FileUpload在Android WebView中不起作用 [英] FileUpload not working inside Android WebView

问题描述

我知道这个问题在这里被问过很多次，但是我刚刚开始进行android开发，因此困惑于应用这些解决方案.与我的代码FileUpload选项不起作用.它不是打开文件选择对话框.请帮助我

I know this question is asked many times here but I just started android development so getting confused to apply those solutions. With my code FileUpload option not working. It's not opening file choosing dialogue box. Please help me

public class MainActivity extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            WebView mWebView = (WebView) findViewById(R.id.activity_main_webview);
            WebSettings webSettings = mWebView.getSettings();
            webSettings.setJavaScriptEnabled(true);
            mWebView.setWebViewClient(new WebViewClient());
            mWebView.loadUrl("http://google.com");
        }
    }

推荐答案

// variables for camera and choosing files methods
private static final int FILECHOOSER_RESULTCODE = 1;
private ValueCallback<Uri> mUploadMessage;
private Uri mCapturedImageURI = null;
// the same for Android 5.0 methods only
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
private class DefaultWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}
  @Override
 public void onActivityResult (int requestCode, int resultCode, Intent data) {
    // code for all versions except of Lollipop
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        if(requestCode==FILECHOOSER_RESULTCODE) {
            if (null == this.mUploadMessage) {
                return;
            }
            Uri result=null;
            try{
                if (resultCode != RESULT_OK) {
                    result = null;
                } else {
                    // retrieve from the private variable if the intent is null
                    result = data == null ? mCapturedImageURI : data.getData();
                }
            }
            catch(Exception e) {
                Toast.makeText(getApplicationContext(), "activity :"+e, Toast.LENGTH_LONG).show();
            }
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        }
    } // end of code for all versions except of Lollipop
    // start of code for Lollipop only
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        if (requestCode != FILECHOOSER_RESULTCODE || mFilePathCallback == null) {
            super.onActivityResult(requestCode, resultCode, data);
            return;
        }
        Uri[] results = null;
        // check that the response is a good one
        if (resultCode == Activity.RESULT_OK) {
            if (data == null || data.getData() == null) {
                // if there is not data, then we may have taken a photo
                if (mCameraPhotoPath != null) {
                    results = new Uri[]{Uri.parse(mCameraPhotoPath)};
                }
            } else {
                String dataString = data.getDataString();
                if (dataString != null) {
                    results = new Uri[]{Uri.parse(dataString)};}
                }
        }
    mFilePathCallback.onReceiveValue(results);
        mFilePathCallback = null;
    } // end of code for Lollipop only  
   }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        WebView mWebView = (WebView) findViewById(R.id.webview);
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setSavePassword(true);
        webSettings.setSaveFormData(true);
        webSettings.setJavaScriptEnabled(true);
        webSettings.setSupportZoom(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setAllowContentAccess(true);
        webSettings.setAllowFileAccess(true);
       mWebView.setWebViewClient(new DefaultWebViewClient() );
     mWebView.setWebChromeClient(new WebChromeClient()
        {
            // for Lollipop, all in one
            public boolean onShowFileChooser(
                    WebView webView, ValueCallback<Uri[]> filePathCallback,
                    WebChromeClient.FileChooserParams fileChooserParams) {
                if (mFilePathCallback != null) {
                    mFilePathCallback.onReceiveValue(null);
                }
                mFilePathCallback = filePathCallback;
                Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
             File photoFile = null;
                    try {
                        photoFile = createImageFile();
                        takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
                    } catch (IOException ex) {
                        // Error occurred while creating the File
                        Log.e(TAG, "Unable to create Image File", ex);
                    }
                    if (photoFile != null) {
                        mCameraPhotoPath = "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("*/*");
                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, "Choose");
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
                startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
                return true;
            }
            private File createImageFile() throws IOException {
                File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "DirectoryNameHere");
                if (!imageStorageDir.exists()) {
                    imageStorageDir.mkdirs();
                }
                // create an image file name
                imageStorageDir  = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
                return imageStorageDir;
            }
            // openFileChooser for Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;
                try {
                    File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "DirectoryNameHere");
                    if (!imageStorageDir.exists()) {
                        imageStorageDir.mkdirs();
                    }
                    File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
                    mCapturedImageURI = Uri.fromFile(file); // save to the private variable
                    final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
                    // captureIntent.putExtra(MediaStore.EXTRA_SCREEN_ORIENTATION, ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                    i.addCategory(Intent.CATEGORY_OPENABLE);
                    i.setType("*/*");
                    Intent chooserIntent = Intent.createChooser(i, "Choose");
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent});
                    startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
                } catch (Exception e) {
                    Toast.makeText(getBaseContext(), "Camera Exception:" + e, Toast.LENGTH_LONG).show();
                }
            }
            // openFileChooser for Android < 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                openFileChooser(uploadMsg, "");
            }
            // openFileChooser for other Android versions
        /* may not work on KitKat due to lack of implementation of openFileChooser() or onShowFileChooser()
           https://code.google.com/p/android/issues/detail?id=62220
           however newer versions of KitKat fixed it on some devices */
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                openFileChooser(uploadMsg, acceptType);
            }
        });
        mWebView.loadUrl("http://google.com");
    }          

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