Application error when drawing to SurfaceView
- by DKDiveDude
I'm am doing a simple coding attempt trying to draw on a SurfaceView created on my main.xml layout. I can change background color and display an icon fine, but when I try to draw I get an error. I am a newbie so obvious I am missing something, please lent a helping hint, thanks!
main.xml
<?xml version="1.0" encoding="utf-8"?>
<SurfaceView android:id="@+id/Paper"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
</SurfaceView>
and code here;
package com.example.SurfaceViewTest;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class SurfaceViewTest extends Activity implements SurfaceHolder.Callback {
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Paint paint;
private Canvas canvas;
Bitmap mDrawing;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSurfaceView = (SurfaceView) this.findViewById(R.id.Paper);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mSurfaceView.setBackgroundColor(Color.rgb(0, 255, 0));
//mSurfaceView.setBackgroundResource(R.drawable.icon);
canvas = holder.lockCanvas(null);
mDrawing = Bitmap.createBitmap(100, 100, Bitmap.Config.RGB_565);
canvas.setBitmap(mDrawing);
paint = new Paint();
paint.setColor(Color.rgb(255, 255,255));
canvas.drawLine(1,1,200,300, paint);
holder.unlockCanvasAndPost(canvas);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
