Android中自定义View的研究 -- 获得Bitmap的三种方法

  • 使用BitmapFactory解析图片
// --> 使用BitmapFactory解析图片
 
           public voidmyUseBitmapFactory(Canvas canvas){
 
           // 定义画笔
 
              Paint paint = newPaint();
 
           // 获取资源流
 
              Resources rec = getResources();
 
              InputStream in = rec.openRawResource(R.drawable.haha);
 
           // 设置图片
 
              Bitmap bitmap =BitmapFactory.decodeStream(in);
 
           // 绘制图片
 
              canvas.drawBitmap(bitmap, 0,20, paint);          
           }
  • 使用BitmapDrawable解析图片

 ``` // --> 使用BitmapDrawable解析图片       public voidmyUseBitmapDrawable(Canvas canvas){       // 定义画笔          Paint paint = newPaint();       // 获得资源          Resources rec = getResources();       // BitmapDrawable          BitmapDrawable bitmapDrawable = (BitmapDrawable) rec.getDrawable(R.drawable.haha);       // 得到Bitmap          Bitmap bitmap = bitmapDrawable.getBitmap();       // 在画板上绘制图片          canvas.drawBitmap(bitmap, 20,120,paint);     }


*   使用InputStream和BitmapDrawable绘制
    

// --> 使用InputStream和BitmapDrawable解析图片            public voidmyUseInputStreamandBitmapDrawable(Canvas canvas){            // 定义画笔               Paint paint = newPaint();            // 获得资源               Resources rec = getResources();            // InputStream得到资源流               InputStream in = rec.openRawResource(R.drawable.haha);            // BitmapDrawable 解析数据流               BitmapDrawable bitmapDrawable =  newBitmapDrawable(in);            // 得到图片               Bitmap bitmap = bitmapDrawable.getBitmap();            // 绘制图片               canvas.drawBitmap(bitmap, 100, 100,paint);          }


  

      ![](https://img.paonet.com/upload-images-old/uploads/allimg/130306/235P5M53-0.png)