android - 屏幕锁定和解锁

Question

我想知道当用户在 android 中锁定手机时屏幕是关闭的。我像这样使用 BroadCast 接收器并注册了但我不知道屏幕是否关闭

public class MyActivity extends Activity{   

    private static final String ACTION = "android.intent.action.ACTION_SCREEN_OFF";
    BroadcastReceiver myReceiver;
    Context context;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        context = this;
        final IntentFilter theFilter = new IntentFilter();
        theFilter.addAction(ACTION);

        context.registerReceiver(myReceiver, theFilter);
        System.out.println("inside increate");
        myReceiver = new BroadcastReceiver(){

            @Override
            public void onReceive(Context context, Intent intent) {
                // TODO Auto-generated method stub      
                    System.out.println("phone locked*****");                
            }

        };   

    }}

如何找出这个问题？

Answer 1

第 1 步:删除 private static final String ACTION 行

第 2 步:在 addAction() 行中使用 Intent.ACTION_SCREEN_OFF(或者，更好的是，将其提供给 IntentFilter构造函数并去掉 addAction() 行)

第 3 步:使用 android.util.Log 代替 System.out.println()