startActivityForResult已弃用，我正在尝试更新代码[重复]

Question

我是android新手。只是试着制作一个webview应用程序而不是一个实际的移动应用程序，然后我会将我的flask应用程序用作一个移动应用程序。

该应用程序运行良好，没有任何问题，但start ActivityForResult正在给我一个警告。代码如下：

    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
        String[] perms = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.CAMERA};

        //checking for storage permission to write images for upload
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, perms, FCR);

            //checking for WRITE_EXTERNAL_STORAGE permission
        } else if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, FCR);

            //checking for CAMERA permissions
        } else if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, FCR);
        }
        if (mUMA != null) {
            mUMA.onReceiveValue(null);
        }
        mUMA = filePathCallback;
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(MainActivity.this.getPackageManager()) != null) {
            File photoFile = null;
            try {
                photoFile = createImageFile();
                takePictureIntent.putExtra("PhotoPath", mCM);
            } catch (IOException ex) {
                Log.e(TAG, "Image file creation failed", ex);
            }
            if (photoFile != null) {
                mCM = "file:" + photoFile.getAbsolutePath();
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
            } else {
                takePictureIntent = null;
            }
        }
        Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
        contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
        contentSelectionIntent.setType("*/*");
        if (multiple_files) {
            contentSelectionIntent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
        }
        Intent[] intentArray;
        if (takePictureIntent != null) {
            intentArray = new Intent[]{takePictureIntent};
        } else {
            intentArray = new Intent[0];
        }

        Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
        chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
        startActivityForResult(chooserIntent, FCR);

        return true;
    }

这是onActivityResult，我仍然无法让它工作。。。

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
    super.onActivityResult(requestCode, resultCode, intent);
    Uri[] results = null;
    if(resultCode== Activity.RESULT_OK){
        if(requestCode == FCR){
            if(null == mUMA){
                return;
            }
            if(intent == null || intent.getData() == null){
                if(mCM != null){
                    results = new Uri[]{Uri.parse(mCM)};
                }
            }else{
                String dataString = intent.getDataString();
                if(dataString != null){
                    results = new Uri[]{Uri.parse(dataString)};
                } else {
                    if(multiple_files) {
                        if (intent.getClipData() != null) {
                            final int numSelectedFiles = intent.getClipData().getItemCount();
                            results = new Uri[numSelectedFiles];
                            for (int i = 0; i < numSelectedFiles; i++) {
                                results[i] = intent.getClipData().getItemAt(i).getUri();
                            }
                        }
                    }
                }
            }
        }
    }
    mUMA.onReceiveValue(results);
    mUMA = null;
}

Answer 1

用“活动结果”的回调替换startActivityForResult

Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityIntent.launch(chooserIntent);

活动结果的回调-start ActivityIntent

ActivityResultLauncher<Intent> startActivityIntent = registerForActivityResult(
        new ActivityResultContracts.StartActivityForResult(),
        new ActivityResultCallback<ActivityResult>() {
            @Override
            public void onActivityResult(ActivityResult result) {
               // Add same code that you want to add in onActivityResult method
            }
        });

有关更多信息，请查看官方文档。