SurfaceView显示黑屏 - Android电子 [英] SurfaceView shows black screen - Android

问题描述

基本上我想使用SurfaceView动画。因此，该类实现Runnable。做实验，我想画一个圆。然而，只显示黑屏。

我一直在尝试了好几天。真的AP preciate，如果有人可以提供帮助。

MainActivity类别

 公共类MainActivity延伸活动{私人位图液体;@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    requestWindowFeature（Window.FEATURE_NO_TITLE）;
    getWindow（）。setFlags（WindowManager.LayoutParams.FLAG_FULLSCREEN，
            WindowManager.LayoutParams.FLAG_FULLSCREEN）;    DrawStripFrame D1 =新DrawStripFrame（本）;
    的setContentView（D1）;
 

DrawStripFrame类

 公共类DrawStripFrame扩展SurfaceView实现Runnable {私人SurfaceHolder持有人;
私人布尔运行= TRUE;公共DrawStripFrame（上下文的背景下）{
    超级（上下文）;
    支架= getHolder（）;
}@覆盖
公共无效的run（）{        而（运行）{
            如果（holder.getSurface（）。的isValid（））{
                帆布C = holder.lockCanvas（）;
                c.drawARGB（0，0，0，0）;
                涂料redPaint =新的油漆（）;
                redPaint.setColor（Color.RED）;
                c.drawCircle（100，100，30，redPaint）;
                holder.unlockCanvasAndPost（C）;
            }        }
    }
}
 

解决方案

问题是通过改变while循环是这样解决的：

 而（运行）{
            如果（！holder.getSurface（）。isValid（）的）
                继续;            帆布C = holder.lockCanvas（）;
            c.drawARGB（0，0，0，0）;
            涂料redPaint =新的油漆（）;
            redPaint.setColor（Color.RED）;
            c.drawCircle（100，100，30，redPaint）;
            holder.unlockCanvasAndPost（C）;
    }
 

continue语句发送控制回到循环的顶部时，表面是无效的。只有当表面是有效的，该块下面将被执行。

Basically I want to use SurfaceView for animation. Therefore the class implements Runnable. To experiment, I want to draw a circle. However, it shows only a black screen.

I have been trying for days. Really appreciate if someone can help.

MainActivity class

public class MainActivity extends Activity {

private Bitmap Liquid;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature (Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    DrawStripFrame D1 = new DrawStripFrame(this);
    setContentView(D1);

DrawStripFrame class

public class DrawStripFrame extends SurfaceView implements Runnable{

private SurfaceHolder holder;
private boolean running = true;

public DrawStripFrame (Context context){
    super (context);
    holder = getHolder();
}

@Override
public void run(){

        while(running){         
            if(holder.getSurface().isValid()){
                Canvas c = holder.lockCanvas();
                c.drawARGB(0, 0, 0, 0);
                Paint redPaint = new Paint();
                redPaint.setColor(Color.RED);
                c.drawCircle(100, 100, 30, redPaint);
                holder.unlockCanvasAndPost(c);
            }

        }
    }
}

解决方案

The problem is solved by changing the while loop like this:

while(running){         
            if(!holder.getSurface().isValid())
                continue;

            Canvas c = holder.lockCanvas();
            c.drawARGB(0, 0, 0, 0);
            Paint redPaint = new Paint();
            redPaint.setColor(Color.RED);
            c.drawCircle(100, 100, 30, redPaint);
            holder.unlockCanvasAndPost(c);
    }

The continue statement sends control back to the top of the loop when surface is invalid. Only when surface is valid, the block below will be executed.

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