OnActivityResult is never called

问题

I have two standalone applications. Application A and Application B. I want to start activity in application B from Application A and get the results back. In application B there is one more activity. From B second acitivty i get result to B's first activity. Now I want these result back to Application A. But OnActivityResult in A is never called. Following is the code.

Application A:

public void onClickBtnToApplicationB(View v) {
        try {
            final Intent intent = new Intent(Intent.ACTION_MAIN, null);
            final ComponentName cn = new ComponentName("pakacagename","package.class");
            intent.setComponent(cn);
            intent.setAction(Intent.ACTION_MAIN);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                 
            startActivityForResult(intent, REQUEST_CODE);
        } catch (ActivityNotFoundException e) {
        //handle Exception
        } 
    }

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        switch (requestCode) {
            case REQUEST_CODE:
               handleResult(resultCode, intent);
               break;
        }
    }

    public void handleResult(int resultCode, Intent intentResult) {
        switch (resultCode) {
            case RESULT_OK:
                String Result = intentResult.getStringExtra("RESULT");
                // I need Results from Application B here..
                break;

             case RESULT_CANCELED:
                break;
        }
      }

Application B Activity 1.class:

Intent s = new Intent(1.this,2.class);
startActivityForResult(s, REQUEST_CODE_B);
protected void onActivityResult(int requestCode, int resultCode, Intent intentResult) {     
    switch(requestCode){
        case REQUEST_CODE_B:
            handleResult(resultCode, intentResult);
    }
}

public void handleResult(int resultCode, Intent intentResult) {
    switch (resultCode) {
    case RESULT_OK:
        String scanResult = intentResult.getStringExtra("RESULT");
        Intent newintent = new Intent();
        newintent.putExtra("RESULT", scanResult);
        setResult(Activity.RESULT_OK, newintent);
        finish();
        break;

    case RESULT_CANCELED:
        break;
}

回答1:

From the documentation:

Note that this method should only be used with Intent protocols that are defined to return a result. In other protocols (such as ACTION_MAIN or ACTION_VIEW), you may not get the result when you expect. For example, if the activity you are launching uses the singleTask launch mode, it will not run in your task and thus you will immediately receive a cancel result.

来源：https://stackoverflow.com/questions/17976073/onactivityresult-is-never-called

标签

android

onactivityresult