在Android中的三个活动之间传递捆绑

Question

我有三个活动,我可以称之为A,B和C.我想在这三个活动之间传递信息:A - > B - > C - > A. 在AI中想要检查是否有传递包(第一次启动时,例如不会有一个).数据从AB传递,带有正常捆绑.从B - > CI使用此:

Intent i = new Intent(getApplicationContext(), FlashcardView.class);
             i.putExtra("rattning", rattning);
             i.putExtra("noqs", noqs);
             i.putExtra("categoryid", categoryid);
             CreateTestView.this.finish();
             startActivityForResult(i, 0);

它被收到然后发送到A这样:

  Intent data = new Intent(FlashcardView.this, MenuView.class);
                       data.putExtra("point", point);
                       data.putExtra("noqs", noqs);
                       setResult(RESULT_OK, data);
                       finish();

在A收到这样的:

 @Override 
   protected void onActivityResult( int req, int resp, Intent data ) {
        super.onActivityResult(req, resp, data);
        // process your received "data" from GameActivity ...
        Bundle b = getIntent().getExtras();
        noqs = b.getInt("noqs");
        point = b.getInt("point");
        mTvCat.setText("hhhhhh"+point+noqs);
        publishOnFacebook(point,noqs);
    }

看起来好像捆绑在从C - > A的路上丢失了.当我从C - > B传回来时没有问题.我认为这是因为B是启动C的活动,因此C回落到B而不是A.我通过在B上调用finish()进行复飞,所以C回到A而不是.坚持这样做我失去了捆绑.或者至少我是这么认为的.

谁看过这个吗？有没有更好的方法呢？如何在两次以上的活动之间传递时防止丢失捆绑？谢谢!

编辑:

编辑:这是接收广播时的错误代码:

  03-07 12:57:59.394: ERROR/AndroidRuntime(803): java.lang.RuntimeException: Error receiving broadcast Intent { act=my_action (has extras) } in com.crystalcodeab.Flashcard.MenuView$1@47681ad0
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at android.app.ActivityThread$PackageInfo$ReceiverDispatcher$Args.run(ActivityThread.java:981)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at android.os.Handler.handleCallback(Handler.java:587)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at android.os.Looper.loop(Looper.java:143)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at android.app.ActivityThread.main(ActivityThread.java:5068)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at java.lang.reflect.Method.invokeNative(Native Method)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at java.lang.reflect.Method.invoke(Method.java:521)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at dalvik.system.NativeStart.main(Native Method)
03-07 12:57:59.394: ERROR/AndroidRuntime(803): Caused by: java.lang.NullPointerException
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at com.crystalcodeab.Flashcard.MenuView$1.onReceive(MenuView.java:56)
03-07 12:57:59.394: ERROR/AndroidRuntime(803):     at 

Answer 1

我认为问题在于你如何完成活动B.当你完成活动B时,B的结果被发送回A并且活动消失了.C无法知道它应该将结果返回给A,因为它只知道活动B.

我的建议是你应该在活动A中使用BroadcastReceiver.然后在活动C中你可以发送一个广播,其中包含你希望被A接收的数据:

在一个:

IntentFilter filter = new IntentFilter("my.action");
BroadcastReceiver receiver = new BroadcastReceiver() {
  public void onReceive(Context context, Intent intent) {
    if(intent.getAction().equals("my.action")) {
      // Do my stuff
    }
  }
}
registerReceiver(receiver, filter);

在C:

Intent data = new Intent("my.action");
data.putExtra("point", point);
data.putExtra("noqs", noqs);
sendBroadcast(data);