Drawable、Bitmap、byte[]之间的转换

android在处理一写图片资源的时候，会进行一些类型的转换:

1 Drawable → Bitmap 的简单方法 

1 ((BitmapDrawable)res.getDrawable(R.drawable.youricon)).getBitmap();

2 Drawable → Bitmap

1 public static Bitmap drawableToBitmap(Drawable drawable) {  
2           
3     Bitmap bitmap = Bitmap.createBitmap(rawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);  
4     Canvas canvas = new Canvas(bitmap);  
5     //canvas.setBitmap(bitmap);  
6     drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());  
7     drawable.draw(canvas);  
8     return bitmap;  
9 }

3 Bitmap→Drawable的简单方法

1 BitmapDrawable bitmapDrawable = (BitmapDrawable)bitmap;     
2 Drawable drawable = (Drawable)bitmapDrawable;     
3     
4 Bitmap bitmap = new Bitmap (...);     
5 Drawable drawable = new BitmapDrawable(bitmap);

4 从资源中获取Bitmap

1 Resources res = getResources();  
2 Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.pic);

5 Bitmap → byte[]

1 private byte[] Bitmap2Bytes(Bitmap bm) {  
2     ByteArrayOutputStream baos = new ByteArrayOutputStream();  
3     bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
4     return baos.toByteArray();  
5 }

6 byte[] → Bitmap

private Bitmap Bytes2Bimap(byte[] b) {  
    if (b.length!=0) {  
        return BitmapFactory.decodeByteArray(b, 0, b.length);  
    } else {  
        return null;  
    }  
}

 

posted on 2015-03-22 21:09  eustoma  阅读(259)  评论(0)  编辑  收藏  举报

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