新建android项目，应用默认配置，其他地方不做修改。新建一个activity，项目目录结构为：

package cn.qiu.webview2;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity { private EditText editText; private Button button; private Button button2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button=(Button)findViewById(R.id.button); editText=(EditText)findViewById(R.id.editText); button2=(Button)findViewById(R.id.button2); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final String editTextMes=editText.getText().toString(); Intent intent=new Intent(MainActivity.this,BaiduActivity.class); intent.putExtra("url",editTextMes); Toast.makeText(MainActivity.this,editTextMes,Toast.LENGTH_LONG).show(); startActivity(intent); } }); button2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(MainActivity.this,LearnActivity.class); startActivity(intent); } }); }}三、修改baiduactivity

package cn.qiu.webview2;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Toast;public class BaiduActivity extends AppCompatActivity { private WebView webView; private long exitTime = 0; @Override protected void onCreate(Bundle savedInstanceState) { Intent intent=getIntent(); String url=intent.getStringExtra("url"); Toast.makeText(BaiduActivity.this,url,Toast.LENGTH_LONG).show(); super.onCreate(savedInstanceState); setContentView(R.layout.activity_baidu); webView = new WebView(this); webView.setWebViewClient(new WebViewClient() { //设置在webView点击打开的新网页在当前界面显示,而不跳转到新的浏览器中 @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } }); webView.getSettings().setJavaScriptEnabled(true); //设置WebView属性,运行执行js脚本 webView.loadUrl("https://"+url+"/"); //调用loadUrl方法为WebView加入链接 webView.setWebViewClient(new WebViewClient(){ // @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { try{ if(url.startsWith("baiduboxlite://")||url.startsWith("https://")||url.startsWith("baiduboxapp://")){ Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); startActivity(intent); return true; } }catch (Exception e){ return false; } webView.loadUrl(url); return true; } }); setContentView(webView); //调用Activity提供的setContentView将webView显示出来 } //我们需要重写回退按钮的时间,当用户点击回退按钮： //1.webView.canGoBack()判断网页是否能后退,可以则goback() //2.如果不可以连续点击两次退出App,否则弹出提示Toast @Override public void onBackPressed() { if (webView.canGoBack()) { webView.goBack(); } else { if ((System.currentTimeMillis() - exitTime) > 2000) { Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show(); exitTime = System.currentTimeMillis(); } else { super.onBackPressed(); } } }}四、修改learnactivity

package cn.qiu.webview2;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Toast;public class LearnActivity extends AppCompatActivity { private WebView webView; private long exitTime = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_learn); webView = new WebView(this); webView.setWebViewClient(new WebViewClient() { //设置在webView点击打开的新网页在当前界面显示,而不跳转到新的浏览器中 @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } }); webView.getSettings().setJavaScriptEnabled(true); //设置WebView属性,运行执行js脚本 webView.loadUrl("https://www.yiibai.com/android/"); //调用loadUrl方法为WebView加入链接 webView.setWebViewClient(new WebViewClient(){ // @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { try{ if(url.startsWith("baiduboxlite://")||url.startsWith("https://")||url.startsWith("baiduboxapp://")||url.startsWith("http://")){ Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); startActivity(intent); return true; } }catch (Exception e){ return false; } webView.loadUrl(url); return true; } }); setContentView(webView); //调用Activity提供的setContentView将webView显示出来 } //我们需要重写回退按钮的时间,当用户点击回退按钮： //1.webView.canGoBack()判断网页是否能后退,可以则goback() //2.如果不可以连续点击两次退出App,否则弹出提示Toast @Override public void onBackPressed() { if (webView.canGoBack()) { webView.goBack(); } else { if ((System.currentTimeMillis() - exitTime) > 2000) { Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show(); exitTime = System.currentTimeMillis(); } else { super.onBackPressed(); } } }}五、修改activy_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical"> <TextView android:layout_width="362dp" android:layout_height="wrap_content" android:text="请输入网址： " android:textSize="50px" android:textColor="@color/colorAccent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> <EditText android:layout_width="364dp" android:layout_height="wrap_content" android:id="@+id/editText" android:hint=" " /> <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开始访问" android:textSize="40px" android:textColor="@color/colorPrimaryDark"/> <Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Android学习教程" android:textColor="@color/colorPrimaryDark" android:textSize="30px" android:textAllCaps="false"/></LinearLayout>六、baidu_activity.xml

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".BaiduActivity"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> </android.support.design.widget.AppBarLayout> <include layout="@layout/content_baidu" /> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" app:srcCompat="@android:drawable/ic_dialog_email" /></android.support.design.widget.CoordinatorLayout>七、learn_activity.xml

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".LearnActivity"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> </android.support.design.widget.AppBarLayout> <include layout="@layout/content_learn" /> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" app:srcCompat="@android:drawable/ic_dialog_email" /></android.support.design.widget.CoordinatorLayout>八、androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.qiu.webview2"> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".BaiduActivity" android:label="@string/title_activity_baidu" android:theme="@style/AppTheme.NoActionBar" /> <activity android:name=".LearnActivity" android:label="@string/title_activity_learn" android:theme="@style/AppTheme.NoActionBar"></activity> </application></manifest>九、运行效果1、首页