Provide Android Broadcast notification when jumping between Android-Framework applications

1. Environment

Qualcomm 865 Android 10

2. Scenario

When the application jumps, the package name of the source app and the package name of the target app are sent through broadcast.

3. Code implementation

frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java

@@ -132,6 +132,14 @@ import java.io.PrintWriter;
 import java.text.DateFormat;
 import java.util.Date;
 
+//added begin
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+import android.os.Parcelable;
+import android.os.HandlerThread;
+//added end
+
 /**
  * Controller for interpreting how and then launching an activity.
  *
@@ -242,6 +250,39 @@ class ActivityStarter {
         void recycle(ActivityStarter starter);
     }
 
+    private Handler mHandler;
+    private static final int DO_SEND_ACTIVITY_LAUNCHES_MSG = 1;
+
+    //added  begin
+    private final class pkgHandler extends Handler {
+        public pkgHandler(Looper looper) {
+            super(looper, null, true);
+        }
+
+        @Override
+        public void handleMessage(Message msg) {
+            switch(msg.what) {
+                case DO_SEND_ACTIVITY_LAUNCHES_MSG:
+                   android.util.Log.d("qxy","ActivityStartController --> handleMessage --> DO_SEND_ACTIVITY_LAUNCHES_MSG");
+                   android.util.Log.d("qxy","Thread.currentThread().getId() = " + Thread.currentThread().getId()
+                     + "\n" + "getMainLooper().getThread().getId() = " + mService.mContext.getMainLooper().getThread().getId());
+                    Bundle bundle = msg.getData();
+                    String pksFrom = bundle.getString("pksFrom");
+                    String pksTo = bundle.getString("pksTo");
+                    android.util.Log.d("qxy","pksFrom ：" + pksFrom + " pksTo = " + pksTo);
+                    Intent mIntent = new Intent();
+                    mIntent.setAction("com.sc.app.launcher.jump");
+                    mIntent.putExtra("pksFrom",pksFrom);
+                    mIntent.putExtra("pksTo",pksTo);
+                    mService.mContext.sendBroadcast(mIntent);
+                    break;
+            }
+        }
+    }
+    //added  end
+
+
+
     /**
      * Default implementation of {@link StarterFactory}.
      */
@@ -1228,6 +1269,27 @@ class ActivityStarter {
         // Collect information about the target of the Intent.
         ActivityInfo aInfo = mSupervisor.resolveActivity(intent, rInfo, startFlags, profilerInfo);
 
+        //add begin
+         /*
+          From -> callingPackage;
+          To -> intent.getComponent().getPackageName();
+         */
+       if(callingPackage != null && !callingPackage.equals(intent.getComponent().getPackageName())){
+            HandlerThread handlerThread = new HandlerThread("handler_thread");
+            handlerThread.start();
+            mHandler = new pkgHandler(handlerThread.getLooper());
+            mHandler.removeMessages(DO_SEND_ACTIVITY_LAUNCHES_MSG);
+            Message msg = mHandler.obtainMessage(DO_SEND_ACTIVITY_LAUNCHES_MSG);
+            Bundle mBundle = new Bundle();
+            mBundle.putString("pksFrom", callingPackage);
+            mBundle.putString("pksTo", intent.getComponent().getPackageName());
+            msg.setData(mBundle);
+            mHandler.sendMessage(msg);
+        }add end
+
+
+
         synchronized (mService.mGlobalLock) {
             final ActivityStack stack = mRootActivityContainer.getTopDisplayFocusedStack();
             stack.mConfigWillChange = globalConfig != null