BroadcastReceiver流程解析_receiver_visible_to_instant_apps

ContextImpl的registerReceiver方法

首先查看注册方法

@Override
public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter,
        int flags) {
    return registerReceiver(receiver, filter, null, null, flags);
}

内部调用了registerReceiverInternal方法，这个方法里面会调用AMS的registerReceiver方法，这里有个参数rd，很重要，因为后面我们的回调就是在这里类里面。IIntentReceiver是个啥呢，在as里面按ctrl是点不出来的，查看android系统源码，

发现是个AIDL文件。先往下走

private Intent registerReceiverInternal(BroadcastReceiver receiver, int userId,
        IntentFilter filter, String broadcastPermission,
        Handler scheduler, Context context, int flags) {
    IIntentReceiver rd = null;
    if (receiver != null) {
        if (mPackageInfo != null && context != null) {
            if (scheduler == null) {
                scheduler = mMainThread.getHandler();
            }
            rd = mPackageInfo.getReceiverDispatcher(
                receiver, context, scheduler,
                mMainThread.getInstrumentation(), true);
        } else {
            if (scheduler == null) {
                scheduler = mMainThread.getHandler();
            }
            rd = new LoadedApk.ReceiverDispatcher(
                    receiver, context, scheduler, null, true).getIIntentReceiver();
        }
    }
    try {
        final Intent intent = ActivityManager.getService().registerReceiver(
                mMainThread.getApplicationThread(), mBasePackageName, rd, filter,
                broadcastPermission, userId, flags);
        if (intent != null) {
            intent.setExtrasClassLoader(getClassLoader());
            intent.prepareToEnterProcess();
        }
        return intent;
    } catch (RemoteException e) {
        throw e.rethrowFromSystemServer();
    }
}

AMS的registerReceiver方法，将APP端传过来的receiver参数封装到一个ReceiverList对象。

ReceiverList对象又封装到BroadcastFilter对象，BroadcastFilter对象又添加到mReceiverResolver的一个集合里，现在我们知道我们的receiver对象是存到了mReceiverResolver里

public Intent registerReceiver(IApplicationThread caller, String callerPackage,
        IIntentReceiver receiver, IntentFilter filter, String permission, int userId,
        int flags) {
    enforceNotIsolatedCaller("registerReceiver");
    ArrayList<Intent> stickyIntents = null;
    ProcessRecord callerApp = null;
    final boolean visibleToInstantApps
            = (flags & Context.RECEIVER_VISIBLE_TO_INSTANT_APPS) != 0;
    int callingUid;
    int callingPid;
    boolean instantApp;
    synchronized (this) {
        if (callerApp != null && (callerApp.thread == null
                || callerApp.thread.asBinder() != caller.asBinder())) {
            // Original caller already died
            return null;
        }

        ReceiverList rl = mRegisteredReceivers.get(receiver.asBinder());
        if (rl == null) {

//receiver封装到一个ReceiverList对象
            rl = new ReceiverList(this, callerApp, callingPid, callingUid,
                    userId, receiver);
            if (rl.app != null) {
                rl.app.receivers.add(rl);
            } else {
                try {
                    receiver.asBinder().linkToDeath(rl, 0);
                } catch (RemoteException e) {
                    return sticky;
                }
                rl.linkedToDeath = true;
            }
            mRegisteredReceivers.put(receiver.asBinder(), rl);
        }         

//rl又封装到BroadcastFilter

BroadcastFilter bf = new BroadcastFilter(filter, rl, callerPackage,
                permission, callingUid, userId, instantApp, visibleToInstantApps);
        rl.add(bf);
        if (!bf.debugCheck()) {
            Slog.w(TAG