Question

我需要从webview中选择一张图片并将其上传到服务器上。该代码有效，但如果我在没有选择任何内容的情况下按回，则下次控件不会进入onShowFileChooser。

我在Android浏览器上检查过相同的内容并且它在那里工作，所以必须有一些我不知道的东西。

以下是代码：

web.setWebChromeClient(new BizzerClient());
        web.setWebViewClient(new WebViewClient(){

            //=========================================
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url){
                if(url.contains(Domain) && !url.startsWith(SMS)){
                    //== if url is of same site and not related to sms, do nothing                  
                }else{
                    Intent i = new Intent(Intent.ACTION_VIEW);
                    i.setData(Uri.parse(url));
                    startActivity(i);
                    return true;
                }               
                return false;
            }
        });

//=========================================
    @Override  
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {  
        if(requestCode==FileChooser){  
            Uri result = intent == null || resultCode != RESULT_OK ?null:Uri.parse(intent.getDataString());
            if(result==null) return;
            if(fPathCallback!=null){
                fPathCallback.onReceiveValue(new Uri[]{result});
                fPathCallback = null;
            }else{
                upload.onReceiveValue(result);  
                upload = null;
            }
        }
    }  


    //=====================================================
    class BizzerClient extends WebChromeClient{

        //=========================================
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {
            upload = uploadMsg;         
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
            i.addCategory(Intent.CATEGORY_OPENABLE);  
            i.setType("image/*");  
            startActivityForResult(Intent.createChooser(i,"File Chooser"), FileChooser); 
        }

        //=========================================
        //== For Android 3.0+
        public void openFileChooser( ValueCallback uploadMsg, String acceptType ) {
            upload = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("*/*");
            startActivityForResult(Intent.createChooser(i, "File Browser"),FileChooser);
        }

        //=========================================
        //== For Android 4.1
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){
            upload = uploadMsg; 
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
            i.addCategory(Intent.CATEGORY_OPENABLE);  
            i.setType("image/*");  
            startActivityForResult( Intent.createChooser( i, "File Chooser" ), FileChooser );
        }

        //=========================================
        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback,WebChromeClient.FileChooserParams fileChooserParams) {
            fPathCallback = filePathCallback;   
            Toast.makeText(getApplicationContext(), "A", Toast.LENGTH_SHORT).show();
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
            i.addCategory(Intent.CATEGORY_OPENABLE);  
            i.setType("image/*");  
            startActivityForResult(Intent.createChooser(i,"File Chooser"), FileChooser); 
            return true;
        }
    }

有谁知道如何解决这个问题？

Answer 1

我的同事有完全相同的问题，他已经修复了

upload.onReceiveValue（空）

Answer 2

我遇到了同样的问题，问题是我希望看到一个OnActivityResult，但是当您按下“后退”按钮时，却没有触发。

该解决方案是在onResume上实现以下代码，以告知回调答案为空并且可以重复使用：

@Override
protected void onResume() {
    super.onResume();
    if (fPathCallback == null)
        return;

    fPathCallback.onReceiveValue(new Uri[]{});
    fPathCallback = null;
}

来自android webview的FilePicker只工作一次

2 个答案: