WebView如何调用系统的相机和相册上传文件

大家可以通过产看WebViewClient这个类里面的源码可知，在下面的几个方法里面5.0以下是通过ValueCallbackuploadMsg 来向webview上传我们通过拍照或相册里面获取到的uri而在5.0以上是通过ValueCallbackfilePathCallback 来上传，大家注意这里变成了一个Uri类型的数组，然后我们只需要在我们的openFileChoose()和onShowFileChooser()里面写我们调用系统相机和相册的代码了然后在onActivityResult里面获取Uri，

我们首先要分别声明ValueCallback和ValueCallBack在openFileChoose和onShowFileChooser里面进行赋值就像我下面代码一样

private ValueCallback mUploadMessage;// 表单的数据信息
private ValueCallback mUploadCallbackAboveL;
private final static int FILECHOOSER_RESULTCODE = 1;// 表单的结果回调
private Uri imageUri;
/**
         * web视图
         */
        mWebView.setWebChromeClient(new WebChromeClient() {
            //设置网页加载的进度条
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
                if (newProgress == 100) {
                    mProgressBar.setVisibility(View.GONE);
                } else {
                    mProgressBar.setVisibility(View.VISIBLE);
                    mProgressBar.setProgress(newProgress);
                }
            }
		//android>5.0调用这个方法
            @Override
            public boolean onShowFileChooser(WebView webView,
                                             ValueCallback filePathCallback,
                                             FileChooserParams fileChooserParams) {
                mUploadCallbackAboveL=filePathCallback;
                take();
                return true;
            }
            public void openFileChooser(ValueCallback uploadMsg) {
                mUploadMessage=uploadMsg;
                take();
            }
            public void openFileChooser(ValueCallback uploadMsg,String acceptType) {
                mUploadMessage=uploadMsg;
                take();
            }
            public void openFileChooser(ValueCallback uploadMsg,String acceptType, String capture) {
                mUploadMessage=uploadMsg;
                take();
            }
        });
        if (!TextUtils.isEmpty(mWebUrl)) {
            mBrowserLayout.loadUrl(mWebUrl);
        } else {
            Toast.makeText(this, "获取URL地址失败", Toast.LENGTH_SHORT).show();
        }
    }
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode==FILECHOOSER_RESULTCODE)
    {
        if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
        Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
        if (mUploadCallbackAboveL != null) {
            onActivityResultAboveL(requestCode, resultCode, data);
        }
        else  if (mUploadMessage != null) {
            Log.e("result",result+"");
            if(result==null){
//                   mUploadMessage.onReceiveValue(imageUri);
                mUploadMessage.onReceiveValue(imageUri);
                mUploadMessage = null;

                Log.e("imageUri",imageUri+"");
            }else {
                mUploadMessage.onReceiveValue(result);
                mUploadMessage = null;
            }


        }
    }
}

    @SuppressWarnings("null")
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
        if (requestCode != FILECHOOSER_RESULTCODE
                || mUploadCallbackAboveL == null) {
            return;
        }

        Uri[] results = null;
        if (resultCode == Activity.RESULT_OK) {
            if (data == null) {
                results = new Uri[]{imageUri};
            } else {
                String dataString = data.getDataString();
                ClipData clipData = data.getClipData();

                if (clipData != null) {
                    results = new Uri[clipData.getItemCount()];
                    for (int i = 0; i < clipData.getItemCount(); i++) {
                        ClipData.Item item = clipData.getItemAt(i);
                        results[i] = item.getUri();
                    }
                }

                if (dataString != null)
                    results = new Uri[]{Uri.parse(dataString)};
            }
        }
        if(results!=null){
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        }else{
            results = new Uri[]{imageUri};
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        }

        return;
    }

    private void take(){
        File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyApp");
        // Create the storage directory if it does not exist
        if (! imageStorageDir.exists()){
            imageStorageDir.mkdirs();
        }
        File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
        imageUri = Uri.fromFile(file);

        final List cameraIntents = new ArrayList();
        final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        final PackageManager packageManager = getPackageManager();
        final List listCam = packageManager.queryIntentActivities(captureIntent, 0);
        for(ResolveInfo res : listCam) {
            final String packageName = res.activityInfo.packageName;
            final Intent i = new Intent(captureIntent);
            i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
            i.setPackage(packageName);
            i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            cameraIntents.add(i);

        }
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        Intent chooserIntent = Intent.createChooser(i,"Image Chooser");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
        ServiceWebActivity.this.startActivityForResult(chooserIntent,  FILECHOOSER_RESULTCODE);
    }