Android判断网络是否连接，跳转到设置页面以及判断连接的是什么网络

如果拟开发一个网络应用的程序，首先考虑是否接入网络，在Android手机中判断是否联网可以通过ConnectivityManager 类的isAvailable()方法判断，首先获取网络通讯类的实例 ConnectivityManager cwjManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);，使用cwjManager.getActiveNetworkInfo().isAvailable();
来返回是否有效，如果为True则表示当前Android手机已经联网，可能是WiFi或GPRS、HSDPA等等，具体的可以通过ConnectivityManager 类的getActiveNetworkInfo() 方法判断详细的接入方式，需要注意的是有关调用需要加入<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>这个权限，android开发网提醒大家在真机上Market和Browser程序都使用了这个方法，来判断是否继续，同时在一些网络超时的时候也可以检查下网络连接是否存在，以免浪费手机上的电力资源

判断网络是否连接资源地址：http://download.csdn.net/detail/u014649598/7966901

一、判断网络连接是否可用，不可用跳转到设置界面

@Override
protected void onStart() {
AlertDialog.Builder builder=new Builder(this);

//检查用户的网络情况
ConnectivityManager cm=(ConnectivityManager) MainActivity.this.getSystemService(Context.CONNECTIVITY_SERVICE);
//返回當前可用網絡信息

NetworkInfo info=cm.getActiveNetworkInfo();
if(info!=null&&info.isConnected()){
Toast.makeText(MainActivity.this, "网络可用", 0).show();

}else{
Toast.makeText(MainActivity.this, "网络不可用", 0).show();
builder.setTitle("提醒");
builder.setMessage("当前网络不可用，点击确定设置网络");
builder.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent=new Intent();
intent.setClassName("com.android.settings", "com.android.settings.Settings");
startActivity(intent);
}
}
);
builder.create().show();
}

super.onStart();
}

二、使用ConnectionChangeReceiver判断网络是否可用

public class MainActivity extends Activity {
private ConnectionChangeReceiver myReceiver;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//用广播判断
myReceiver=new ConnectionChangeReceiver();
this.registerReceiver(myReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
public class ConnectionChangeReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectivityManager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mobworkInfo = connectivityManager
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
NetworkInfo wifiworkInfo = connectivityManager
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
boolean IsNetConnected = mobworkInfo.isConnected();
boolean IsWifiConnected = wifiworkInfo.isConnected();
if(IsNetConnected || IsWifiConnected){
System.out.println("网络打开");
Log.e("wankai", "wankai");
boolean isConnected = true;
}else{
boolean isConnected = false;
System.out.println("网络关闭");
Log.e("wankai2", "wangguan");
}
}
}

}

三、判断GPS是否打开

public static boolean isGpsEnabled(Context context) {
LocationManager lm = ((LocationManager) context
.getSystemService(Context.LOCATION_SERVICE));
List<String> accessibleProviders = lm.getProviders(true);
return accessibleProviders != null && accessibleProviders.size() > 0;
}

四、判断WIFI是否打开

public static boolean isWifiEnabled(Context context) {
ConnectivityManager mgrConn = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
TelephonyManager mgrTel = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return ((mgrConn.getActiveNetworkInfo() != null && mgrConn
.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel
.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
}

五、判断是否是3G网络

public static boolean is3rd(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkINfo = cm.getActiveNetworkInfo();
if (networkINfo != null
&& networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {
return true;
}
return false;
}

六、判断是wifi还是3g网络,用户的体现性在这里了，wifi就可以建议下载或者在线播放。

public static boolean isWifi(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkINfo = cm.getActiveNetworkInfo();
if (networkINfo != null
&& networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {
return true;
}
return false;
}