本文转载于
http://blog.csdn.net/u013096866/article/details/44516163
http://blog.csdn.net/csh159/article/details/8835477
http://blog.csdn.net/hezhipin610039/article/details/7899248/
1、获取资源文件 r.drawable中的图片转换为drawable、bitmap的4种方法
下面代码来源于:http://blog.csdn.net/u013096866/article/details/44516163
1)、
Resources resources = mContext.getResources();
Drawable drawable = resources.getDrawable(R.drawable.a);
2)、
Resources r = this.getContext().getResources();
Inputstream is = r.openRawResource(R.drawable.my_background_image);
BitmapDrawable bmpDraw = new BitmapDrawable(is);
Bitmap bmp = bmpDraw.getBitmap();
3)、
Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon);
Bitmap newb = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );
4)、
InputStream is = getResources().openRawResource(R.drawable.icon);
Bitmap mBitmap = BitmapFactory.decodeStream(is);
2、Bitmap与string的互转
下面代码来源于:http://blog.csdn.net/csh159/article/details/8835477
/**
* 图片转成string
*
* @param bitmap
* @return
*/
public static String convertIconToString(Bitmap bitmap)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();// outputstream
bitmap.compress(CompressFormat.PNG, 100, baos);
byte[] appicon = baos.toByteArray();// 转为byte数组
return Base64.encodeToString(appicon, Base64.DEFAULT);
}
/**
* string转成bitmap
*
* @param st
*/
public static Bitmap convertStringToIcon(String st)
{
// OutputStream out;
Bitmap bitmap = null;
try
{
// out = new FileOutputStream("/sdcard/aa.jpg");
byte[] bitmapArray;
bitmapArray = Base64.decode(st, Base64.DEFAULT);
bitmap =
BitmapFactory.decodeByteArray(bitmapArray, 0,
bitmapArray.length);
// bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
return bitmap;
}
catch (Exception e)
{
return null;
}
}
3、 Bitmap和Drawable相互转换的方法
下面代码来源于:http://blog.csdn.net/hezhipin610039/article/details/7899248/
1)、Bitmap—->Drawable
Drawable drawable =new BitmapDrawable(bmp);
2)、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;
}
3)、Bitmap → byte[]
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
baos.toByteArray();
4)、 byte[] → Bitmap
private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=0){
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
else {
return null;
}
}