在 Android 中创建屏幕保护程序

Question

是否可以为Android（不是锁屏）编写屏幕保护程序？

我正在寻找有关屏幕保护程序编程的教程。当用户不执行任何操作时，屏幕保护程序将激活。如果用户触摸屏幕，屏幕保护程序就会消失。这可能吗？

Answer 1

您可以使用 BroadcastReceiver 在您的应用中接收 ACTION_SCREEN_OFF。在此 BroadcastReceiver 的 onReceive 方法中，启动一个 Activity 作为屏幕保护程序< /code>。您可以为触摸事件注册一个侦听器，当此事件发生时，完成您的应用程序。

Answer 2

我给出了屏幕保护程序的摘录：评论会解释它。

requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
点 res=new Point(); getWindowManager().getDefaultDisplay().getSize(res);

        DotsView myView = new DotsView(this,res.x,res.y);
        setContentView(myView);
    }


class DotsView extends View 
{
        int i = 0;Bitmap bmp;Canvas cnv;Rect bounds;Paint p;Random rnd;int width,height;

        public DotsView(Context context ,int width ,int height) 
    {
            super(context);
            this.width = width;
            this.height = height;
            bmp = Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
        cnv = new Canvas(bmp);
            bounds = new Rect(0 , 0, width,height);
        p = new Paint();
            rnd = new Random();

        p.setColor(Color.RED);
        p.setStyle(Paint.Style.FILL_AND_STROKE);
        p.setDither(false);
        p.setStrokeWidth(3);
        p.setAntiAlias(true);
        p.setColor(Color.parseColor("#CD5C5C"));
        p.setStrokeWidth(15);
        p.setStrokeJoin(Paint.Join.ROUND);
        p.setStrokeCap(Paint.Cap.ROUND);
     }

     @Override
         protected void onDraw(Canvas c) 
    {//Canvas c gets recycled , so drawing on it will keep erasing previous causing animation...we dont want that.
            p.setColor(Color.argb(255, rnd.nextInt(255),rnd.nextInt(255), rnd.nextInt(255)));
    //cnv is outside object canvas, so drawing on it will append, no recycle, we want that.
            cnv.drawPoint(rnd.nextInt(width), rnd.nextInt(height), p); 
    //drawing on cnv canvas, draws on bitmap bmp
        //c.drawBitmap(bmp,src_rect,dest_rect,paint):-
    // crop as per src_rect(null means full), and scale to dest_rect, draw using paint object-null for 'as it is'.  
        c.drawBitmap(bmp, null, bounds , null);
    //make onDraw() recursive but dont make blocking-loop & not indefinite condition
        if(i<1000) {  i++;invalidate();  } 

要查看完整代码，请参阅此处：- 代码示例-屏幕保护程序-彩色点

Answer 3

Android 屏幕保护程序示例代码

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