android - GLES20RecordingCanvas drawBitmap NullPointerException -


i'm trying make ondraw execute @ regular intervals, example every 30ms. 

private canvas canvas; private final long updateinterval = 30; private long curdeadline;  @override protected void ondraw(canvas canvas) {     this.canvas = canvas;     long = system.currenttimemillis();     if (now < curdeadline) //too early, need wait     {         long delay = curdeadline - now; //e.g. start drawing 5ms later         handler.postdelayed(rundodraw, delay);     }     else         dodraw(); //execute }     private void dodraw() {     long = system.currenttimemillis();           curdeadline = now+updateinterval;      canvas.drawbitmap(bmp, 0, 0, null);     invalidate(); }  private runnable rundodraw = new runnable() {            public void run()     {         dodraw();     } };

but throws

 java.lang.nullpointerexception     @ android.view.gles20recordingcanvas.drawbitmap(gles20recordingcanvas.java:105)     @ mygame.dodraw(mygame.java:963)     @ mygame.access$1(mygame.java:945)     @ mygame$2.run(mygame.java:1007)     @ android.os.handler.handlecallback(handler.java:725)     @ android.os.handler.dispatchmessage(handler.java:92)     @ android.os.looper.loop(looper.java:175)     @ android.app.activitythread.main(activitythread.java:5279)     @ java.lang.reflect.method.invokenative(native method)     @ java.lang.reflect.method.invoke(method.java:511)     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1102)     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:869)     @ dalvik.system.nativestart.main(native method)

in source code says @ line 105

super.drawbitmap(bitmap, src, dst, paint);

it looks wrong method drawbitmap being called. android bug?


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