三星、华为等android里webview不支持input file的解决方法

由于安全因素android webview屏蔽了文件上传控件，但是他并没有完全封掉。

<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>

1.activity定义

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

2.扩展WebChromeClient

WebChromeClient chromeClient = new WebChromeClientImpl();view.setWebChromeClient(chromeClient);

3.实现WebChromeClientImpl类

private class WebChromeClientImpl extends WebChromeClient{
 
 //扩展支持alert事件
 @Override
 public boolean onJsAlert(WebView view, String url, String message,JsResult result) {
    Builder builder = new Builder(view.getContext());
    builder.setTitle("商机通提示").setMessage(message).setPositiveButton("确定", null);
    builder.setCancelable(false);
    builder.setIcon(R.drawable.ic_launcher);
    AlertDialog dialog = builder.create();
    dialog.show();
    result.confirm();
    return true;
 }
 //扩展浏览器上传文件
 //3.0++版本
 public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
    mUploadMessage = uploadMsg;
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("*/*");
    activity.startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
 }
 //3.0--版本
 public void openFileChooser(ValueCallback<Uri> uploadMsg) {
    mUploadMessage = uploadMsg;
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("*/*");
    activity.startActivityForResult(Intent.createChooser(i, "file Browser"),FILECHOOSER_RESULTCODE);
   }
 }

以下是所有的android版本的一个完整的解决方案

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

WebView web;
ProgressBar progressBar;

private ValueCallback 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 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 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);
}*/
}

此外，我想补充一点， “上传页面”像在这个例子中， < 4个版本不会工作，因为它有一个图像预览功能，如果你想使它工作使用一个简单的php上传无预览。

对于一些手机品牌修改了android浏览器，比如：三星，我们可以查看他们官网找到解决办法的。samsung developers