webView文件上传取消弹窗后再次点击不响应点击事件问题

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webView文件上传取消弹窗后再次点击不响应点击事件问题
在android加载h5界面时，如果该h5界面有调用android的手机相册或者相机功能，那么我们的activity里面应该怎么写呢？我的写法适配了android3.0到android7.0，如果安卓5.0以上的手机出现崩溃的问题，可以参考我下面For Android 5.0+的写法

实现方法是

webView_customer.setWebChromeClient(new WebChromeClient() {
            // For Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;
                ArrayList<String> list = new ArrayList<String>();
                list.add("拍照");
                list.add("从相册选择");
                showTakePicOrPhotoesDialog(Activity_Customer_Edu.this, "选择", list, new DialogUtils.OnClickPicDialogItemListener() {
                    @Override
                    public void onClickItem(int which) {
                        if(0==which){
                            Intent takeIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                            // 下面这句指定调用相机拍照后的照片存储的路径
                            try {
                                File file = createImageFile();
                                takePicUri = Uri.fromFile(file);
                                takeIntent.putExtra(MediaStore.EXTRA_OUTPUT, takePicUri);
                                startActivityForResult(takeIntent, FILECHOOSER_RESULTCODE);
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }else if(1==which){
                            Intent pickIntent = new Intent(Intent.ACTION_PICK, null);                            pickIntent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                            startActivityForResult(pickIntent, FILECHOOSER_RESULTCODE);
                        }
                    }
                });

                          }

            // For Android < 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                openFileChooser(uploadMsg, "");
            }

            // For Android  > 4.1.1
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                openFileChooser(uploadMsg, acceptType);
            }

            // For Android 5.0+
            public boolean onShowFileChooser (WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
                mUploadCallbackAboveL = filePathCallback;
                ArrayList<String> list = new ArrayList<String>();
                list.add("拍照");
                list.add("从相册选择");
                showTakePicOrPhotoesDialog(Activity_Customer_Edu.this, "选择", list, new DialogUtils.OnClickPicDialogItemListener() {
                    @Override
                    public void onClickItem(int which) {
                        if(0==which){
                            Intent takeIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                            // 下面这句指定调用相机拍照后的照片存储的路径
                            try {
                                File file = createImageFile();
                                takePicUri = Uri.fromFile(file);
                                takeIntent.putExtra(MediaStore.EXTRA_OUTPUT, takePicUri);
                                startActivityForResult(takeIntent, FILECHOOSER_RESULTCODE);
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }else if(1==which){
                            Intent pickIntent = new Intent(Intent.ACTION_PICK, null);
                          pickIntent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                            startActivityForResult(pickIntent, FILECHOOSER_RESULTCODE);
                        }
                    }
                });
                return true;
            }

        });

OnActivityResult回调方法：这里有个特别注意的地方，当打开拍照按钮时，Intent data这个数据是空，所以不能正常上传，打开拍照的Intent当时传了一个Uri，在OnActivityResult需要判断data是不是空，是空的话，就把传的那个Uri赋值给mUploadMessage.onReceiveValue，如果不为空就传data.getData();具体如下：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode==FILECHOOSER_RESULTCODE){
        Uri result;
        if (null == mUploadMessage && null == mUploadCallbackAboveL){
            return;
        }

//如果拍完照点击取消按钮就：if(resultCode == RESULT_CANCELED){    result = Uri.EMPTY;}else { if(data == null && resultCode != RESULT_OK){        result = Uri.EMPTY;    }else if(data == null){        result = takePicUri;    }else{        result = data.getData();    }}

        if (mUploadMessage != null) {
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        }

if (mUploadCallbackAboveL != null) {    mUploadCallbackAboveL.onReceiveValue(new Uri[]{result});    mUploadCallbackAboveL = null;}

}
}

这里有一个问题，点击“取消”或返回按钮，无法重复回调 onShowFileChooser 或openFileChooser方法。解决办法：
定义一个方法：

/**
* 防止点击dialog的取消按钮之后，就不再次响应点击事件了
*/
public static void cancelCallback(){
    if(mUploadCallbackAboveL!=null){
        mUploadCallbackAboveL.onReceiveValue(null);
    }

    if(mUploadMessage!=null){
        mUploadMessage.onReceiveValue(null);
    }
}

在弹窗（dialog）的取消按钮监听的方法中调用上面的cancellCallBack方法。比如我的：

/**
* 展示拍照或者从相册选择的Dialog
* @param context
* @param title
* @param names
* @param onClickPicDialogItemListener
*/
public static void showTakePicOrPhotoesDialog(Context context, String title, final ArrayList<String> names, final DialogUtils.OnClickPicDialogItemListener onClickPicDialogItemListener){
    AlertDialog.Builder builder=new AlertDialog.Builder(context);
    builder.setTitle(title);//设置标题
    String[] itemList=(String[]) names.toArray(new String[names.size()]);
    builder.setItems(itemList, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            onClickPicDialogItemListener.onClickItem(which);
        }
    });
    AlertDialog dialog=builder.create();//获取dialog
    dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
        @Override
        public void onCancel(DialogInterface dialog) {
            cancelCallback();
        }
    });
    dialog.show();//显示对话框
}

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