sendBroadcast

最新推荐文章于 2022-09-14 11:16:18 发布

原创最新推荐文章于 2022-09-14 11:16:18 发布 · 774 阅读

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本文深入探讨了Android系统中ContextImpl.java文件中sendBroadcast方法的实现细节，以及ActivityManagerService.java文件中广播Intent的处理流程，揭示了Android系统内部如何高效地进行应用间消息传递。

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frameworks/base/core/java/android/app/ContextImpl.java

public void sendBroadcast(Intent intent) {

     String resolvedType = intent.resolveTypeIfNeeded(getContentResolver());
     try {
         intent.setAllowFds(false);
         ActivityManagerNative.getDefault().broadcastIntent(
         mMainThread.getApplicationThread(), intent, resolvedType, null,
          Activity.RESULT_OK, null, null, null, false, false);
} catch (RemoteException e) {
      }

}

frameworks/base/services/java/com/android/server/am/ActivityManagerService.java

11935     public final int broadcastIntent(IApplicationThread caller,
11936             Intent intent, String resolvedType, IIntentReceiver resultTo,
11937             int resultCode, String resultData, Bundle map,
11938             String requiredPermission, boolean serialized, boolean sticky) {
11939         synchronized(this) {
11940             intent = verifyBroadcastLocked(intent);
11941
11942             final ProcessRecord callerApp = getRecordForAppLocked(caller);
11943             final int callingPid = Binder.getCallingPid();
11944             final int callingUid = Binder.getCallingUid();
11945             final long origId = Binder.clearCallingIdentity();
11946             int res = broadcastIntentLocked(callerApp,
11947                     callerApp != null ? callerApp.info.packageName : null,
11948                     intent, resolvedType, resultTo,
11949                     resultCode, resultData, map, requiredPermission, serialized,
11950                     sticky, callingPid, callingUid);
11951             Binder.restoreCallingIdentity(origId);
11952             return res;
11953         }
11954     }