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inputStream is=xxxx;
BitmapDrawable bmpDraw=new BitmapDrawable(is);
Bitmap bmp=bmpDraw.getBitmap();
Drawable →Bitmap
Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon);
Bitmap newb = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );
Canvas canvasTemp = new Canvas( newb );
canvasTemp.drawBitmap(bmp, 50, 50, p);
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、
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
Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
3、Bitmap → byte[]
private byte[] Bitmap2Bytes(Bitmap bm){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
4、 byte[] → Bitmap
private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=0){
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
else {
return null;
}
}
//将assets文件中资源取出,并将图片从bitmap转换成drawable格式
public static Drawable getDrawableFromAssetFile(Context context,String fileName){
Bitmap image = null;
BitmapDrawable drawable=null;
try{
AssetManager am = context.getAssets();
InputStream is = am.open(fileName);
image = BitmapFactory.decodeStream(is);
drawable= new BitmapDrawable(context.getResources(), image);
is.close();
}catch(Exception e){
}
return drawable;
}
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!
- May 27 Wed 2015 12:57
android BitMap、Drawable、inputStream及byte[] 互转
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