registerForActivityResult resultCode得到0值

Question

我尝试使用registerForActivityResult，但是结果是0，这意味着它不能从活动中得到结果。上个月我这么做的时候，代码运行得很好，但是我不知道为什么它今天会出错，我试着检查代码中的错误，但是我认为没有错误。

下面是使用照相机的功能：

private fun UseCamera() {
        val takePictureIntent = Intent (MediaStore.ACTION_IMAGE_CAPTURE)
        val imagePath = File(Environment.getExternalStorageDirectory(), "Pictures")
        val photoFile = File(imagePath, "my_picture.jpg")
        FilePath = FileProvider.getUriForFile(this, FILE_AUTHORITY, photoFile )
        Log.w("FilePath",FilePath.toString())
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, FilePath)
        takePictureIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
        getPreviewImage.launch(takePictureIntent)
        Log.w("UseCamera","Successful")
    }

下面是registerForResultActivity：

        getPreviewImage = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
                result -> Log.e("Preview Image", result.resultCode.toString())
            if (result.resultCode == RESULT_OK) {
                if (!forfood){
                Log.i("File Path", FilePath.toString())
                val SelectedImage = FilePath
                val PicRef = StorageRef.child(preferences.getValue("username").toString())
                    .child("kiosk_pic/" + ImageID)
                PicRef.putFile(SelectedImage).addOnSuccessListener {
                    Toast.makeText(this, "Uploaded", Toast.LENGTH_SHORT).show()
                    PicRef.downloadUrl.addOnSuccessListener {
                        preferences.setValue("kiosk_pic", it.toString())
                        ref.child(preferences.getValue("username").toString()).child("kiosk_picture").setValue(it.toString())
                        setKioskImage(preferences.getValue("kiosk_pic").toString(),ImageID)
                    }
                }
                    .addOnFailureListener {
                        Toast.makeText(this, "Upload Fail", Toast.LENGTH_SHORT).show()
                    }
                    .addOnProgressListener {
                        Toast.makeText(this, "Uploading", Toast.LENGTH_SHORT).show()
                    }
            } else {
                    Log.i("File Path",FilePath.toString())
                    val SelectedImage = FilePath
                    if (add){
                        iv_addimage.setImageURI(SelectedImage)
                    }else{
                        iv_changeimage.setImageURI(SelectedImage)
                    }
                }
        }
        }

我添加了日志，结果是每次我使用相机时：

W/UseCamera: Successfull
D/OpenGLRenderer: endAllActiveAnimators on 0xea49f7f0 (AlertController$RecycleListView) with handle 0xc1acc9b0
E/Preview Image: 0

我在这里做错了什么？因为它以前运作得很好

编辑，日志中也这样写着：

W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.

Answer 1

我已经通过更改UseCamera函数代码来解决这个问题。我不太确定，但我认为问题在于：

        val imagePath = File(Environment.getExternalStorageDirectory(), "Pictures")
        val photoFile = File(imagePath, "my_picture.jpg")

因为我不太确定，我猜是在照片拍摄后创建的临时文件丢失了，所以结果代码返回RESULT_CANCELED。

我将代码改为：

    private fun UseCamera() {
        val takePictureIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        val imageFile = getExternalFilesDir (Environment.DIRECTORY_PICTURES)
        val tempFile = File.createTempFile("my_picture",".jpg",imageFile)
        FilePath = FileProvider.getUriForFile(this, FILE_AUTHORITY,tempFile)
        Log.e("File Path", FilePath.toString())
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,FilePath)
        getPreviewImage.launch(takePictureIntent)
}

并将提供程序路径更改为

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="picture" path="Android/data/com.example.njajal/files/Pictures"/>
</paths>

我希望我的回答，帮助一些有同样问题的人

Answer 2

如果任何使用java的用户都使用它，那么首先将其定义为oncreate方法：

 ActivityResultLauncher<Intent> mStartForResult = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), result -> {
       Log.d("Capture_img", ": "+result.getData());
       if (result.getResultCode()==Activity.RESULT_OK){
           Intent intent = result.getData();
           Uri uri = Objects.requireNonNull(intent).getData();
           String path = uri.getPath();
           File ff = new File("" +path);
           String  pffImage = ff.getName();
           String path111 =  GloabalMethods.imageCompressor(getContext(), path,pffImage);
           File user_img = new File(""+path111);
           Bitmap myBitmap = BitmapFactory.decodeFile(user_img.getAbsolutePath());
           ByteArrayOutputStream bytes = new ByteArrayOutputStream();
           myBitmap.compress(Bitmap.CompressFormat.JPEG,80,bytes);
       binaryImage = Base64.encodeToString(bytes.toByteArray(),Base64.DEFAULT);
           Log.d("RRRRRRRRRRRRRRRR", "onActivityResult: "+uri);
           capture_image.setImageBitmap(myBitmap);
           capture_image.setTag("yes");
       } after that call 
 ImagePicker.with(requireActivity()) .crop() //Crop image(Optional), Check Customization for more option .compress(1024)
//Final image size will be less thanMB(Optional) 
.maxResultSize(1080, 1080).createIntent(intent -> { mStartForResult.launch(intent); return null; } );