android4.4从系统图库无法加载图片的问题

典型的使用场景就是要设置一个头像，头像需要从系统图库或者拍照获得，在android4.4之前，我用的代码没问题，但是今天使用android4.4的时候突然发现不灵了。baidu了一圈，终于解决了。
下面是解决方案：

private String[] items = new String[] { "图库","拍照" };/* 头像名称 */private static final String IMAGE_FILE_NAME = "face.jpg";/* 请求码 */private static final int IMAGE_REQUEST_CODE = 0;private static final int SELECT_PIC_KITKAT = 3;private static final int CAMERA_REQUEST_CODE = 1;private static final int RESULT_REQUEST_CODE = 2;private void showSettingFaceDialog() {new AlertDialog.Builder(this).setTitle("图片来源").setCancelable(true).setItems(items, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {switch (which) {case 0:// Local Image Intent intent=new Intent(Intent.ACTION_GET_CONTENT); intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("image/*");if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {startActivityForResult(intent,SELECT_PIC_KITKAT);} else {startActivityForResult(intent,IMAGE_REQUEST_CODE);}break;case 1:// Take PictureIntent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 判断存储卡是否可以用，可用进行存储if (hasSdcard()) {intentFromCapture.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME)));}startActivityForResult(intentFromCapture,CAMERA_REQUEST_CODE);break;}}}).setNegativeButton("取消",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {dialog.dismiss();}}).show();}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// 结果码不等于取消时候if (resultCode != RESULT_CANCELED) {switch (requestCode) {case IMAGE_REQUEST_CODE:startPhotoZoom(data.getData());break;case SELECT_PIC_KITKAT:startPhotoZoom(data.getData());break;case CAMERA_REQUEST_CODE:if (hasSdcard()) {File tempFile = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);startPhotoZoom(Uri.fromFile(tempFile));} else {ToastUtils.showShort(context,"未找到存储卡，无法存储照片！");}break;case RESULT_REQUEST_CODE:if (data != null) {setImageToView(data,iv_face);}break;}}super.onActivityResult(requestCode, resultCode, data);}/** * 裁剪图片方法实现 *  * @param uri */public void startPhotoZoom(Uri uri) {if (uri == null) {Log.i("tag", "The uri is not exist.");return;}Intent intent = new Intent("com.android.camera.action.CROP");if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {String url=getPath(context,uri);intent.setDataAndType(Uri.fromFile(new File(url)), "image/*");}else{intent.setDataAndType(uri, "image/*");}// 设置裁剪intent.putExtra("crop", "true");// aspectX aspectY 是宽高的比例intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);// outputX outputY 是裁剪图片宽高intent.putExtra("outputX", 200);intent.putExtra("outputY", 200);intent.putExtra("return-data", true);startActivityForResult(intent, RESULT_REQUEST_CODE);}/** * 保存裁剪之后的图片数据 *  * @param picdata */private void setImageToView(Intent data,ImageView imageView) {Bundle extras = data.getExtras();if (extras != null) {Bitmap photo = extras.getParcelable("data");Bitmap roundBitmap=ImageUtil.toRoundBitmap(photo);imageView.setImageBitmap(roundBitmap);saveBitmap(photo);}}public void saveBitmap(Bitmap mBitmap) {File f = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);try {f.createNewFile();FileOutputStream fOut = null;fOut = new FileOutputStream(f);mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);fOut.flush();fOut.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//以下是关键，原本uri返回的是file:///...来着的，android4.4返回的是content:///...@SuppressLint("NewApi")public static String getPath(final Context context, final Uri uri) {    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;    // DocumentProvider    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {        // ExternalStorageProvider        if (isExternalStorageDocument(uri)) {            final String docId = DocumentsContract.getDocumentId(uri);            final String[] split = docId.split(":");            final String type = split[0];            if ("primary".equalsIgnoreCase(type)) {                return Environment.getExternalStorageDirectory() + "/" + split[1];            }        }        // DownloadsProvider        else if (isDownloadsDocument(uri)) {            final String id = DocumentsContract.getDocumentId(uri);            final Uri contentUri = ContentUris.withAppendedId(                    Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));            return getDataColumn(context, contentUri, null, null);        }        // MediaProvider        else if (isMediaDocument(uri)) {            final String docId = DocumentsContract.getDocumentId(uri);            final String[] split = docId.split(":");            final String type = split[0];            Uri contentUri = null;            if ("image".equals(type)) {                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;            } else if ("video".equals(type)) {                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;            } else if ("audio".equals(type)) {                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;            }            final String selection = "_id=?";            final String[] selectionArgs = new String[] {                    split[1]            };            return getDataColumn(context, contentUri, selection, selectionArgs);        }    }    // MediaStore (and general)    else if ("content".equalsIgnoreCase(uri.getScheme())) {        // Return the remote address        if (isGooglePhotosUri(uri))            return uri.getLastPathSegment();        return getDataColumn(context, uri, null, null);    }    // File    else if ("file".equalsIgnoreCase(uri.getScheme())) {        return uri.getPath();    }    return null;}/** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @param selection (Optional) Filter used in the query. * @param selectionArgs (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */public static String getDataColumn(Context context, Uri uri, String selection,        String[] selectionArgs) {    Cursor cursor = null;    final String column = "_data";    final String[] projection = {            column    };    try {        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,                null);        if (cursor != null && cursor.moveToFirst()) {            final int index = cursor.getColumnIndexOrThrow(column);            return cursor.getString(index);        }    } finally {        if (cursor != null)            cursor.close();    }    return null;}/** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */public static boolean isExternalStorageDocument(Uri uri) {    return "com.android.externalstorage.documents".equals(uri.getAuthority());}/** * @param uri The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */public static boolean isDownloadsDocument(Uri uri) {    return "com.android.providers.downloads.documents".equals(uri.getAuthority());}/** * @param uri The Uri to check. * @return Whether the Uri authority is MediaProvider. */public static boolean isMediaDocument(Uri uri) {    return "com.android.providers.media.documents".equals(uri.getAuthority());}/** * @param uri The Uri to check. * @return Whether the Uri authority is Google Photos. */public static boolean isGooglePhotosUri(Uri uri) {    return "com.google.android.apps.photos.content".equals(uri.getAuthority());}

最后只需要在需要的地方调用showSettingFaceDialog()就可以了。

如果要获得剪裁的图片保存路径，然后上传，我这边是这样处理的（这里每个人的写法不一样）：
但只要获得filePath就可以根据自己的需求处理了

private void uploadFace(){    File file = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);String filePath=file.getAbsolutePath();Log.i("tag", "filePath="+filePath);HttpHelper.uploadFileWithConcatUrl(context,HttpHelper.UPDATE_USER_ICON,App.user.getUser_session_key() ,filePath ,new HttpHelper.OnFileUploadListener(){@Overridepublic void onFileUploadSuccess(String orignUrl, String midImgUrl,String smallImgUrl) {// TODO Auto-generated method stubApp.user.setHead_icon(orignUrl);saveUser();} });    }