public class AsynDownLoagPic extends AsyncTask<String, Void, Bitmap> {
    URL url = null;
Context mContext;
    public AsynDownLoagPic(Context context) {
        mContext = context;
}

    @Override
protected void onPreExecute() {
        super.onPreExecute();
}

    @Override
protected Bitmap doInBackground
 
(String... params) {
        //根據url路徑，將圖片儲存到本地
InputStream inputStream = null;
HttpURLConnection urlConnection = null;
Bitmap bmp = null;
        try {
            url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setConnectTimeout(10000
 
);
inputStream = urlConnection.getInputStream();
            byte[] bt = getBytesFromStream(inputStream);
LogUtils.e("bitmapCahche--->轉換成bitmap物件------");
bmp = BitmapFactory.decodeByteArray(bt, 0, bt.length);
} catch (MalformedURLException e) {
            e.printStackTrace();
            return null;
 
} catch (IOException e) {
            e.printStackTrace();
            return null;
} finally {
            if (null != inputStream) {
                try {
                    inputStream.close();
inputStream = null;
} catch (IOException e) {
                    e.printStackTrace();
}
            }
            if (null != urlConnection) {
                urlConnection.disconnect();
urlConnection = null;
}
        }
        return bmp;
}




    @Override
protected void onPostExecute(Bitmap bitmap) {
        //將圖片儲存到本地
//       saveMyBitmap((url.toString()), bitmap);
saveImageToGallery(mContext,bitmap);
}

//根據位元組流儲存圖片

private byte[] getBytesFromStream(InputStream inputStream) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    byte[] buf = new byte[1024 * 10];
    int len = 0;
    while (len != -1) {
        try {
            len = inputStream.read(buf);
            if (len != -1) {
                baos.write(buf, 0, len);
//    baos.flush();
              //  LogUtils.e("bitmapCahche*-*-*-正在寫入圖片------" + buf.length);
}
        } catch (IOException e) {
            e.printStackTrace();
LogUtils.e("bitmapCahche*-*-*-寫入出錯------" + e.toString());
len = -1;
}
    }
    if (inputStream != null) {
        try {
            inputStream.close();
} catch (IOException e) {
            e.printStackTrace();
}
    }
    LogUtils.e("bitmapCahche*-*-*-圖片寫入完畢------");
    return baos.toByteArray();
}

//將圖片儲存到本地相簿

  public void saveImageToGallery(Context context, Bitmap bmp) {
        File appDir = new File("/mnt/sdcard/Diction", "");
        if (!appDir.exists()) {
            appDir.mkdir();
}
        String fileName = System.currentTimeMillis() + ".jpg";
File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
//            toast("儲存成功");
ToastUtils.showShort(mContext,"儲存成功。");
} catch (FileNotFoundException e) {
//            toast("儲存失敗");
ToastUtils.showShort(mContext,"儲存失敗。");
e.printStackTrace();
} catch (IOException e) {
//            toast("儲存失敗");
ToastUtils.showShort(mContext,"儲存失敗。");
e.printStackTrace();
}

        try {
            MediaStore.Images.Media.insertImage(context.getContentResolver(),
file.getAbsolutePath(), fileName, null);
} catch (FileNotFoundException e) {
            e.printStackTrace();
}

        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file)));
}