android学习笔记(二) 动态注册广播例程

概述publicclassMainActivityextendsAppCompatActivity{privateNetworkStateChangeReceivernetworkStateChangeReceiver;@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setConten

public class MainActivity extends AppCompatActivity {    private NetworkStateChangeReceiver networkStateChangeReceiver;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        IntentFilter intentFilter = new IntentFilter();//创建IntentFilter实例        intentFilter.addAction("androID.net.conn.CONNECTIVITY_CHANGE");//添加action        networkStateChangeReceiver = new NetworkStateChangeReceiver();//创建NetwokrStateChangeReceiver实例        registerReceiver(networkStateChangeReceiver, intentFilter);//注册广播接收器    }    @OverrIDe    protected voID onDestroy() {        super.onDestroy();        unregisterReceiver(networkStateChangeReceiver);//动态注册的广播接收器需要取消注册    }    /**     * 定义NetworkStateChangeReceiver类,继承自broadcastReceiver     */    static class NetworkStateChangeReceiver extends broadcastReceiver {        @OverrIDe        public voID onReceive(Context context, Intent intent) {        	//You need to call getSystemService on a Context!!!            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();            if (networkInfo != null && networkInfo.isAvailable()) {                Toast.makeText(context, "networkInfo: is Available", Toast.LENGTH_SHORT).show();            } else {                Toast.makeText(context, "networkInfo: not Available", Toast.LENGTH_SHORT).show();            }        }    }}

需要在AndriodManifest.xml注册权限

<uses-permission androID:name="androID.permission.ACCESS_NETWORK_STATE" />

AndroIDStudio会自动提示,点击Add会自动添加

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