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();}}} }?
?