getIntent返回null - Android [重复]

Question

这个问题在这里已有答案：

• Sending data back to the Main Activity in Android 11个答案

我有一个包含三个活动的项目（MainActivity，PlayerActivity和ListActivity）。我想将MainActivity的意图发送到PlayerActivity并在PlayerActivity中选择一个名字并再次传递给MainActivity.

我写了另一个意图，从ListActivity向Mainactivity发送一些数据。

MainActivity到ListActivity工作完美，也是MainActivityto PlayerActivity.但是当PlayerActivitysend意图到MainActivity时，我得到了一个零意图。

这是我的代码：

从ListActivity发送：

mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            Intent intent = getIntent();
            Bundle bundle = intent.getExtras();

            int buttonId = bundle.getInt("buttonID");
            String name = parent.getItemAtPosition(position).toString();

            Intent sendIntentToMainActivity = new Intent(PlayersActivity.this, MainActivity.class);
            Bundle bundle1 = new Bundle();

            bundle1.putString("name", name);
            bundle1.putInt("buttonId", buttonId);

            startActivity(sendIntentToMainActivity);

        }
    });

进入MainActivity：

@Override
protected void onNewIntent(Intent intent) {
    if (intent != null) {
        setIntent(intent);
        Log.d("xxx", "Intent is null");
    }
}

@Override
protected void onResume() {
    super.onResume();

    Intent intent = getIntent();
    Bundle bundle = new Bundle();

    int id = bundle.getInt("buttonID");
    String name = bundle.getString("name");

    if (id == mButton_first_group_frist_name.getId()) {
        mButton_first_group_frist_name.setText(name);
    } else if (id == mButton_first_group_second_name.getId()) {
        mButton_first_group_second_name.setText(name);
    } else if (id == mButton_second_group_frist_name.getId()) {
        mButton_second_group_frist_name.setText(name);
    } else if (id == mButton_second_group_second_name.getId()) {
        mButton_second_group_second_name.setText(name);
    }
}

请帮忙并给出建议

Answer 1

您必须将bundle添加到创建的intent中，当返回onResume时，从intent获取bundle。你可以这样做：

Intent sendIntentToMainActivity = new Intent(PlayersActivity.this, MainActivity.class);
            Bundle bundle1 = new Bundle();

            bundle1.putString("name", name);
            bundle1.putInt("buttonId", buttonId);


            sendIntentToMainActivity.putExtra("bundle",bundle1);
            startActivity(sendIntentToMainActivity);

然后在onResume内：

Intent intent = getIntent();
    Bundle bundle = intent.getBundleExtra("bundle");