android webview type=file文件上传，安卓端代码

http://stackoverflow.com/questions/5907369/file-upload-in-webview

http://blog.csdn.net/longlingli/article/details/16946047

注意：不能再onResume中写加载webview的语句，因为当切换到图像库找照片的时候 自身的activity 被pause了，选好图片切回来的时候再次调用onresume了，webview又重新加载所以图片可能无法显示了

 package com.example.cairh_sjkh_it;

 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
 import android.app.Notification.Action;
 import android.content.Intent;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.webkit.JsResult;
 import android.webkit.ValueCallback;
 import android.webkit.WebChromeClient;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;

 public class MainActivity extends Activity {
     public ValueCallback<Uri> mUploadMessage;
     public final static int FILECHOOSER_RESULTCODE = 1;
      WebView webView;
         @Override
         protected void onCreate(Bundle savedInstanceState)  {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.res);
             webView=(WebView)findViewById(R.id.webview);
             //js调试调试功能支持4.4版本以上的
            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                 WebView.setWebContentsDebuggingEnabled(true);
            }
            //js生效
            webView.getSettings().setJavaScriptEnabled(true);
            //让 h5页面中的 alert生效
            webView.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/*");
                 MainActivity.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("*/*");
                MainActivity.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/*");
                    MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Chooser" ), MainActivity.FILECHOOSER_RESULTCODE );  

                }
                @Override
                public boolean onJsAlert(WebView view,String url,String message,JsResult result)
                {
                    return super.onJsAlert(view,url,message,result);
                } });
            webView.setWebViewClient(new WebViewClient(){
                @Override
                public boolean shouldOverrideUrlLoading(WebView view,String url){
                    // TODO Auto-generated method stub
                    // 使用自己的WebView组件来响应Url加载事件，而不是使用默认浏览器器加载页面
                    view.loadUrl(url);
                    return super.shouldOverrideUrlLoading(view, url);
                }
            });
            webView.getSettings().setDomStorageEnabled(true);
            webView.getSettings().setDatabaseEnabled(true);

            webView.loadUrl("http://192.168.226.153:8080/mobile/index.htm");

         }
         @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;
          }
        }  

         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);  

             }
         }  

         //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);
         }*/
 }