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POSurfaceView not showing animation
 

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    <p>I want to draw an animated picture in my MainActivity My MainActivity code is as follows :</p> <pre><code>public class LaozhangActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { Ch0_1 view=new Ch0_1(this); super.onCreate(savedInstanceState); setContentView(view); } } </code></pre> <p>and I have defined a class that extends <code>SurfaceView</code> in order to show an animated picture; The code is like this: </p> <pre><code>public class Ch0_1 extends SurfaceView implements Callback, Runnable { SurfaceHolder surfaceHolder; private boolean isThreadRunning = true; Canvas canvas; float r = 10; public Ch0_1(Context context) { super(context); surfaceHolder = this.getHolder(); surfaceHolder.addCallback(this); canvas=new Canvas(); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } public void surfaceCreated(SurfaceHolder holder) { new Thread(this).start(); } public void surfaceDestroyed(SurfaceHolder holder) { } private void Method(int x,int y) { Paint pen=new Paint(); pen.setColor(Color.GREEN); canvas=surfaceHolder.lockCanvas(); canvas.drawLine(0, 0, x, y, pen); surfaceHolder.unlockCanvasAndPost(canvas); } public void run() { while (isThreadRunning) { int x=0,y=0; Method(x,y); try { Thread.sleep(100); } catch (Exception e) { e.printStackTrace(); } x+=10; y+=10; if(x&gt;400)break; } } } </code></pre> <p>When running, the MainActivity is black, it didn't show the picture.<br> Where is the problem?</p>
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    1. USjonsca
    1. USMryoun
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    1. COYou are not drawing anything in the canvas so Before starting your code you should see http://www.droidnova.com/2d-tutorial-series-part-i,770.html tutorial.
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      1. USDharmendra
    2. COYes, he actually draws a line in the `Method` method (see my answer)
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      1. USfiddler
 

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