_failed_msg, argument))
                    .create();
        }
    }

    /**
     * An error dialog shown when external sources are not allowed
     */
    public static class ExternalSourcesBlockedDialog extends AppErrorDialog {
        static AppErrorDialog newInstance(@NonNull String originationPkg) {
            ExternalSourcesBlockedDialog dialog = new ExternalSourcesBlockedDialog();
            dialog.setArgument(originationPkg);
            return dialog;
        }

        @Override
        protected Dialog createDialog(@NonNull CharSequence argument) {
            try {
                PackageManager pm = getActivity().getPackageManager();

                ApplicationInfo sourceInfo = pm.getApplicationInfo(argument.toString(), 0);

                return new AlertDialog.Builder(getActivity())
                        .setTitle(pm.getApplicationLabel(sourceInfo))
                        .setIcon(pm.getApplicationIcon(sourceInfo))
                        .setMessage(R.string.untrusted_external_source_warning)
                        .setPositiveButton(R.string.external_sources_settings,
                                (dialog, which) -> {
                                    Intent settingsIntent = new Intent();
                                    settingsIntent.setAction(
                                            Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
                                    final Uri packageUri = Uri.parse("package:" + argument);
                                    settingsIntent.setData(packageUri);
                                    try {
                                        getActivity().startActivityForResult(settingsIntent,
                                                REQUEST_TRUST_EXTERNAL_SOURCE);
                                    } catch (ActivityNotFoundException exc) {
                                        Log.e(TAG, "Settings activity not found for action: "
                                                + Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
                                    }
                                })
                        .setNegativeButton(R.string.cancel,
                                (dialog, which) -> getActivity().finish())
                        .create();
            } catch (NameNotFoundException e) {
                Log.e(TAG, "Did not find app info for " + argument);
                getActivity().finish();
                return null;
            }
        }
    }

    /**
     * Superclass for all error dialogs. Stores a single CharSequence argument
     */
    public abstract static class AppErrorDialog extends DialogFragment {
        private static final String ARGUMENT_KEY = AppErrorDialog.class.getName() + "ARGUMENT_KEY";

        protected void setArgument(@NonNull CharSequence argument) {
            Bundle args = new Bundle();
            args.putCharSequence(ARGUMENT_KEY, argument);
            setArguments(args);
        }

        protected abstract Dialog createDialog(@NonNull CharSequence argument);

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return createDialog(getArguments().getString(ARGUMENT_KEY));
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            getActivity().finish();
        }
    }
}

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