holder.getSurface().isValid() is returning false

Question

I am using Surfaceview to change the background image. But I am getting false on holder.getSurface().isValid() and I don't know why. I looked at some of the similar questions here, but still could not solve it. Is there something missing on what I have done so far, or is there something else I should try

Thanks

import android.content.Context; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.view.SurfaceHolder; import android.view.SurfaceView; public class BrickSmasherView extends SurfaceView { SurfaceHolder holder; Canvas canvas; Context context; Thread back = null; volatile boolean running = false; public BrickSmasherView(Context context) { super(context); this.context = context; holder = getHolder(); } public void runbackThread(){ back = new Thread(new Runnable() { @Override public void run() { while (running){ draw(); } } }); back.start(); } public void resumegame(){ running = true; runbackThread(); } public void pausegame(){ running = false; try { back.join(); } catch (InterruptedException e) { e.printStackTrace(); } } public void draw(){ if(holder.getSurface().isValid()){ canvas = holder.lockCanvas(); canvas.drawBitmap(BitmapFactory.decodeResource(getResources(),R.drawable.sky),0,0,null); holder.unlockCanvasAndPost(canvas); } } }

Tomin B Azhakathu · Accepted Answer · 2017-12-06 07:47:44Z

You had to add Callback in the SurfaceView to receive events about Surface availability and do drawing from a thread.

A Callback Example will look like this :

public class MyCallback implements SurfaceHolder.Callback { @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { // you need to start your drawing thread here } @Override public void surfaceDestroyed(SurfaceHolder holder) { // and here you need to stop it } }

And than you need to set this callback to SurfaceHolder:

surface.getHolder().addCallback(new MyCallback());

Try this please. I Think It will help you

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