圖片過大，大於1M的情況下上傳伺服器會很耗時，因此要實現壓縮上傳並且不失真

String mCurrentPhotoPath;

Intent openCameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

// 指定存放拍攝照片的位置
File f = createImageFile();
openCameraIntent
        .putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(openCameraIntent, REQUEST_TAKE_PHOTO
 
);

private File createImageFile()  {
    SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd_HHmmss");
    String timeStamp = format.format(new Date());
    String imageFileName = "pic_" + timeStamp + ".jpg";
    File appDir = new File(Environment.getExternalStorageDirectory(), "qx");
    if 
 
(!appDir.exists()) {
        appDir.mkdir();
    }
    File image = new File(appDir, imageFileName);
    mCurrentPhotoPath = image.getAbsolutePath();
    return image;
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {case  REQUEST_TAKE_PHOTO
 
:
                if (resultCode == Activity.RESULT_OK) {
             // 新增到相簿,通知更新
galleryAddPic(this, mCurrentPhotoPath);
                    //   ByteArrayOutputStream baos = new ByteArrayOutputStream();
cardIv.setImageBitmap(
                            getSmallBitmap(mCurrentPhotoPath));

                }
                break;         

        }
    }

public static Bitmap getSmallBitmap(String filePath) {
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(filePath, options);

    // Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, 480, 800);
    // Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
    return BitmapFactory.decodeFile(filePath, options);
}

public static int calculateInSampleSize(BitmapFactory.Options options,
                                        int reqWidth, int reqHeight) {
    // Raw height and width of image
final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        // Calculate ratios of height and width to requested height and
        // width
final int heightRatio = Math.round((float) height
                / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);

        // Choose the smallest ratio as inSampleSize value, this will
        // guarantee
        // a final image with both dimensions larger than or equal to the
        // requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

public static void galleryAddPic(Context context, String path) {
    Intent mediaScanIntent = new Intent(
            Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    File f = new File(path);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    context.sendBroadcast(mediaScanIntent);
}

如果顯示類似於頭像，朋友圈顯示的小圖片等實現壓縮到幾十k以下上傳，如果展示圖片大一點並且後臺檢視保持清晰時可實現壓縮到幾百k以下上傳

map.put(KeyConstants.Image, getcomImageBase64(getSmallBitmap(mCurrentPhotoPath)));

//壓縮成100k以下上傳

public static String getcomImageBase64(Bitmap bitmap) {

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 100是壓縮率不壓縮，如果是30就是壓縮70%，壓縮後的存放在baos中
int options = 100;
    while (baos.toByteArray().length / 1024 > 100) { // 迴圈判斷如果壓縮後圖片是否大於100kb,大於繼續壓縮
baos.reset();// 重置baos即清空baos
options -= 10;// 每次都減少10
bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos);// 這裡壓縮options%，把壓縮後的資料存放到baos中
}
    byte[] bytes = baos.toByteArray();
    try {
        baos.flush();
        baos.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
e.printStackTrace();
    }
    return Base64.encodeToString(bytes, Base64.DEFAULT);

}

原文地址：http://www.360doc.com/content/14/0428/17/11800748_372972179.shtml