Android app中实现网络监听

系统管理员 2022-06-13 10:11 316阅读 0赞

*  **创建BroadcastReceiver**
 *  **Manifest中注册**
 *  **NetWorkUtil**
 *  **\*ApplicationContex**

## BroadcastReceiver ##

首先创建一个BroadcastReceiver:

public class NetWorkChangeBroadcasetReceiver extends BroadcastReceiver { 
        @Override
        public void onReceive(Context context, Intent intent) {
    
             //ApplicationContext.getApplication()是自己写的一个，主要是为了获取Application，这里使用了弱引用
            if (!NetWorkUtil.isConnected(ApplicationContext.getApplication())) {
                //做你想做的事,弹出对话框提示用都可以
                ToastUtils.showLong(context, R.string.local_network_error);
            }
        }
    
    }

## Mmanifest中注册 ##

监听网络变化

## NetWorkUtil ##

网络是否连接

public static boolean isConnected(Context context) {
    
            ConnectivityManager conMan = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetInfo = conMan.getActiveNetworkInfo();
            boolean connect = false;
            try {
                connect = activeNetInfo.isConnected();
            } catch (Exception e) {
            }
            return connect;
        }

## ApplicationContext ##

获取Application的弱引用对象，在Application中初始化

public class ApplicationContext { 
    
        private static final String TAG = "App.ApplicationContext";
    
        private static WeakReference<Application> sApplicationWeakRef;
        private static WeakReference<Context> sCurrContextWeakRef;
    
        public static Application getApplication() {
            return sApplicationWeakRef != null ? sApplicationWeakRef.get() : null;
        }
    
        public static void setApplication(Application application) {
            if (application == null) {
                ApplicationContext.sApplicationWeakRef = null;
                return;
            }
            ApplicationContext.sApplicationWeakRef = new WeakReference<Application>(application);
        }
    
        public static Context getCurrentContext() {
            return sCurrContextWeakRef != null ? sCurrContextWeakRef.get() : null;
        }
    
        public static void setCurrentContext(Context context) {
            if (context == null) {
                ApplicationContext.sCurrContextWeakRef = null;
                return;
            }
            ApplicationContext.sCurrContextWeakRef = new WeakReference<Context>(context);
        }
    
        public static Context getContext() {
            Context c = getCurrentContext();
            if (c == null) {
                Log.e(TAG, "ApplicationContext's currentContext is null.");
                c = getApplication();
            }
            return c;
        }
    
        /** * 不知道为什么?返回的是"@MAIN" * @param context * @param pid * @return */
        public static String getPidKey(Context context, int pid) {
            // TODO: 16/3/8 albieliang 
            return "@MAIN";
        }
    }

通过上面这个的一个方式就可以实现app中的网络监听