我开发一个Android应用程序。基本上它是一个的WebView 和进度。 Facebook的移动网站（m.facebook.com）被装入的WebView 。

I am developing an Android app. Basically it is a WebView and a progressBar. Facebook's mobile site (m.facebook.com) is loaded into the WebView.

当我点击选择文件按钮来上传一张图片，没有任何反应。我已经尝试了所有的解决方案，其中没有工作。我正在测试上的Galaxy Note的（GT-N7000）运行4.0.3。我的最低SDK版本为8。

When I click on the Choose File button to upload an image, nothing happens. I have tried ALL of the solutions and none of them work. I am testing on a Galaxy Note (GT-N7000) running 4.0.3. My minimum SDK version is version 8.

这是我的$ C $下的详细信息...

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;
    }

}

感谢

推荐答案

鉴于高票数我猜没有人已经注意到了第3注释（从的大卫·埃斯特维斯）包含与回答这个问题一个链接。

Given the high number of votes I'm guessing no one has noticed the 3rd comment (from David Esteves) contains a link with to answer to this question.

米歇尔·奥利维尔说：

该解决方案还适用于蜂窝和冰淇淋三明治。似乎   像谷歌推出了一个很酷的新功能（接受属性）和   忘了执行过载向后兼容性。

This solution also works for Honeycomb and Ice Cream Sandwich. Seems like Google introduced a cool new feature (accept attribute) and forgot to to implement an overload for backwards compatibility.

所以，你只需要一个 openFileChooser 超载添加到您的 MyWebChromeClient 类接受字符串参数，然后调用不适用的一项：

So you just need to add a openFileChooser overload to your MyWebChromeClient class that accepts the string parameter and then call the one that does not:

public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType ) 
{  
    this.openFileChooser(uploadMsg);
}

这样做我可以做你的code运行如预期。

Doing this I was able to make your code run as intended.