android中webview加载网页,为什么有的网站会被加载两次
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这是正常加载的代码。你可以核对参考一下。
package com.example.webview;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends Activity
{
private WebView webview;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webview = (WebView) findViewById(R.id.webview);
WebSettings webSettings = webview.getSettings();
//设置WebView属性,能够执行Javascript脚本
webSettings.setJavaScriptEnabled(true);
//设置可以访问文件
webSettings.setAllowFileAccess(true);
//设置支持缩放
webSettings.setBuiltInZoomControls(true);
//加载需要显示的网页
webview.loadUrl("baidu.com");
//设置Web视图
webview.setWebViewClient(new webViewClient ());
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
//设置回退
//覆盖Activity类的onKeyDown(int keyCoder,KeyEvent event)方法
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack(); //goBack()表示返回WebView的上一页面
return true;
}
finish();//结束退出程序
return false;
}
//Web视图
private class webViewClient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
}
package com.example.webview;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends Activity
{
private WebView webview;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webview = (WebView) findViewById(R.id.webview);
WebSettings webSettings = webview.getSettings();
//设置WebView属性,能够执行Javascript脚本
webSettings.setJavaScriptEnabled(true);
//设置可以访问文件
webSettings.setAllowFileAccess(true);
//设置支持缩放
webSettings.setBuiltInZoomControls(true);
//加载需要显示的网页
webview.loadUrl("baidu.com");
//设置Web视图
webview.setWebViewClient(new webViewClient ());
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
//设置回退
//覆盖Activity类的onKeyDown(int keyCoder,KeyEvent event)方法
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack(); //goBack()表示返回WebView的上一页面
return true;
}
finish();//结束退出程序
return false;
}
//Web视图
private class webViewClient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
}
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