为什么 onNewIntent(Intent intent) 方法被调用两次？

Question

I start a new activity with two parameters.

Intent intent = new Intent(WebTestActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);                  
Uri uri =  Uri.parse(url);
intent.setData(uri);
startActivity(intent);

And catch uri in onNewIntent method.

@Override
public void onNewIntent(Intent intent) {  //calls twice
    super.onNewIntent(intent);      
    Uri uri = intent.getData();
    new AsynkTask().execute(uri);
}

But the onNewIntent method is called twice for some unknown reason which doesn't seem to be right.

Answer 1

Intent intent = new Intent(WebTestActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);                  
intent.putExtra("url",url);
startActivity(intent)

In MainActivity;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Bundle extras = getIntent().getExtras();
    String url = extras.getString(url);

}

Then, you can parse the url and use as Uri. By this way, method will not be called twice.

Answer 2

onNewIntent(Intent intent) This is called for activities that set launchMode to "singleTop" in their package, or if a client used the FLAG_ACTIVITY_SINGLE_TOP flag when calling startActivity(Intent).

If it is called twice, it must have been called unintendedly: starting the activity twice? Or manually calling the method?