设置Activity的启动模式为singleTask接收不到intent的解决方法+启动模式为standard时，onNewIntent未被调用

来源：互联网发布：归来知乎编辑：程序博客网时间：2024/05/22 12:35

-------- 情景重现

MainActivity的启动模式设置为singleTask

  <activity            android:name=".MainActivity"            android:launchMode="singleTask">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name=".MainActivity2"            android:launchMode="standard"></activity>

MainActivity打开MainActivity2 ； MainActivity2再打开MainActivity ，并用intent向MainActivity传值

public class MainActivity extends AppCompatActivity {    private static final String TAG = MainActivity.class.getSimpleName();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Log.i(TAG, "onCreate: 111111111");        initView();    }    @Override    protected void onNewIntent(Intent intent) {//在onStart之前被调用        super.onNewIntent(intent);        Log.i(TAG, "onNewIntent: 111111111   intent param = " + intent.getStringExtra("key"));    }    @Override    protected void onStart() {        super.onStart();        Log.i(TAG, "onStart: 11111111111111111 intent param = " + getIntent().getStringExtra("key"));    }    @Override    protected void onResume() {        super.onResume();        Log.i(TAG, "onResume: 11111111111");    }    private void initView() {        TextView tvFinish = (TextView) findViewById(R.id.tv_finish);        tvFinish.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                startActivity(new Intent(getApplicationContext(), MainActivity2.class));            }        });    }}

public class MainActivity2 extends AppCompatActivity {    private static final String TAG = MainActivity2.class.getSimpleName();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Log.i(TAG, "onCreate: 22222222");        initView();    }    private void initView() {        TextView tvFinish = (TextView) findViewById(R.id.tv_finish);        tvFinish.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent = new Intent(getApplicationContext(), MainActivity.class);                intent.putExtra("key", "value");                startActivity(intent);            }        });    }

结果：

03-26 15:39:22.661 25903-25903/com.qingmu.onsaveinstancestate I/MainActivity: onNewIntent: 111111111   intent param = value03-26 15:39:22.661 25903-25903/com.qingmu.onsaveinstancestate I/MainActivity: onStart: 11111111111111111 intent param = null

在MainActivity的onStart方法里getIntent并没有获取到MainActivity2传递的intent值；

而在MainActivity的onNewIntent里获取到MainActivity2传递的Intent值。

--------- 由此问题得到结果，在onNewIntent方法里获取Intent值，并且onNewIntent在onStart之前被调用。

-------- 当MainActivity的启动模式设置为standard时，onNewIntent未被调用。这一点要注意。

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