You might as well use cordova for development! http://blog.csdn.net/dabaoonline/article/details/50820015 This becomes a matter of js.

cordova

You should also consider the api version:

public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback,
                                             FileChooserParams fileChooserParams) {
                if( fileChooserParams != null){
                    if( android.os.Build.VERSION.SDK_INT >= 21) {
                        mFileChooserCallback = filePathCallback;
                        Intent intent = fileChooserParams.createIntent();
                        try{
                            getActivity().startActivityForResult(intent,200);
                        }catch (Exception e){
                            mFileChooserCallback = null;
                            e.printStackTrace();
                            return false;
                        }
                    }
                }
                return true;
            }
            public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType, String capture) {
                if( android.os.Build.VERSION.SDK_INT < 21) {
                    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);  
                intent.setType("*/*");
                intent.addCategory(Intent.CATEGORY_OPENABLE);
//                    if(mLastSelectFileDir != null && mLastSelectFileDir.length() > 0) {
//                        i.putExtra("init_directory", mLastSelectFileDir);
//                    }
                    mFileChooserCallbackV19 = uploadFile;
                    try{
                        getActivity().startActivityForResult(intent,200);
                    }catch (Exception e){
                        mFileChooserCallbackV19 = null;
                        e.printStackTrace();
                    }
                    uploadFile.onReceiveValue(null);
                }
            }
        });

I don’t know if the poster has encountered this problem. The h5 page adjustment interface of webview has been unable to return results and reported an error. But it is normal to access the h5 page in the browser