获取bitmap的四种方法

一、使用BitmapFactory解析图片

// --> 使用BitmapFactory解析图片

           publicvoid myUseBitmapFactory(Canvas canvas){

           //定义画笔

              Paint paint = new Paint();

           //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);         

           }

二、使用BitmapDrawable解析图片

 

 

       // -->使用BitmapDrawable解析图片

           publicvoid myUseBitmapDrawable(Canvas canvas){

           //定义画笔

              Paint paint = new Paint();

           //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);

           }

 

三、使用InputStream和BitmapDrawable绘制

 

       // -->使用InputStream和BitmapDrawable解析图片

           publicvoid myUseInputStreamandBitmapDrawable(Canvas canvas){

           //定义画笔

              Paint paint = new Paint();

           //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 = new BitmapDrawable(in);

           //得到图片

              Bitmap bitmap = bitmapDrawable.getBitmap();

           //绘制图片

              canvas.drawBitmap(bitmap, 100, 100,paint);

           }

四    Bitmap bitmap = BitmapFactory.decodeResource(getResources()， R.drawable.icon1);