16_读取bitmap资源在canvas绘画

import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends Activity {
  

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(new RenderView(this));
    }
}

class RenderView extends View {
    Bitmap bob565;
    Bitmap bob4444;
    Rect dst = new Rect();

    public RenderView(Context context) {
        super(context);

        try {
            AssetManager assetManager = context.getAssets();
            InputStream inputStream = assetManager.open("bobrgb888.png");
            bob565 = BitmapFactory.decodeStream(inputStream);
            inputStream.close();
            Log.d("BitmapText",
                    "bobrgb888.png format: " + bob565.getConfig());

            inputStream = assetManager.open("bobargb8888.png");
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inPreferredConfig = Bitmap.Config.ARGB_4444;
            bob4444 = BitmapFactory
                    .decodeStream(inputStream, null, options);
            inputStream.close();
            Log.d("BitmapText",
                    "bobargb8888.png format: " + bob4444.getConfig());

        } catch (IOException e) {
            // silently ignored, bad coder monkey, baaad!
        } finally {
            // we should really close our input streams here.
        }
    }

    protected void onDraw(Canvas canvas) {
        dst.set(50, 50, 350, 350);
        canvas.drawBitmap(bob565, null, dst, null);
        canvas.drawBitmap(bob4444, 100, 100, null);
        invalidate();
    }
}