Android中的webview支持页面中的文件上传实例代码

package com.example.webviewupfile;  import java.io.File; import java.io.IOException;  import android.app.Activity; import android.content.ContentResolver; import android.content.Intent; import android.content.res.Configuration; import android.database.Cursor; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.webkit.ValueCallback; import android.webkit.WebChromeClient; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.ProgressBar;  public class MainActivity extends Activity {   private ValueCallback<Uri> mUploadMessage;   private final static int FILECHOOSER_RESULTCODE = 1;   private WebView web;   private ProgressBar progressBar;    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);      web = (WebView) findViewById(R.id.webView1);     progressBar = (ProgressBar) findViewById(R.id.progressBar1);      web = new WebView(this);     web.getSettings().setJavaScriptEnabled(true);     web.loadUrl("http://ueditor.baidu.com/website/onlinedemo.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/*");         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);   }    @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;       Bitmap bm = null;       //外界的程序访问ContentProvider所提供数据 可以通过ContentResolver接口       ContentResolver resolver = getContentResolver();       try {         Uri originalUri = intent.getData(); // 获得图片的uri         bm = MediaStore.Images.Media.getBitmap(resolver, originalUri);         // 这里开始的第二部分，获取图片的路径：         String[] proj = { MediaStore.Images.Media.DATA };         // 好像是android多媒体数据库的封装接口，具体的看Android文档         Cursor cursor = managedQuery(originalUri, proj, null, null,             null);         // 按我个人理解 这个是获得用户选择的图片的索引值         int column_index = cursor             .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);         // 将光标移至开头 ，这个很重要，不小心很容易引起越界         cursor.moveToFirst();         // 最后根据索引值获取图片路径          String path = cursor.getString(column_index);         Uri uri = Uri.fromFile(new File(path));         mUploadMessage.onReceiveValue(uri);       } catch (IOException e) {          Log.e("TAG-->Error", e.toString());        }     }   }    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); }    */ }