判断Adndroid手机的网络连接状态
判断Adndroid手机的网络连接状态
判断手机的网络状态,需要使用ConnectivityManager。ConnectivityManager主要管理和网络连接相关的操作 。 相关的TelephonyManager则管理和手机、运营商等的相关信息;WifiManager则管理和wifi相关的信息。NetworkInfo类包含了对wifi和mobile两种网络模式连接的详细描述,通过其getState()方法获取的State对象则代表着连接成功与否等状态。
Java代码:
- package com.lenovo.test.network;
- import Android.app.Activity;
- import android.app.AlertDialog;
- import android.app.AlertDialog.Builder;
- import android.content.Context;
- import android.content.DialogInterface;
- import android.content.Intent;
- import android.net.ConnectivityManager;
- import android.net.NetworkInfo.State;
- import android.os.Bundle;
- import android.provider.Settings;
- import android.view.View;
- import android.widget.Button;
- import android.widget.TextView;
- public class JudgeNetworkActivity extends Activity {
- /** Called when the activity is first created. */
- private Button mButton = null;
- private TextView mTextView = null;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- mButton = (Button) findViewById(R.id.mbutton);
- mTextView = (TextView) findViewById(R.id.mtv);
- final Builder builder = new AlertDialog.Builder(this);
- mButton.setOnClickListener(new View.OnClickListener() {
- public void onClick(View v) {
- // TODO Auto-generated method stub
- ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
- // mobile 3G Data Network
- State mobile = conMan.getNetworkInfo(
- ConnectivityManager.TYPE_MOBILE).getState();
- // wifi
- State wifi = conMan.getNetworkInfo(
- ConnectivityManager.TYPE_WIFI).getState();
- mTextView.setText("Moble Network:" + mobile.toString() + "\n"
- + "WIFI Network:" + wifi.toString());
- // 如果3G网络和wifi网络都未连接,且不是处于正在连接状态 则进入Network Setting界面 由用户配置网络连接
- if (!(mobile == State.CONNECTED || mobile == State.CONNECTING
- || wifi == State.CONNECTED || wifi == State.CONNECTING)) {
- builder.setTitle("Message")
- .setMessage("没有可用的网络,请设置有效的网络连接!")
- .setNegativeButton("确定",
- new DialogInterface.OnClickListener() {
- public void onClick(
- DialogInterface dialog,
- int which) {
- startActivity(new Intent(
- Settings.ACTION_WIRELESS_SETTINGS));// 进入无线网络配置界面
- // startActivity(new
- // Intent(Settings.ACTION_WIFI_SETTINGS));
- // 进入手机中的wifi网络设置界面
- }
- }).show();
- }
- }
- });
- }
- }
在AndroidManifest.xml里添加权限:
- <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
运行结果:
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