android - 在 webview 应用程序中加载表单操作失败

Question

我正在开发一个WebView应用程序。因此，该应用程序会加载一个上面有表单的网络。当我单击按钮进行处理时，应用程序无法加载，如图所示

我一直在尝试遵循此https://stackoverflow.com/a/7528833/10778924以及此https://stackoverflow.com/a/7528833/10778924和此https://stackoverflow.com/中的代码一个/21899709/10778924

这是我申请的代码

webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
    webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

    if(Build.VERSION.SDK_INT >= 21){
        webSettings.setMixedContentMode(0);
        webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }else if(Build.VERSION.SDK_INT >= 19){
        webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }else {
        webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }

和

public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }

但它仍然不适合我。当我单击一个按钮来处理我的表单时，该应用程序仍然无法加载。

标签： androidwebview

Answer 1

这是我的代码

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
    super.onActivityResult(requestCode, resultCode, intent);
    if(Build.VERSION.SDK_INT >= 21){
        Uri[] results = null;
        //checking if response is positive
        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;
    }else{
        if(requestCode == FCR){
            if(null == mUM) return;
            Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();
            mUM.onReceiveValue(result);
            mUM = null;
        }
    }
}

@SuppressLint({"SetJavaScriptEnabled", "WrongViewCast"})
@SuppressWarnings({"findViewById", "RedundantCast"})
@Override
protected void onCreate(Bundle savedInstanceState){
    //tombol back
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    //title action bar
    getSupportActionBar().setTitle("Deteksi TBS Tanpa Kotak");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mProgressBar=(ProgressBar) findViewById(R.id.progressbar);
    mProgressBar.setMax(100);

    if(Build.VERSION.SDK_INT >=23 && (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)) {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA}, 1);
    }

    webView = (WebView) findViewById(R.id.ifView);
    assert webView != null;
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setAllowFileAccess(true);
    webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
    webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

    if(Build.VERSION.SDK_INT >= 21){
        webSettings.setMixedContentMode(0);
        webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }else if(Build.VERSION.SDK_INT >= 19){
        webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }else {
        webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }
    webView.setWebViewClient(new Callback());
    webView.loadUrl("https://sipenting.000webhostapp.com/user/testingtk"); //add your test web/page address here
    webView.setWebChromeClient(new WebChromeClient() {
        /*
         * openFileChooser is not a public Android API and has never been part of the SDK.
         */
        //handling input[type="file"] requests for android API 16+
        @SuppressLint("ObsoleteSdkInt")
        @SuppressWarnings("unused")
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
            mUM = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("*/*");
            if (multiple_files && Build.VERSION.SDK_INT >= 18) {
                i.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
            }
            startActivityForResult(Intent.createChooser(i, "File Chooser"), FCR);
        }

        //handling input[type="file"] requests for android API 21+
        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_TITLE, "File Chooser");
            chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
            startActivityForResult(chooserIntent, FCR);
            return true;
        }

        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            super.onProgressChanged(view, newProgress);
            mProgressBar.setProgress(newProgress);
        }

        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
        @Override
        public void onReceivedTitle(WebView view, String title) {
            super.onReceivedTitle(view, title);
        }
    });
}

//callback reporting if error occurs
public class Callback extends WebViewClient {
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl){
        Toast.makeText(getApplicationContext(), "Failed loading app!", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
        mProgressBar.setVisibility(View.GONE);
    }

    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
        mProgressBar.setVisibility(View.VISIBLE);
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

//creating new image file here
private File createImageFile() throws IOException{
    @SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "img_"+timeStamp+"_";
    File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    return File.createTempFile(imageFileName,".jpg",storageDir);
}

//back/down key handling
@Override
public boolean onKeyDown(int keyCode, @NonNull KeyEvent event){
    if(event.getAction() == KeyEvent.ACTION_DOWN){
        switch(keyCode){
            case KeyEvent.KEYCODE_BACK:
                if(webView.canGoBack()){
                    webView.goBack();
                }else{
                    finish();
                }
                return true;
        }
    }
    return super.onKeyDown(keyCode, event);
}

@Override
public void onConfigurationChanged(Configuration newConfig){
    super.onConfigurationChanged(newConfig);
}

}