WebView加载网页（一）
WebView加载网页
一、新建一个android项目
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：
二、修改mainactivity
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
六、baidu_activity.xml
七、learn_activity.xml
八、androidmanifest.xml
九、运行效果
1、首页
2、百度页面
3、Android学习页面
转载于:https://blog.51cto.com/doublelinux/2344027