Bitmap与Drawable,byte[]之间的转化

android在处理一写图片资源的时候，会进行一些类型的转换，现在有空整理一下，以便于以后随时可用

1、drawable---->bitmap

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);
return bitmap;
}

2、从资源中获取Bitmap：drawable---->bitmap

Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
//或者这种方法也行，这两种方法都一样
Bitmap bmp = ((BitmapDrawable)this.getResources.getDrawable(R.drawable.pic)).getBitmap();

3、bitmap---->drawable

/**
* Bitmap转化为drawable
* @param bitmap
* @return
*/
public static Drawable bitmap2Drawable(Bitmap bitmap){
return new BitmapDrawable(bitmap) ;
}

4、bitmap---->byte[]

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

5、byte[]---->bitmap

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

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