Question

我有一个应用程序，它将从服务器接收消息并向用户发出一个对话框。所以当手机在锁定屏幕上时，我希望对话框将显示在锁定屏幕的顶部但不解锁它。是否有人给我建议？

Answer 1

public void onAttachedToWindow() {
      Window window = getWindow();
      window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
           | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
           | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
           | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
}

Answer 2

我用以下方式解决了类似问题。创建服务，广播动作＆＃34; ACTION_SCREEN_ON＆amp; ACTION_USER_PRESENT＆amp; ACTION_SCREEN_OFF＆＃34;，创建用WINDOW_SERVICE显示窗口的函数。我根据我的要求使用服务，但它可以适应。

public class OverlayService extends Service {

    private static final String TAG = OverlayService.class.getSimpleName();
    WindowManager mWindowManager;
    View mView;
    Animation mAnimation;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        registerOverlayReceiver();
        return super.onStartCommand(intent, flags, startId);
    }

    private void showDialog(String aTitle){
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        mView = View.inflate(getApplicationContext(), R.layout.fragment_overlay, null);
        mView.setTag(TAG);

        int top = getApplicationContext().getResources().getDisplayMetrics().heightPixels / 2;

        RelativeLayout dialog = (RelativeLayout) mView.findViewById(R.id.dialog);
        LayoutParams lp = (LayoutParams) dialog.getLayoutParams();
        lp.topMargin = top;
        lp.bottomMargin = top;
        mView.setLayoutParams(lp);

        ImageButton imageButton = (ImageButton) mView.findViewById(R.id.close);
        lp = (LayoutParams) imageButton.getLayoutParams();
        lp.topMargin = top - 58;
        imageButton.setLayoutParams(lp);
        imageButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mView.setVisibility(View.INVISIBLE);
            }
        });

        TextView title = (TextView) mView.findViewById(R.id.Title);
        title.setText(aTitle);

        final WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
        ViewGroup.LayoutParams.MATCH_PARENT,
        ViewGroup.LayoutParams.MATCH_PARENT, 0, 0,
        WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON ,
        PixelFormat.RGBA_8888);

        mView.setVisibility(View.VISIBLE);
        mAnimation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.in);
        mView.startAnimation(mAnimation);
        mWindowManager.addView(mView, mLayoutParams);

    }

    private void hideDialog(){
        if(mView != null && mWindowManager != null){
            mWindowManager.removeView(mView);
            mView = null;
        }
    }

    @Override
    public void onDestroy() {
        unregisterOverlayReceiver();
        super.onDestroy();
    }

    private void registerOverlayReceiver() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        registerReceiver(overlayReceiver, filter);
    }

    private void unregisterOverlayReceiver() {
        hideDialog();
        unregisterReceiver(overlayReceiver);
    }


    private BroadcastReceiver overlayReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            Log.d(TAG, "[onReceive]" + action);
            if (action.equals(Intent.ACTION_SCREEN_ON)) {
                showDialog("Esto es una prueba y se levanto desde");
            }
            else if (action.equals(Intent.ACTION_USER_PRESENT)) {
                hideDialog();
            }
            else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
                hideDialog();
            }
        }
    };
}

我希望它有用！

Answer 3

最后我实现了同样的目标。不要去活动，因为安全原因，android不会在你的活动后面显示锁屏，所以使用服务而不是Activity。

以下是我服务的onStartCommand中的代码

WindowManager mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

View mView = mInflater.inflate(R.layout.score, null);

WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
        | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
        | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
/* | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON */,
PixelFormat.RGBA_8888);

mWindowManager.addView(mView, mLayoutParams);

将<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />添加到清单

Android：如何通过锁定屏幕显示对话框或活动[未解锁屏幕]

3 个答案: