根据Uri获取文件的绝对路径

简易版处理(实际并没发现有什么问题)

public static String getRealPathFromURI(Context context, Uri contentURI) {
   String result;
   Cursor cursor = context.getContentResolver().query(contentURI,
         new String[]{MediaStore.Images.ImageColumns.DATA},//
         null, null, null);
   if (cursor == null) result = contentURI.getPath();
   else {
      cursor.moveToFirst();
      int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
      result = cursor.getString(index);
      cursor.close();
   }
   return result;
}

 

复杂版处理

/**
 * 根据图片的Uri获取图片的绝对路径(适配多种API)
 *
 * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null
 */
public static String getRealPathFromUri(Context context, Uri uri) {
   int sdkVersion = Build.VERSION.SDK_INT;
   if (sdkVersion < 11) return getRealPathFromUri_BelowApi11(context, uri);
   if (sdkVersion < 19) return getRealPathFromUri_Api11To18(context, uri);
   else return getRealPathFromUri_AboveApi19(context, uri);
}

/**
 * 适配api19以上,根据uri获取图片的绝对路径
 */
@TargetApi(Build.VERSION_CODES.KITKAT)
private static String getRealPathFromUri_AboveApi19(Context context, Uri uri) {
   String filePath = null;
   String wholeID = DocumentsContract.getDocumentId(uri);

   // 使用':'分割
   String id = wholeID.split(":")[1];

   String[] projection = {MediaStore.Images.Media.DATA};
   String selection = MediaStore.Images.Media._ID + "=?";
   String[] selectionArgs = {id};

   Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,//
         projection, selection, selectionArgs, null);
   int columnIndex = cursor.getColumnIndex(projection[0]);
   if (cursor.moveToFirst()) filePath = cursor.getString(columnIndex);
   cursor.close();
   return filePath;
}

/**
 * 适配api11-api18,根据uri获取图片的绝对路径
 */
private static String getRealPathFromUri_Api11To18(Context context, Uri uri) {
   String filePath = null;
   String[] projection = {MediaStore.Images.Media.DATA};
   CursorLoader loader = new CursorLoader(context, uri, projection, null, null, null);
   Cursor cursor = loader.loadInBackground();

   if (cursor != null) {
      cursor.moveToFirst();
      filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
      cursor.close();
   }
   return filePath;
}

/**
 * 适配api11以下(不包括api11),根据uri获取图片的绝对路径
 */
private static String getRealPathFromUri_BelowApi11(Context context, Uri uri) {
   String filePath = null;
   String[] projection = {MediaStore.Images.Media.DATA};
   Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);
   if (cursor != null) {
      cursor.moveToFirst();
      filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
      cursor.close();
   }
   return filePath;
}