android 登录前检查网络状态

来源：互联网发布：爱live软件破解编辑：程序博客网时间：2024/04/29 05:51

http://1002878825-qq-com.iteye.com/blog/1194801

Java代码  

package com.dx;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.NetworkInfo.State;
import android.os.Bundle;
import android.widget.TextView;
public class Main extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);
TextView textView = new TextView(this);
textView.setText("网络检测");
setContentView(textView);
if(checkNetWorkInfo()){
goToNetWork();
};
}
private boolean goToNetWork() {
// TODO Auto-generated method stub
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if(info == null || !info.isAvailable()){
new AlertDialog.Builder(this).setMessage("没有可以使用的网络").setPositiveButton("Ok", null).show();
return false;
}
else{
new AlertDialog.Builder(this).setMessage("网络正常可以使用").setPositiveButton("Ok", null).show();
return true;
}
}
private boolean checkNetWorkInfo() {
// TODO Auto-generated method stub
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
if(wifi != null){
new AlertDialog.Builder(this).setMessage(wifi.toString()).setPositiveButton("wifi", null).show();//显示wifi网络连接状态
return true;
}else{
State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
if(mobile != null){
new AlertDialog.Builder(this).setMessage(mobile.toString()).setPositiveButton("3G", null).show();//显示3G网络连接状态
return true;
}
}
return false;
}
}

在手机应用与网络交互数据的时候,我们首先要判断有没有可用的网络，如果没有则跳到相应的网络设置页面，方法详见代码：

private boolean CheckNetwork() {       boolean flag = false;       ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);       if (cwjManager.getActiveNetworkInfo() != null)           flag = cwjManager.getActiveNetworkInfo().isAvailable();       if (!flag) {           Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络").setMessage("请开启GPRS或WIFI网络连接");           b.setPositiveButton("确定", new DialogInterface.OnClickListener() {               public void onClick(DialogInterface dialog, int whichButton) {                   Intent mIntent = new Intent("/");                   ComponentName comp = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");                   mIntent.setComponent(comp);                   mIntent.setAction("android.intent.action.VIEW");                   startActivity(mIntent);               }           }).setNeutralButton("取消", new DialogInterface.OnClickListener() {               public void onClick(DialogInterface dialog, int whichButton) {                   dialog.cancel();               }           }).create();           b.show();       }        return flag;   }