android 判断网络状态 (无网络 wifi 数据流量)

/**
* 检测网络是否连接
* @return
*/
private boolean checkNetworkState() {
boolean flag = false;
//得到网络连接信息
manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
//去进行判断网络是否连接
if (manager.getActiveNetworkInfo() != null) {
flag = manager.getActiveNetworkInfo().isAvailable();
}
if (!flag) {
setNetwork();
} else {
isNetworkAvailable();
}

return flag;
}

/**
* 网络未连接时，调用设置方法
*/
private void setNetwork(){
Toast.makeText(this, "wifi is closed!", Toast.LENGTH_SHORT).show();

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(R.drawable.ic_launcher);
builder.setTitle("网络提示信息");
builder.setMessage("网络不可用，如果继续，请先设置网络！");
builder.setPositiveButton("设置", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = null;
/**
* 判断手机系统的版本！如果API大于10 就是3.0+
* 因为3.0以上的版本的设置和3.0以下的设置不一样，调用的方法不同
*/
if (android.os.Build.VERSION.SDK_INT > 10) {
intent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);
} else {
intent = new Intent();
ComponentName component = new ComponentName(
"com.android.settings",
"com.android.settings.WirelessSettings");
intent.setComponent(component);
intent.setAction("android.intent.action.VIEW");
}
startActivity(intent);
}
});

builder.setNegativeButton("取消", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {

}
});
builder.create();
builder.show();
}

/**
* 网络已经连接，然后去判断是wifi连接还是GPRS连接
* 设置一些自己的逻辑调用
*/
private void isNetworkAvailable(){

State gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
if(gprs == State.CONNECTED || gprs == State.CONNECTING){
Toast.makeText(this, "wifi is open! gprs", Toast.LENGTH_SHORT).show();
}
//判断为wifi状态下才加载广告，如果是GPRS手机网络则不加载！
if(wifi == State.CONNECTED || wifi == State.CONNECTING){
Toast.makeText(this, "wifi is open! wifi", Toast.LENGTH_SHORT).show();
loadAdmob();
}

}

/**
* 在wifi状态下 加载admob广告
*/
private void loadAdmob(){
ll = (LinearLayout) findViewById(R.id.load_ads);
ll.removeAllViews();
adsView = new AdView(this, AdSize.BANNER, "a15194a1ac9505d");
ll.addView(adsView);

adsView.loadAd(new AdRequest());
}