Java 如何从ImageView中的图像获取文件路径？

我正在尝试从ImageView获取图像的文件路径。我已经尝试了许多使用StackOverFlow的实现，但是每一个都失败了。我使用的当前实现有什么问题？我正在Android Studio中使用Android 7.0。我的代码在行中中断：

String pathToImage = pathURI.getPath();

这是我的全部代码：

public class MainActivity extends AppCompatActivity {

static final int REQUEST_IMAGE_CAPUTRE = 1;
ImageView mainImage;
private Uri mImageCaptureUri;

private static final String TAG = "JoelMessage";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button cameraBtn = (Button)findViewById(R.id.cameraBtn);
    mainImage = (ImageView) findViewById(R.id.mainImage);

    //Disable the button if user has no camera
    if(!hasCamera())
        cameraBtn.setEnabled(false);

}

//Check if use has a camera
private boolean hasCamera(){
    return getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY);

}

//Launching the camera
public void launchCamera(View view){
    //intent to launch camera
    Log.i(TAG, "camera launched");
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);


    //Take picture and pass results along to onActivity Result
    startActivityForResult(cameraIntent, REQUEST_IMAGE_CAPUTRE);
}

//If you want to return the image taken.



@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // request code makes sure u got an image and resultCode makes sure that u got no errors
    if (requestCode  == REQUEST_IMAGE_CAPUTRE && resultCode== RESULT_OK ){
        Bundle extras = data.getExtras();
        Bitmap photo = (Bitmap) extras.get("data"); //get photo info and storing it in photo

        ImageView image = (ImageView) findViewById(R.id.mainImage);
        image.setImageBitmap(photo);
        Log.i(TAG, "set image");
        //Log.i(TAG, Integer.toString(x));


        //String pathToImage = mImageCaptureUri.getPath();

        // CALL THIS METHOD TO GET THE URI FROM THE BITMAP
        Uri pathURI = getImageUri(getApplicationContext(), photo);


        String pathToImage = pathURI.getPath();

        //System.out.println(mImageCaptureUri);


        photo = imageOreintationValidator(photo, pathToImage);

        mainImage.setImageBitmap(photo);
    }
}

public Uri getImageUri(Context inContext, Bitmap inImage) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
    return Uri.parse(path);
}

public String getRealPathFromURI(Uri uri) {
    Cursor cursor = getContentResolver().query(uri, null, null, null, null);
    cursor.moveToFirst();
    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
    return cursor.getString(idx);
}
}

编辑 我对Android开发非常陌生，因此我很难确定错误消息的哪一部分是重要的，但以下是我认为重要的错误：

05-10 01:15:56.411 17924-17924/? E/AndroidRuntime: FATAL EXCEPTION: main
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getPath()' on a null object reference
                                                   at com.example.webbj.cameratest.MainActivity.onActivityResult(MainActivity.java:73)

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你收到了什么异常/错误？我编辑了我的原始帖子。