Android中的webview支持页面中的文件上传

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;@Overrideprotected 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 4.1public 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);}@Overrideprotected 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uribm = 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 {@Overridepublic void onPageStarted(WebView view, String url, Bitmap favicon) {// TODO Auto-generated method stubsuper.onPageStarted(view, url, favicon);}@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {// TODO Auto-generated method stubview.loadUrl(url);return true;}@Overridepublic void onPageFinished(WebView view, String url) {// TODO Auto-generated method stubsuper.onPageFinished(view, url);progressBar.setVisibility(View.GONE);}}// flipscreen not loading again@Overridepublic 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); } */}