在开发中，遇到服务是24小时定时执行，需要在WiFi条件下上传，需要监听WiFi，在开定时器，持续刷新WiFi状态

WiFi监听：

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;


public class iswifi {
    public static boolean isWiFiActive(Context inContext) {
        Context context = inContext.getApplicationContext();
        ConnectivityManager connectivity = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivity != null) {
            NetworkInfo[] info = connectivity.getAllNetworkInfo();
            if (info != null) {
                for (int i = 0; i < info.length; i++) {
                    if (info[i].getTypeName().equals("WIFI") && info[i].isConnected()) {
                        return true;
                    }
                }
            }
        }
        return false;
    }
}

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private Runnable runnable;
    private Handler handler;
    private Runnable runnable1;
    private Handler handler1;
    private int flag = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //外部定时器
        handler1 = new Handler();
        runnable1 = new Runnable() {
            @Override
            public void run() {
                init();
                handler1.postDelayed(this,1000*60*60);
            }
        };
        handler1.postDelayed(runnable1,1000*5);


    }

    private void init() {
        //内部检查WiFi定时器
        handler = new Handler();
                runnable = new Runnable() {
                    @Override
                    public void run() {

                            if (iswifi.isWiFiActive(MyApplication.getContext())){
                                System.out.println("456");
                                handler.removeCallbacks(runnable);
                            }else {
                                System.out.println("789");
                                handler.postDelayed(this,1000*5);
                            }
                    }
                };
                handler.postDelayed(runnable,1000);
              //利用while实现，不用定时器
//            flag = 0;
//            while (flag == 0 || flag == 2){
//                if (iswifi.isWiFiActive(MyApplication.getContext())){
//                    System.out.println("456");
//                    flag = 1;
//                }else {
//                    System.out.println("789");
//                    flag = 2;
//                }
//            }
    }


}