Android 通过广播监听home键和任务键

通过继承BroadcastReceiver来判断触发的按键，代码如下

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private MyBroadcastReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        receiver = new MyBroadcastReceiver();
        IntentFilter filter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        registerReceiver(receiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);
    }

    class MyBroadcastReceiver extends BroadcastReceiver {

        private static final String KEY_HOME = "homekey";
        private static final String KEY_RECENT = "recentapps";

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent != null) {
                String reason = intent.getStringExtra("reason");
                if (KEY_HOME.equals(reason)) {
                    Log.i(TAG, "home键触发");
                }
                if (KEY_RECENT.equals(reason)) {
                    Log.i(TAG, "任务键触发");
                }
            }
        }
    }
}

运行代码后，点击home和任务键，可以看到日志打印如下