Question

我有这个非常简单的应用程序，可以直接从相机上传照片到Firebase，按照Android开发者页面的原始文档编写。它在模拟器上运行得很好，但是在我的Galaxy S4上崩溃了。变量imageFileName在onActivityResult上变为空，但仅在GS4中变为空。以下是模拟器中的内容：

I / TAG 0 :: FILENAME JPEG_20170420_005617 _

I / TAG 1 :: FILENAME JPEG_20170420_005617 _

以下是GS4中的内容：

I / TAG 0 :: FILENAME JPEG_20170420_005617 _

I / TAG 1 :: FILENAME null

为什么它从无到有？为何选择S4？如果没有这个值，我就无法将文件放到Firebase中。仅限GS4。

感谢您的帮助。

private FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();
private StorageReference mStorage;
private Button mSelect, mCam;
public Uri uri, photoURI;
private String imageFileName;

private ProgressDialog mProgressDialog;

private static final int GALLERY_INTENT = 2;
private static final int CAMERA_REQUEST_CODE = 1;
static final int REQUEST_TAKE_PHOTO = 1;

String mCurrentPhotoPath;

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

    mStorage = FirebaseStorage.getInstance().getReference();

    mSelect = (Button) findViewById(R.id.first_but);
    mCam = (Button) findViewById(R.id.sec_but);

    mProgressDialog = new ProgressDialog(this);

    mCam.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            //startActivityForResult(intent, CAMERA_REQUEST_CODE);
            dispatchTakePictureIntent();


        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {
        Log.i("TAG 1: ", "FILENAME " + imageFileName);
    }
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = image.getAbsolutePath();
    return image;
}

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            photoURI = FileProvider.getUriForFile(this,
                    "com.example.android.fileprovider",
                    photoFile);
            Log.i("TAG 0: ", "FILENAME " + imageFileName);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }
}

Answer 1

奇怪的是，解决了这个问题的方法是将其添加到AdroidManifest.xml

<activity
    android:name=".YourActivity"
    android:configChanges="orientation|keyboardHidden|screenSize"
    android:screenOrientation="portrait" >
</activity>

感谢@Janine Kroser

原帖：Photo capture Intent causes NullPointerException on Samsung phones only

除了“三星很奇怪”之外，我还是想解释一下。方向改变是否可能会破坏包含数据的某些活动？

从真实设备上的OnCreate之外的方法获取空值

1 个答案: