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); } 
   */ 
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。