從圖庫中捕獲或拍攝圖像在Android 5.1中給出空指針異常？

Question

我想從SD卡獲取相片，並選擇圖像，但是當我從SD卡中選擇圖像，將在其他OS 5.1操作系統崩潰，這是工作的罰款

public String getImagePath(Uri uri) { 
     Cursor cursor = getContentResolver().query(uri, null, null, null, null); 
     cursor.moveToFirst(); 
     String document_id = cursor.getString(0); 
     document_id = document_id.substring(document_id.lastIndexOf(":") + 1); 
     cursor.close(); 

     cursor = getContentResolver().query(
       MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
       null, MediaStore.Images.Media._ID + " = ? ", new String[]{document_id}, null); 
     cursor.moveToFirst(); 
     String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); 
     cursor.close(); 

     return path; 
    } 



// Error Coming in this line 
String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); 

Answer 1

嘗試下面獲取路徑：

public String getImagePath(Uri uri) { 
    String[] projection = {MediaStore.Images.Media.DATA}; 
    Cursor cursor = getContentResolver().query(uri, 
      projection, null, null, null); 
    int column_index = cursor.getColumnIndexOrThrow(projection[0]); 
    cursor.moveToFirst(); 
    return cursor.getString(column_index); 
}