drawable转mitmap 以及图片base64编码
static Bitmap drawableToBitmap(Drawable drawable) // drawable 转换成bitmap { int width = drawable.getIntrinsicWidth();// 取drawable的长宽 int height = drawable.getIntrinsicHeight(); Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ?Bitmap.Config.ARGB_8888:Bitmap.Config.RGB_565;// 取drawable的颜色格式 Bitmap bitmap = Bitmap.createBitmap(width, height, config);// 建立对应bitmap Canvas canvas = new Canvas(bitmap);// 建立对应bitmap的画布 drawable.setBounds(0, 0, width, height); drawable.draw(canvas);// 把drawable内容画到画布中 return bitmap; }
调用代码,getDrawable过期了,但是还可以用,替换的方法暂未发现
Bitmap bitmap = drawableToBitmap(this.getResources().getDrawable(R.drawable.ic_launcher));
2.图片转base64
public String Bitmap2StrByBase64(Bitmap bit){ ByteArrayOutputStream bos=new ByteArrayOutputStream(); bit.compress(Bitmap.CompressFormat.JPEG, 40, bos);//参数100表示不压缩 byte[] bytes=bos.toByteArray(); return Base64.encodeToString(bytes, Base64.DEFAULT); }
1.Drawable—>Bitmap
Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.sample_0);
Resources res=getResources();
private byte[] Bitmap2Bytes(Bitmap bm){
2.Bitmap---->Drawable
Drawable drawable =new BitmapDrawable(bmp);
3、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;
}
4、从资源中获取Bitmap
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
5、Bitmap → byte[]
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray(); }
6、 byte[] → Bitmap
private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=0){
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
else {
return null;
}
}