android—Drawable、Bitmap、byte[]…

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1、Drawable → Bitmap 的简单方法
((BitmapDrawable)res.getDrawable(R.drawable.youricon)).getBitmap();

2、Drawable → Bitmap
Java代码
public static Bitmap drawableToBitmap(Drawable drawable){

     Bitmap bitmap= Bitmap
               .createBitmap(
                         drawable.getIntrinsicWidth(),
                         drawable.getIntrinsicHeight(),
                         drawable.getOpacity() != PixelFormat.OPAQUE ?Bitmap.Config.ARGB_8888
                                     :Bitmap.Config.RGB_565);
     Canvas canvas= new Canvas(bitmap);
     //canvas.setBitmap(bitmap);
     drawable.setBounds(0,0, drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
     drawable.draw(canvas);
     returnbitmap;
}

3.Bitmap→Drawable 的简单方法
BitmapDrawable bitmapDrawable =(BitmapDrawable)bitmap;
Drawable drawable = (Drawable)bitmapDrawable;

Bitmap bitmap = new Bitmap (...);
Drawable drawable = new BitmapDrawable(bitmap);

3、从资源中获取Bitmap
Java代码
Resourcesres=getResources();

Bitmap bmp=BitmapFactory.decodeResource(res,R.drawable.pic);

4、Bitmap → byte[]
Java代码
private byte[] Bitmap2Bytes(Bitmapbm){
ByteArrayOutputStream baos =newByteArrayOutputStream(); 
bm.compress(Bitmap.CompressFormat.PNG, 100,baos); 
returnbaos.toByteArray();
}

5、 byte[] → Bitmap
Java代码
（方法一）private Bitmap Bytes2Bimap(byte[]b){
       if(b.length!=0){
         returnBitmapFactory.decodeByteArray(b, 0,b.length);
       }
       else{
         returnnull;
       }
   }
（方法二）
          byte[] smByte =cursor.getBlob(cursor.getColumnIndex("codeImg"));
         ByteArrayInputStream is = new ByteArrayInputStream(smByte);
          bitmap = newBitmapDrawable(is).getBitmap();

引用地址：http://zhangkun716717-126-com.iteye.com/blog/1147957  ；

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