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在打开App进入程序时,一般都会进行网络请求数据,但如果手机没有联网怎么办?总不能什么都不显示吧,然后用户又连接上网络了,这个时候我们应该继续网络请求吧,所以我们应该实时的监听手机的网络.
先简单说一下思路：网络变化时系统会发出广播。所以我们监听这个广播，利用接口回调通知activity做相应的操作就好了。。
步骤：
1、写个判断网络的工具类.
2、先写个类继承BroadcastReceiver。（不要忘记在清单文件中注册）需要在清单文件中添加权限<uses-permission
android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
3、写个回调接口
4、beasActivity实现这个接口
1.判断网络工具类
public class NetUtil {
/**
* 没有连接网络
*/
public static final int NETWORK_NONE = -1;
/**
* 移动网络
*/
public static final int NETWORK_MOBILE = 0;
/**
* 无线网络
*/
public static final int NETWORK_WIFI = 1;
public static int getNetWorkState(Context context) {
// 得到连接管理器对象
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {
if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_WIFI)) {
return NETWORK_WIFI;
} else if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_MOBILE)) {
return NETWORK_MOBILE;
}
} else {
return NETWORK_NONE;
}
return NETWORK_NONE;
}
}
2.继承BroadcastReceiver监听网络的广播 public class NetBroadcastReceiver extends BroadcastReceiver {
public NetEvevt evevt = BaseActivity.evevt;
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
int netWorkState = NetUtil.getNetWorkState(context);
// 接口回调传过去状态的类型
evevt.onNetChange(netWorkState);
}
}
// 自定义接口
public interface NetEvevt {
public void onNetChange(int netMobile);
}
}
3.beasActivity实现这个接口 public class BaseActivity extends Activity implements NetBroadcastReceiver.NetEvevt {
public static NetBroadcastReceiver.NetEvevt evevt;
/**
* 网络类型
*/
private int netMobile;
@Override
protected void onCreate(Bundle arg0) {
// TODO Auto-generated method stub
super.onCreate(arg0);
evevt = this;
inspectNet();
}
/**
* 初始化时判断有没有网络
*/
public boolean inspectNet() {
this.netMobile = NetUtil.getNetWorkState(BaseActivity.this);
if (netMobile == NetUtil.NETWORK_WIFI) {
System.out.println("inspectNet：连接wifi");
} else if (netMobile == NetUtil.NETWORK_MOBILE) {
System.out.println("inspectNet:连接移动数据");
} else if (netMobile == NetUtil.NETWORK_NONE) {
System.out.println("inspectNet:当前没有网络");
}
return isNetConnect();
}
/**
* 网络变化之后的类型
*/
@Override
public void onNetChange(int netMobile) {
// TODO Auto-generated method stub
this.netMobile = netMobile;
isNetConnect();
}
/**
* 判断有无网络 。
*
* @return true 有网, false 没有网络.
*/
public boolean isNetConnect() {
if (netMobile == NetUtil.NETWORK_WIFI) {
return true;
} else if (netMobile == NetUtil.NETWORK_MOBILE) {
return true;
} else if (netMobile == NetUtil.NETWORK_NONE) {
return false;
}
return false;
}
}
4. public class MainActivity extends BaseActivity {
private TextView mTv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTv= (TextView) findViewById(R.id.textView);
//启动时判断网络状态
boolean netConnect = this.isNetConnect();
if (netConnect){
mTv.setVisibility(View.GONE);
}else {
mTv.setVisibility(View.VISIBLE);
} //点击跳转到设置wifi
findViewById(R.id.textView).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// setWifi1();
// setWifi2();
// setWifi3();
setWifi4();
}
});
}
private void setWifi4() {
Intent i = new Intent();
if (android.os.Build.VERSION.SDK_INT >= 11) {
//Honeycomb
i.setClassName("com.android.settings", "com.android.settings.Settings$WifiSettingsActivity");
} else {
//other versions
i.setClassName("com.android.settings"
, "com.android.settings.wifi.WifiSettings");
}
startActivity(i);
}
private void setWifi3() {
startActivity(new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS));
}
private void setWifi2() {
Intent intent = new Intent();
intent.setAction("android.net.wifi.PICK_WIFI_NETWORK");
startActivity(intent);
}
private void setWifi1() {
Intent wifiSettingsIntent = new Intent("android.settings.WIFI_SETTINGS");
startActivity(wifiSettingsIntent);
}
@Override public void onNetChange(int netMobile) { super.onNetChange(netMobile); //网络状态变化时的操作 if (netMobile==NetUtil.NETWORK_NONE){ mTv.setVisibility(View.VISIBLE); }else { mTv.setVisibility(View.GONE); } } }
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