android:webview实现简单的浏览器

实现了浏览器的返回前进主页退出输入网址的功能

注释的很清楚啦就不多说了

首先是布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <LinearLayout        android:orientation="horizontal"        android:layout_width="fill_parent"        android:layout_height="wrap_content" >        <EditText            android:id="@+id/et_url"            android:layout_width="320dp"            android:layout_height="wrap_content" />                <Button             android:id="@+id/btn_login"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:text="登录"            />    </LinearLayout>    <WebView        android:layout_weight="2"        android:id="@+id/webView"        android:layout_width="fill_parent"        android:layout_height="fill_parent" />    <LinearLayout         android:layout_weight="7.5"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:orientation="horizontal"        android:background="#000000"        >        <Button             android:id="@+id/btn_back"            android:layout_weight="1"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:text="←"            />        <Button             android:id="@+id/btn_menu"            android:layout_weight="1"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:text="主页"            />        <Button             android:id="@+id/btn_forward"            android:layout_weight="1"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:text="→"            />        <Button             android:id="@+id/btn_exit"            android:layout_weight="1"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:text="exit"            />    </LinearLayout></LinearLayout>

MainActivity

package com.example.webview;import android.os.Bundle;import android.app.Activity;import android.view.KeyEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity implements OnClickListener {private String url = null;private WebView webView;private EditText et_url;private Button btn_login;private Button btn_back;private Button btn_exit;private Button btn_forward;private Button btn_menu;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 窗口进度条requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);setContentView(R.layout.activity_main);setProgressBarIndeterminate(true);webView = (WebView) findViewById(R.id.webView);et_url = (EditText) findViewById(R.id.et_url);btn_login = (Button) findViewById(R.id.btn_login);btn_back = (Button) findViewById(R.id.btn_back);btn_exit = (Button) findViewById(R.id.btn_exit);btn_forward = (Button) findViewById(R.id.btn_forward);btn_menu = (Button) findViewById(R.id.btn_menu);// 对五个按钮添加点击监听事件btn_login.setOnClickListener(this);btn_back.setOnClickListener(this);btn_exit.setOnClickListener(this);btn_forward.setOnClickListener(this);btn_menu.setOnClickListener(this);}// btn_login的触发事件 点击后 webView开始读取urlprotected void startReadUrl(String url) {// TODO Auto-generated method stub// webView加载web资源webView.loadUrl(url);// 覆盖webView默认通过系统或者第三方浏览器打开网页的行为// 如果为false调用系统或者第三方浏览器打开网页的行为webView.setWebViewClient(new WebViewClient() {@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {// TODO Auto-generated method stub// webView加载web资源view.loadUrl(url);return true;}});// 启用支持javascriptWebSettings settings = webView.getSettings();settings.setJavaScriptEnabled(true);// web加载页面优先使用缓存加载settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);// 当打开页面时 显示进度条 页面打开完全时 隐藏进度条webView.setWebChromeClient(new WebChromeClient() {@Overridepublic void onProgressChanged(WebView view, int newProgress) {// TODO Auto-generated method stubsetTitle("本页面已加载" + newProgress + "%");if (newProgress == 100) {closeProgressBar();} else {openProgressBar(newProgress);}super.onProgressChanged(view, newProgress);}});}// 打开进度条protected void openProgressBar(int x) {// TODO Auto-generated method stubsetProgressBarIndeterminateVisibility(true);setProgress(x);}// 关闭进度条protected void closeProgressBar() {// TODO Auto-generated method stubsetProgressBarIndeterminateVisibility(false);}// 改写物理按键 返回键的逻辑@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif (keyCode == KeyEvent.KEYCODE_BACK) {if (webView.canGoBack()) {// 返回上一页面webView.goBack();return true;} else {// 退出程序finish();}}return super.onKeyDown(keyCode, event);}// 对按钮事件的处理@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.btn_login:url = "http://" + et_url.getText().toString();url = url.replace(" ", "");startReadUrl(url);break;case R.id.btn_back:if (webView.canGoBack()) {webView.goBack();} else {finish();}break;case R.id.btn_forward:if (webView.canGoForward()) {webView.goForward();}break;case R.id.btn_exit:finish();break;case R.id.btn_menu:startReadUrl("http://www.baidu.com");break;}}}

最后不要忘记在AndroidManifest.xml文件中配置网络访问的权限

    <uses-permission android:name="android.permission.INTERNET"/>

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