Android中的webview支持页面中的文件上传实例代码

Android webview在默认情况下是不支持网页中的文件上传功能的；

如果在网页中有<input type="file" />，在android webview中访问时也会出现浏览文件的按钮

但是点击按钮之后没有反应...

那么如何能够让android的webview能够响应，这个浏览按钮呢？在网上查了很多资料，很多相同的，但都漏掉了一个地方，导致无法读取到文件的完整地址（“c:\upfile\233232.jpg”）,整理最终代码入下：

我们需要为webview设置WebChromeClient，在WebChromeClient的实现类中覆盖文件选择的方法：

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); }
   */
}

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