render my map (file PNG or JPG) on MapView make trouble

tsdt · by **tsdt** » Mon Mar 17, 2008 4:53 am

Hi friends!
I 'm rendering my map file "map.PNG"(or "map.JPG") on MapView with code:

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Using java Syntax Highlighting

 
package android.asnet.tttttt;
 
import com.google.android.maps.MapActivity;
 
import com.google.android.maps.MapController;
 
import com.google.android.maps.MapView;
 
import com.google.android.maps.Overlay;
 
import com.google.android.maps.OverlayController;
 
import com.google.android.maps.Overlay.PixelCalculator;
 
import android.app.Activity;
 
import android.content.Context;
 
import android.graphics.Bitmap;
 
import android.graphics.BitmapFactory;
 
import android.graphics.Canvas;
 
import android.graphics.Paint;
 
import android.os.Bundle;
 
public class tttttt extends MapActivity {
 
        MyOverlay myOverlay;
 
        MapController myMapController;
 
        MapView myMapView;
 
        OverlayController myOverlayController;
 
    @Override
 
    public void onCreate(Bundle icicle) {
 
        super.onCreate(icicle);
 
        myMapView=new MapView(this);
 
        setContentView(myMapView);
 
        myMapController=myMapView.getController();
 
        myOverlayController=myMapView.createOverlayController();
 
        myOverlay =new MyOverlay(this); 
 
        myOverlayController.add(myOverlay, true);
 
    }
 
    class MyOverlay extends Overlay
 
    {
 
        Bitmap myBitmap;
 
        Paint myPaint;
 
        public void onDraw(Canvas canvas, PixelCalculator calculator, boolean shadow)
 
        {
 
                super.draw(canvas,calculator,shadow);
 
                canvas.drawBitmap(myBitmap, 10, 10, myPaint);
 
        }
 
        public MyOverlay(Context context)
 
        {
 
//              giai ma hinh anh "map" dua vao Resource va giai ma Resource de coi bang Bitmap
 
                myBitmap=BitmapFactory.decodeResource(context.getResources(),R.drawable.map);
 
                myPaint=new Paint();
 
                BitmapFactory.Options opts = new BitmapFactory.Options();
 
                opts.inJustDecodeBounds = false;    // this will request the bm
 
            opts.inSampleSize = 16;             // scaled down by 16 times
 
        }
 
    }
 
}
 
Parsed in 0.037 seconds,  using GeSHi 1.0.8.4

But the screen do not show anything but blank, please help me!
Thanks!
TSDT.

render my map (file PNG or JPG) on MapView make trouble

render my map (file PNG or JPG) on MapView make trouble

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