面试例题6：两种方法将图像显示在View上

题目来自：《android高薪之路—android程序员面试宝典》一书  ，只是为了个人学习方便

题目：在android工程的res/drawable目录中有一个android.png图像文件，如何将该图像显示在View上

直接代码：

 

package com.app;

import java.io.InputStream;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.view.View;

public class GetBitmapView extends View{

       public GetBitmapView(Context context) {
             super(context);
      }

       @Override
       protected void onDraw(Canvas canvas) {
             super.onDraw(canvas);
            Paint paint = new Paint();
            InputStream is = getResources().openRawResource(R.drawable.android);
            Options opts = new Options();
            opts. inSampleSize=2;
            Bitmap bitmap = BitmapFactory. decodeStream(is, null, opts);
            canvas.drawBitmap(bitmap, 10, 10, paint);

            Drawable drawable = getResources().getDrawable(R.drawable.android);
            drawable.setBounds(50, 350, 180, 420);
            drawable.setAlpha(100);
            drawable.draw(canvas);
      }
}

 

转载于:https://blog.51cto.com/3599672/941098