android真机测试时获取系统图片的Cursor老是空指针异常，怎么解？

Question

android真机测试时获取系统图片的Cursor老是空指针异常，怎么解？手机用的是米4，android 6.0。可以打开图库，选择图片后返回出现空指针异常，cursor为空。Cursor cursor = act.getContentResolver().query(uri, projection, null, null, null);uri和projection都有值，模拟器测试正常。public void changePic(View view){    Intent intent=new Intent();     intent.setType("image/*");     intent.setAction(Intent.ACTION_GET_CONTENT);     startActivityForResult(intent, 1); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {     super.onActivityResult(requestCode, resultCode, data);     if(resultCode == RESULT_OK){         String fileName = null;         if(requestCode==1 && resultCode==RESULT_OK && null!=data){             Uri selectedImage=data.getData();             String[] filePathColumn={MediaStore.Images.Media.DATA};             Cursor cursor=getContentResolver().query(selectedImage, filePathColumn, null, null, null);             cursor.moveToFirst();//空指针异常，selectedImage, filePathColumn两个参数都有值             int columnIndex=cursor.getColumnIndex(filePathColumn[0]);             String picturePath=cursor.getString(columnIndex);             cursor.close();             PictrueConfig pic=new PictrueConfig();             Bitmap bitmap=pic.compressImageFromFile(fileName);             Date date = new Date(System.currentTimeMillis());             String dateTime = date.getTime() + "";             shopPic="pic"+dateTime+"_11.jpg";             fileName=pic.saveToSdCard(bitmap, dateTime, ShopManaActivity.this);             shopImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));             targeturl = fileName; } } }

Answer 1

希望能多提供一点代码，以及相关log。