2011/3/22 Nicholas Johnson <[email protected]>:
> It appears, by your code, that you are drawing on the bitmap through the
> canvas. However, I'm guessing your real question is: why is my bitmap not
> being displayed on the screen? Well, that's because your bitmap or canvas is
> not associated at all with any buffers which finally get displayed on your
> device.
> Here are 2 options for you:
> 1) If you're just trying to display a picture to the screen that doesn't
> change, then just put an ImageView in your view hierarchy and define the
> "android:src="R.drawable.bg"".
> 2) If you're end goal is to do custom drawing onto the screen, then you're
> going to have to create a custom view and override the onDraw method, which
> gives you the Canvas object which is "linked" to the display.
> Remember, a Canvas is just a tool for drawing onto a bitmap. It
> has, inherently, nothing to do with drawing something to the screen.
> Nick
yes, a rewrite my test code following your 2th point. It can draw a bitmap now.
It should "linked" to the gaven canvas.
public class testCanvas extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
try{
super.onCreate(savedInstanceState);
myView myview = new myView(this);
setContentView(myview);
// setContentView(R.layout.main);
}catch(Exception e) {
e.printStackTrace();
}
}
private class myView extends View {
public myView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable draw = getResources().getDrawable(R.drawable.bg);
Bitmap bitmap =
BitmapFactory.decodeResource(this.getResources(), R.drawable.bg);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
canvas.drawColor(Color.WHITE);
// canvas.setBitmap(bitmap);
canvas.drawBitmap(bitmap, 50, 60, paint);
canvas.drawText("harvey", 160, 240, paint);
}
}
}
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