Android浏览器直接打开网页上的文档

public class FileOpenTestActivity extends Activity {

 private WebView webView;
 private Context mContext = null;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  this.mContext = this;
  webView = (WebView) findViewById(R.id.webview);
  webView.getSettings().setJavaScriptEnabled(true);
  webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
  webView.setWebViewClient(new WebViewClient() {

   public boolean shouldOverrideUrlLoading(WebView view, String url) {
    //判断是否是文件下载链接，如果不是则返回，直接访问
    String fileName = url.substring(url.lastIndexOf("/"));
    if(null == getFileType(fileName) || getFileType(fileName).equals("")){
     return false;
    }
    
    //如果是文件下载链接，先下载，再调用系统安装的阅读器打开
    try {
     //下载文件到SD卡
     File file = downloadFile(url);
     //调用适合的阅读器显示文件
     startActivity(getFileIntent(file));
    } catch (ActivityNotFoundException e) {
     e.printStackTrace();
    }
    return true;
   }
  });
  webView.loadUrl("http://localhost:8888/OpenFile/fileList.html");
 }

 /**
  * 下载文件
  * @param fileUrl
  * @return
  */
 public File downloadFile(String fileUrl) {
  File apkFile = null;
  String fileName = fileUrl.substring(fileUrl.lastIndexOf("/"));
  try {
   if (Environment.getExternalStorageState().equals(
     Environment.MEDIA_MOUNTED)) {
    // 获得存储卡的路径
    String sdpath = Environment.getExternalStorageDirectory() + "/";
    String mSavePath = sdpath + "download";
    URL url = new URL(fileUrl);
    // 创建连接
    HttpURLConnection conn = (HttpURLConnection) url
      .openConnection();
    conn.connect();
    // 获取文件大小
    //int length = conn.getContentLength();
    // 创建输入流
    InputStream is = conn.getInputStream();

    File file = new File(mSavePath);
    // 判断文件目录是否存在
    if (!file.exists()) {
     file.mkdir();
    }
    apkFile = new File(mSavePath, fileName);
    if(apkFile.exists()){
     return apkFile;
    }
    FileOutputStream fos = new FileOutputStream(apkFile);
    int count = 0;
    int numread = 0;
    byte buf[] = new byte[1024];
    while ((numread = is.read(buf)) != -1) {
     fos.write(buf, 0, numread);
    }
    fos.flush();
    fos.close();
    is.close();
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  return apkFile;
 }

 /**
  * 获取用于文件打开的intent
  * @param file
  * @return
  */
 public Intent getFileIntent(File file)

 {
  Intent intent = new Intent("android.intent.action.VIEW");
  intent.addCategory("android.intent.category.DEFAULT");
  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  Uri uri = Uri.fromFile(file);
  String fileType = getFileType(file.getName());
  intent.setDataAndType(uri, fileType);
  return intent;
 }
 /**
  * 从配置文件获取要下载的文件后缀和对应的MIME类型
  * @param fileName
  * @return
  */
 public String getFileType(String fileName){
  String [] names = this.mContext.getResources().getStringArray(R.array.file_name_array);
  String [] types = this.mContext.getResources().getStringArray(R.array.file_type_array);
  for(int i=0;i<names.length;i++){
   if(fileName.toLowerCase().indexOf(names[i])>=0){
    return types[i];
   }
  }
  return "";
 }
}