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

1、Drawable → Bitmap

Java代码

publicstaticBitmapdrawableToBitmap(Drawabledrawable){
Bitmapbitmap=Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
:Bitmap.Config.RGB_565);
Canvascanvas=newCanvas(bitmap);
//canvas.setBitmap(bitmap);
drawable.setBounds(0,0,drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
drawable.draw(canvas);
returnbitmap;
}

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

Java代码

Resourcesres=getResources();
Bitmapbmp=BitmapFactory.decodeResource(res,R.drawable.pic);

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

3、Bitmap → byte[]

Java代码

privatebyte[]Bitmap2Bytes(Bitmapbm){
ByteArrayOutputStreambaos=newByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG,100,baos);
returnbaos.toByteArray();
}

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

4、 byte[] → Bitmap

Java代码

privateBitmapBytes2Bimap(byte[]b){
if(b.length!=0){
returnBitmapFactory.decodeByteArray(b,0,b.length);
}
else{
returnnull;
}
}

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

以上是我在实践中遇到的一些转换，以后遇到类似的就不用到处找了，希望对大家也有一点用处！

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