android icon动态加载,Aandroid 应用icon动态加载到launcher方法及framework分析
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Android launcher动态加载应用icon的方法
在android 应用开发中，我们会遇到应用icon需要动态加载到launcher中的问题。
实现的方法是：
private PackageManager pm;
pm = context.getPackageManager();
pm.setComponentEnabledSetting(new ComponentName(context,"com.uid.pid.New1MainActivity"),PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
PackageManager.DONT_KILL_APP);//加载到launcher中
pm.setComponentEnabledSetting(componentName,PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
PackageManager.DONT_KILL_APP);//从launcher中remove
这个setComponentEnabledSetting 具体是怎么工作的，我们通过framework源码可以知道：
PackageManagerService.java
@Override
public void setComponentEnabledSetting(ComponentName componentName,
int newState, int flags, int userId) {
if (!sUserManager.exists(userId)) return;
/* SPRD: update label and icon for app @{ */
String packege = componentName.getPackageName();
Log.w(TAG, packege+" == "+newState+" == "+flags+" "+userId);
if(packege.startsWith("com.android.stk")){
isOpen = true;
}
/* @} */
Log.d(TAG, "kings:packageName=" + componentName.getPackageName()
+ ", className=" + componentName.getClassName());
setEnabledSetting(componentName.getPackageName(),
componentName.getClassName(), newState, flags, userId, null);
}
>
private void setEnabledSetting(final String packageName, String className, int newState,
final int flags, int userId, String callingPackage) {
if (!(newState == COMPONENT_ENABLED_STATE_DEFAULT
|| newState == COMPONENT_ENABLED_STATE_ENABLED
|| newState == COMPONENT_ENABLED_STATE_DISABLED
|| newState == COMPONENT_ENABLED_STATE_DISABLED_USER
|| newState == COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED)) {
throw new IllegalArgumentException("Invalid new component state: "
+ newState);
}
...
scheduleWritePackageRestrictionsLocked(userId);
...
}
void scheduleWritePackageRestrictionsLocked(int userId) {
if (!sUserManager.exists(userId)) return;
mDirtyUsers.add(userId);
if (!mHandler.hasMessages(WRITE_PACKAGE_RESTRICTIONS)) {
mHandler.sendEmptyMessageDelayed(WRITE_PACKAGE_RESTRICTIONS, WRITE_SETTINGS_DELAY);
}
}
case WRITE_PACKAGE_RESTRICTIONS: {
Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
synchronized (mPackages) {
removeMessages(WRITE_PACKAGE_RESTRICTIONS);
for (int userId : mDirtyUsers) {
mSettings.writePackageRestrictionsLPr(userId);
}
mDirtyUsers.clear();
}
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
} break;
从上面可以知道最终调用Settings.java中的writePackageRestrictionsLPr()来实现。
SettingS.java
void writePackageRestrictionsLPr(int userId) {
if (DEBUG_MU) {
Log.i(TAG, "Writing package restrictions for user=" + userId);
}
// Keep the old stopped packages around until we know the new ones have
// been successfully written.
File userPackagesStateFile = getUserPackagesStateFile(userId);
File backupFile = getUserPackagesStateBackupFile(userId);
new File(userPackagesStateFile.getParent()).mkdirs();
if (userPackagesStateFile.exists()) {
// Presence of backup settings file indicates that we failed
// to persist packages earlier. So preserve the older
// backup for future reference since the current packages
// might have been corrupted.
if (!backupFile.exists()) {
if (!userPackagesStateFile.renameTo(backupFile)) {
Slog.wtf(PackageManagerService.TAG,
"Unable to backup user packages state file, "
+ "current changes will be lost at reboot");
return;
}
} else {
userPackagesStateFile.delete();
Slog.w(PackageManagerService.TAG, "Preserving older stopped packages backup");
}
}
try {
final FileOutputStream fstr = new FileOutputStream(userPackagesStateFile);
final BufferedOutputStream str = new BufferedOutputStream(fstr);
final XmlSerializer serializer = new FastXmlSerializer();
serializer.setOutput(str, StandardCharsets.UTF_8.name());
serializer.startDocument(null, true);
serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
serializer.startTag(null, TAG_PACKAGE_RESTRICTIONS);
for (final PackageSetting pkg : mPackages.values()) {
PackageUserState ustate = pkg.readUserState(userId);
if (ustate.stopped || ustate.notLaunched || !ustate.installed
|| ustate.enabled != COMPONENT_ENABLED_STATE_DEFAULT
|| ustate.hidden
|| (ustate.enabledComponents != null
&& ustate.enabledComponents.size() > 0)
|| (ustate.disabledComponents != null
&& ustate.disabledComponents.size() > 0)
|| ustate.blockUninstall
|| (ustate.domainVerificationStatus !=
PackageManager.INTENT_FILTER_DOMAIN_VERIFICATION_STATUS_UNDEFINED)) {
serializer.startTag(null, TAG_PACKAGE);
serializer.attribute(null, ATTR_NAME, pkg.name);
if (DEBUG_MU) Log.i(TAG, " pkg=" + pkg.name + ", state=" + ustate.enabled);
if (!ustate.installed) {
serializer.attribute(null, ATTR_INSTALLED, "false");
}
if (ustate.stopped) {
serializer.attribute(null, ATTR_STOPPED, "true");
}
if (ustate.notLaunched) {
serializer.attribute(null, ATTR_NOT_LAUNCHED, "true");
}
if (ustate.hidden) {
serializer.attribute(null, ATTR_HIDDEN, "true");
}
if (ustate.blockUninstall) {
serializer.attribute(null, ATTR_BLOCK_UNINSTALL, "true");
}
if (ustate.enabled != COMPONENT_ENABLED_STATE_DEFAULT) {
serializer.attribute(null, ATTR_ENABLED,
Integer.toString(ustate.enabled));
if (ustate.lastDisableAppCaller != null) {
serializer.attribute(null, ATTR_ENABLED_CALLER,
ustate.lastDisableAppCaller);
}
}
if (ustate.domainVerificationStatus !=
PackageManager.INTENT_FILTER_DOMAIN_VERIFICATION_STATUS_UNDEFINED) {
serializer.attribute(null, ATTR_DOMAIN_VERIFICATON_STATE,
Integer.toString(ustate.domainVerificationStatus));
}
if (ustate.appLinkGeneration != 0) {
serializer.attribute(null, ATTR_APP_LINK_GENERATION,
Integer.toString(ustate.appLinkGeneration));
}
if (ustate.enabledComponents != null
&& ustate.enabledComponents.size() > 0) {
serializer.startTag(null, TAG_ENABLED_COMPONENTS);
for (final String name : ustate.enabledComponents) {
serializer.startTag(null, TAG_ITEM);
serializer.attribute(null, ATTR_NAME, name);
serializer.endTag(null, TAG_ITEM);
}
serializer.endTag(null, TAG_ENABLED_COMPONENTS);
}
if (ustate.disabledComponents != null
&& ustate.disabledComponents.size() > 0) {
serializer.startTag(null, TAG_DISABLED_COMPONENTS);
for (final String name : ustate.disabledComponents) {
serializer.startTag(null, TAG_ITEM);
serializer.attribute(null, ATTR_NAME, name);
serializer.endTag(null, TAG_ITEM);
}
serializer.endTag(null, TAG_DISABLED_COMPONENTS);
}
serializer.endTag(null, TAG_PACKAGE);
}
}
writePreferredActivitiesLPr(serializer, userId, true);
writePersistentPreferredActivitiesLPr(serializer, userId);
writeCrossProfileIntentFiltersLPr(serializer, userId);
writeDefaultAppsLPr(serializer, userId);
serializer.endTag(null, TAG_PACKAGE_RESTRICTIONS);
serializer.endDocument();
str.flush();
FileUtils.sync(fstr);
str.close();
// New settings successfully written, old ones are no longer
// needed.
backupFile.delete();
FileUtils.setPermissions(userPackagesStateFile.toString(),
FileUtils.S_IRUSR|FileUtils.S_IWUSR
|FileUtils.S_IRGRP|FileUtils.S_IWGRP,
-1, -1);
// Done, all is good!
return;
} catch(java.io.IOException e) {
Slog.wtf(PackageManagerService.TAG,
"Unable to write package manager user packages state, "
+ " current changes will be lost at reboot", e);
}
// Clean up partially written files
if (userPackagesStateFile.exists()) {
if (!userPackagesStateFile.delete()) {
Log.i(PackageManagerService.TAG, "Failed to clean up mangled file: "
+ mStoppedPackagesFilename);
}
}
}
通过上面接口发现，android最终将这些componame 保存到手机系统/data/system/users/0/package-restrictions.xml 中
