Drawable之图片转换drawable、bitmap、byte[]

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在代码中我们有时需要获取res下的资源文件，

尤其是Drawable的图片文件并转换bitmap，或者相互转换

Drawable 转 Bitmap

方法一：

Drawable drawable = getResources().getDrawable(R.drawable.icon);imageview.setBackground(drawable);

方法二：

Inputstream is = getResources().openRawResource(R.drawable.icon);BitmapDrawable mapDraw = new BitmapDrawable(is);Bitmap bitmap = mapDraw.getBitmap();

InputStream is = getResources().openRawResource(R.drawable.icon);  Bitmap bitmap = BitmapFactory.decodeStream(is);

方法三：

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);Bitmap iconBitmap = bitmap.createBitmap( 300, 300, Config.ARGB_8888 );

方法四：

public 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);     drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());     drawable.draw(canvas);     return bitmap;}

Bitmap 转 Drawable

Drawable drawable =new BitmapDrawable(bitmap);

Bitmap 转 byte[ ]

public static byte[] getBytes(Bitmap bitmap){     ByteArrayOutputStream baos = new ByteArrayOutputStream();     bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);     return baos.toByteArray();   }

byte[] 转 Bitmap

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

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