android典型代码系列(六)------drawable图片转换为48dip的bitmap

3_drawable图片转换为48dip的bitmap :

package cn.itcast.mobilesafe.util;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.Display;
import android.view.WindowManager;

public class ImageUtil {

    /** * 返回一个宽度和高度都为48个像素的bitmap */
    public static Bitmap getResizedBitmap(BitmapDrawable drawable,
            Context context) {
        Bitmap bitmap = drawable.getBitmap();
        WindowManager manager = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        Display display = manager.getDefaultDisplay();
        int height = display.getHeight();
        int width = display.getWidth();
        if (height < 480 || width < 320) {
            return Bitmap.createScaledBitmap(bitmap, 32, 32, false);
        } else {
            return Bitmap.createScaledBitmap(bitmap, 48, 48, false);
        }
    }
}