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android webview处理404错误
来源:互联网   发布日期:2015-10-02 21:18:56   浏览:2050次  

导读:android webview处理404错误import java.io.IOException;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpHead;import org.ap......

android webview处理404错误

import java.io.IOException;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpHead;

import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.KeyEvent;

import android.webkit.WebView;

import android.webkit.WebViewClient;

public class WebView_404 extends Activity {

private final String HOMEPAGE = "http://10.0.0.95/index.html";//请求的网站的主页

private WebView web;

private Handler handler = new Handler() {

@Override

public void handleMessage(Message msg) {

if(msg.what==404) {//主页不存在

//载入本地assets文件夹下面的错误提示页面404.html

web.loadUrl("file:///android_asset/404.html");

} else {

web.loadUrl(HOMEPAGE);

}

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.webview_404);

web = (WebView) findViewById(R.id.WebView01);

web.getSettings().setJavaScriptEnabled(true);

web.setWebViewClient(new WebViewClient() {

@Override

public boolean shouldOverrideUrlLoading(WebView view, String url) {

if(url.startsWith("http://") && getRespStatus(url)==404) {

view.stopLoading();

//载入本地assets文件夹下面的错误提示页面404.html

view.loadUrl("file:///android_asset/404.html");

} else {

view.loadUrl(url);

}

return true;

}

});

new Thread(new Runnable() {

@Override

public void run() {

Message msg = new Message();

//此处判断主页是否存在,因为主页是通过loadUrl加载的,

//此时不会执行shouldOverrideUrlLoading进行页面是否存在的判断

//进入主页后,点主页里面的链接,链接到其他页面就一定会执行shouldOverrideUrlLoading方法了

if(getRespStatus(HOMEPAGE)==404) {

msg.what = 404;

}

handler.sendMessage(msg);

}

}).start();

}

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

if(keyCode==KeyEvent.KEYCODE_BACK && web.canGoBack()) {

web.goBack();

return false;

}

return super.onKeyDown(keyCode, event);

}

private int getRespStatus(String url) {

int status = -1;

try {

HttpHead head = new HttpHead(url);

HttpClient client = new DefaultHttpClient();

HttpResponse resp = client.execute(head);

status = resp.getStatusLine().getStatusCode();

} catch (IOException e) {}

return status;

}

}

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相关热词: 404错误 webview

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