Ich entwickle eine Android App. Grundsätzlich ist es einWebView und eine progressBar. Die mobile Seite von Facebook (m.facebook.com) wird in die geladenWebView.

Wenn ich auf die Schaltfläche "Datei auswählen" klicke, um ein Bild hochzuladen, geschieht nichts. Ich habe ALLE Lösungen ausprobiert und keine funktioniert. Ich teste auf einem Galaxy Note (GT-N7000), auf dem 4.0.3 ausgeführt wird. Meine minimale SDK-Version ist Version 8.

Hier ist mein Code für mehr Infos ...

public class IStyla extends Activity {
    private ValueCallback<Uri> mUploadMessage;
    private final static int FILECHOOSER_RESULTCODE = 1;

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage)
                return;
            Uri result = intent == null || resultCode != RESULT_OK ? null
                    : intent.getData();
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;

        }
    }
    private class MyWebChromeClient extends WebChromeClient {
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            IStyla.this.startActivityForResult(Intent.createChooser(i, "Image Browser"), FILECHOOSER_RESULTCODE);
        }

        @Override
        public boolean onJsAlert(WebView view, String url, String message,final JsResult result) {
            //handle Alert event, here we are showing AlertDialog
            new AlertDialog.Builder(IStyla.this)
                .setTitle("JavaScript Alert !")
                .setMessage(message)
                .setPositiveButton(android.R.string.ok,
                    new AlertDialog.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // do your stuff
                            result.confirm();
                        }
                    }).setCancelable(false).create().show();
            return true;
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_istyla);
        WebView webView = (WebView) findViewById(R.id.webView1);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.setWebChromeClient(new MyWebChromeClient(){
            public void onProgressChanged(WebView view, int progress) {
                // Activities and WebViews measure progress with different scales.
                // The progress meter will automatically disappear when we reach 100%
                ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
                if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE){
                    progressBar.setVisibility(ProgressBar.VISIBLE);
                }
                progressBar.setProgress(progress);
                if(progress == 100) {
                    progressBar.setVisibility(ProgressBar.GONE);
                }
            }
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                IStyla.this.startActivityForResult(Intent.createChooser(i, "Image Browser"), FILECHOOSER_RESULTCODE);
            }
        });
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
                progressBar.setVisibility(ProgressBar.VISIBLE);
                return true;
            }

        });
        webView.loadUrl("https://m.facebook.com");

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK){
            if(((WebView)findViewById(R.id.webView1)).canGoBack()){
                ((WebView)findViewById(R.id.webView1)).goBack();
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_istyla, menu);
        return true;
    }

}

Vielen Dank