WebView 中的文件上传

File Upload in WebView(WebView 中的文件上传)

问题描述

自从最近几次以来，我一直在努力从 WebView 上传文件几天了，一点进展都没有.我用谷歌搜索并实施了所有建议解决方案，但没有一个有效，例如:解决方案建议这里，等等.

I have been struggling to upload files from WebView since last few days and there is no progress. I googled and implemented all suggested solutions but none works, like: solutions suggested here, and so on.

问题:我有一个带有以下代码的 HTML 页面来上传文件.它在 Firefox 等桌面浏览器和内置浏览器中运行良好模拟器/AVD，即当我点击浏览..."按钮呈现元素，浏览器打开一个对话框我可以在其中选择要上传的文件的框.

Problem: I have a HTML page with the following code to upload a file. It works fine in a desktop browser like Firefox and built-in browser of emulator / AVD i.e., when I click "Browse..." button rendered by element, browser opens a Dialog box where I can choose a file to upload.

但是，在 android 3.0 模拟器/AVD 中，当我点击选择文件"，没有任何反应，没有打开文件对话框！！！

However, in the android 3.0 emulator / AVD, when I click on "Choose file", nothing happens, no file dialog is opened!!!

<form method="POST" enctype="multipart/form-data">
File to upload: <input type="file" name="uploadfile">&nbsp;&nbsp;
<input type="submit" value="Press to Upload..."> to upload the file!
</form>

谁能尽早提出一个可能的解决方案.

推荐答案

这是一个适用于所有安卓版本的完整解决方案，我也遇到了困难.

This is a full solution for all android versions, I had a hard time with this too.

public class MyWb extends Activity {
/** Called when the activity is first created. */

WebView web;
ProgressBar progressBar;

private ValueCallback<Uri> mUploadMessage;  
 private final static int FILECHOOSER_RESULTCODE=1;  

 @Override  
 protected void onActivityResult(int requestCode, int resultCode,  
                                    Intent intent) {  
  if(requestCode==FILECHOOSER_RESULTCODE)  
  {  
   if (null == mUploadMessage) return;  
            Uri result = intent == null || resultCode != RESULT_OK ? null  
                    : intent.getData();  
            mUploadMessage.onReceiveValue(result);  
            mUploadMessage = null;  
  }
  }  

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    web = (WebView) findViewById(R.id.webview01);
    progressBar = (ProgressBar) findViewById(R.id.progressBar1);

    web = new WebView(this);  
    web.getSettings().setJavaScriptEnabled(true);
    web.loadUrl("http://www.script-tutorials.com/demos/199/index.html");
    web.setWebViewClient(new myWebClient());
    web.setWebChromeClient(new WebChromeClient()  
    {  
           //The undocumented magic method override  
           //Eclipse will swear at you if you try to put @Override here  
        // For Android 3.0+
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {  

            mUploadMessage = uploadMsg;  
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
            i.addCategory(Intent.CATEGORY_OPENABLE);  
            i.setType("image/*");  
            MyWb.this.startActivityForResult(Intent.createChooser(i,"File Chooser"), FILECHOOSER_RESULTCODE);  

           }

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

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

           }

    });  


    setContentView(web);  


}

public class myWebClient extends WebViewClient
{
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        // TODO Auto-generated method stub
        super.onPageStarted(view, url, favicon);
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        // TODO Auto-generated method stub

        view.loadUrl(url);
        return true;

    }

    @Override
    public void onPageFinished(WebView view, String url) {
        // TODO Auto-generated method stub
        super.onPageFinished(view, url);

        progressBar.setVisibility(View.GONE);
    }
}

//flipscreen not loading again
@Override
public void onConfigurationChanged(Configuration newConfig){        
    super.onConfigurationChanged(newConfig);
}

// To handle "Back" key press event for WebView to go back to previous screen.
/*@Override
public boolean onKeyDown(int keyCode, KeyEvent event) 
{
    if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) {
        web.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}*/
}

我还想补充一点，像本例中的上传页面"在 < 上不起作用.4个版本，因为它有图片预览功能，如果你想让它工作，使用一个简单的php上传，不带预览.

Also I want to add that the "upload page" like the one in this example, wont work on < 4 versions, since it has an image preview feature, if you want to make it work use a simple php upload without preview.

更新:

请在这里找到棒棒糖设备的解决方案 并感谢 鬼脸

更新 2:

在 oreo here 和 这是更高级的版本，你应该看看它，也许它可以帮助.

Complete solution for all android devices till oreo here and this is more advanced version, you should look into it, maybe it can help.

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