我试图从一个包传递一个包到另一个包的_imagesPaths
字符串数组。NullPointer在不同的包之间发送字符串时
我曾尝试以下:
//sending the paths of images from `MainActivity` which is in `main.packages`
//assume the array is not null
Intent b = new Intent(MainActivity.this, EditPicturesActivity.class);
b.putExtra("left",LeftImageString);
b.putExtra("right",RightImageString);
路径在另一个包通过执行以下操作接收: private String[] _imagesPath;
捆绑额外= getIntent()getExtras();
_imagesPath [0] = extras.getString(“left”); _imagesPath [1] = extras.getString(“right”);
接下来,我尝试加载路径提供的图像,但我得到一个NullPointer
,其中说_imagesPath is null
。
编辑
_imagesPath的值是通过做从图库中选择图片分配: 在本次活动
private String[] _imagesPath = null;
case SELECT_PICTURE1:
if (resultCode == RESULT_OK) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
LeftImageString = cursor.getString(columnIndex);
cursor.close();
//the toast displays the path and it is not null
Toast.makeText(
getApplicationContext(),
"The path of the first image you have selected is: "
+ LeftImageString, Toast.LENGTH_SHORT).show();
// String leftImagePath contains the path of selected Image
//intent for "left" is placed here
}
break;
//similary image is taken for Image 2.
你在哪里给'_imagesPath'设置了值? – BobTheBuilder
如何初始化_imagesPath? – hasan83
您正在将_imagespath设置为null。为什么你会惊讶地发现一个空的异常? – Kuffs