判断当前网络是否可用

有两种方式

方式一，是否有网络（所有网络mobile、wifi）

public boolean  isNetWorkConnected() {ConnectivityManager  manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);return manager!=null&&(manager.getActiveNetworkInfo().isConnected());}

 

 

第二种方式，是否有指定的网络

检查wifi是否可用的两种方式

①

WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);boolean wifiEnabled = wifiManager.isWifiEnabled();if(wifiEnabled){//Wifi可用}else {//Wifi不可用}

 

②

/**

 * 判断WIFI是否连接

 * 

 * @param context

 * @return

 */

private static boolean isWIFIConnected(Context context) {

ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo info = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

if (info != null) {

return info.isConnected();

}

return false;

}

 

-------------------------------------------

package com.ithm.lottery17.util;

 

import com.ithm.lottery17.GloableParams;

 

import android.content.ContentResolver;

import android.content.Context;

import android.database.Cursor;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.net.Uri;

/**

 *  网络判断工具

 * @author Administrator

 *

 */

public class NetUtil {

 

private static final Uri PREFERRED_APN_URI = Uri.parse("content://telephony/carriers/preferapn");

 

/**

 * 判断网络 是否含有网络 是那种通信渠道

 * 

 * @return

 */

public static boolean cheackNet(Context context) {

// 判断wifi是否连接

boolean isWIFI = isWIFIConnected(context);

// 判断mobile apn是否可以连接

boolean isAPN = isMobileConnected(context);

// 如果均为false，提示用户设置网络

if (isAPN == false && isWIFI == false) {

// 提示用户设置网络

return false;

}

// 如果mobile apn为true，wap方式

if (isAPN) {

// wap方式，代理信息，ip和端口

// 获取到当前正在处于连接的那个方式

// 获取到正在处于连接的方式的代理信息（10.0.0.172 010.000.000.172）

setProxyInfo(context);

}

return true;

}

 

private static void setProxyInfo(Context context) {

ContentResolver contentResolver = context.getContentResolver();

// 获取到当前正在处于连接的那个方式

Cursor query = contentResolver.query(PREFERRED_APN_URI, null, null, null, null);

if (query != null && query.moveToNext()) {

GloableParams.PROXY_IP = query.getString(query.getColumnIndex("proxy"));

GloableParams.PROXY_PORT = query.getInt(query.getColumnIndex("port"));

}

}

 

/**

 * 判断WIFI是否连接

 * 

 * @param context

 * @return

 */

private static boolean isWIFIConnected(Context context) {

ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo info = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

if (info != null) {

return info.isConnected();

}

return false;

}

 

/**

 * 判断MOBILE是否连接

 * 

 * @param context

 * @return

 */

private static boolean isMobileConnected(Context context) {

ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo info = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

if (info != null) {

return info.isConnected();

}

return false;

}

//WIFI和MOBILE并存——手机厂商支持

}

------------------检查网络并提示用户设置网络------------

package com.example.networktest; import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.Uri;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.content.Intent;import android.database.Cursor;import android.view.View;import android.widget.Toast; public class MainActivity extends Activity { @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);} /** * 测试网络 * @param view */public void click1(View view) {ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);NetworkInfo info = manager.getActiveNetworkInfo();if(info!=null&&info.isConnected()){Toast.makeText(getApplicationContext(), "网络已连接", 1).show();}else {AlertDialog.Builder builder = new Builder(this);builder.setTitle("设置网络");builder.setMessage("网络错误，请检查网络设置");builder.setPositiveButton("设置网络", new OnClickListener() { @Overridepublic void onClick(DialogInterface dialog, int which) {//   <action android:name="android.intent.action.MAIN" />//                <action android:name="android.settings.WIRELESS_SETTINGS" />//                <action android:name="android.settings.AIRPLANE_MODE_SETTINGS" />//                <category android:name="android.intent.category.DEFAULT" />//                <category android:name="android.intent.category.VOICE_LAUNCH" />Intent intent = new Intent();intent.setAction("android.intent.action.MAIN");intent.setAction("android.settings.WIRELESS_SETTINGS");intent.setAction("android.settings.AIRPLANE_MODE_SETTINGS");intent.addCategory("android.intent.category.DEFAULT");intent.addCategory("android.intent.category.VOICE_LAUNCH");startActivity(intent); }});builder.setNegativeButton("取消", new OnClickListener() { @Overridepublic void onClick(DialogInterface dialog, int which) { }});builder.create();builder.show();}} /** * 测试wifi * @param view */public void click2(View view) {ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);NetworkInfo info = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);if(info!=null&&info.isConnected()) {Toast.makeText(getApplicationContext(), "wifi网络可用", 1).show();}else {AlertDialog.Builder builder = new Builder(MainActivity.this);builder.setTitle("wifi设置");builder.setMessage("wifi没有开启请设置wifi");builder.setNegativeButton("取消", new OnClickListener() { @Overridepublic void onClick(DialogInterface dialog, int which) { }});builder.setPositiveButton("设置wfifi", new OnClickListener() { @Overridepublic void onClick(DialogInterface dialog, int which) {Intent intent = new Intent();// <intent-filter>//                <action android:name="android.intent.action.MAIN" />//                <action android:name="android.settings.WIFI_SETTINGS" />//                <action android:name="android.net.wifi.PICK_WIFI_NETWORK" />//                <category android:name="android.intent.category.DEFAULT" />//                <category android:name="android.intent.category.VOICE_LAUNCH" />//                <category android:name="com.android.settings.SHORTCUT" />//            </intent-filter>intent.setAction("android.intent.action.MAIN");intent.setAction("android.settings.WIFI_SETTINGS");intent.setAction("android.net.wifi.PICK_WIFI_NETWORK");intent.addCategory("android.intent.category.DEFAULT");intent.addCategory("android.intent.category.VOICE_LAUNCH");intent.addCategory("com.android.settings.SHORTCUT");startActivity(intent);}});builder.show();}} /** * 测试Mobile * @param view */public void click3(View view) {ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo info = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);if(info!=null&&info.isConnected()) {Uri uri = Uri.parse("content://telephony/carriers/preferapn");Cursor cursor = getContentResolver().query(uri, null, null, null, null);if(cursor!=null&&cursor.moveToNext()) {Toast.makeText(getApplicationContext(), "当前是net方式", 1).show();}else {Toast.makeText(getApplicationContext(), "当前是wap方式", 1).show();}}} }