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;

	@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); }
	 */
}