Android之Drawable转换drawable、bitmap、byte[]
16lz
2021-01-26
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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