webview上傳文件

Stack Overflow上面看到的，稍微修改了一下

代碼來源
千萬注意：不要忘記添加互聯網訪問權限

<manifest ... >
    <uses-permission android:name="android.permission.INTERNET" />
    ...
</manifest>

package com.example.webapp;

import android.support.v7.app.ActionBarActivity;
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.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

public class MainActivity extends ActionBarActivity {
    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.activity_main); 
        WebView web = (WebView) findViewById(R.id.webView1);  
        progressBar = (ProgressBar)findViewById(R.id.progressBar1);  

        web = new WebView(this);    
        web.getSettings().setJavaScriptEnabled(true);  
        web.loadUrl("https://au1.caspio.com/dp.asp?AppKey=d5853000be6a5a4787a64474a257");  
        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/*");    
                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 );  

               }  

        });   

        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);  
    }*/  

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}