标签:android style blog color io 使用 strong 文件 2014
第一步:接收状态信息
(1、写setActivity方法是为了获得界面的控件设定是否隐藏
2、此类继承BroadcastReceiver,作用是重新广播接收者)
import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.util.Log; import android.view.View; import android.widget.TextView; import android.widget.Toast; /** * Created by Administrator on 2014/9/2. */ public class ConnectionChangeReceiver extends BroadcastReceiver { public Activity activity; @Override public void onReceive(Context context, Intent intent) { boolean success = false; ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE);//获取状态对象 NetworkInfo.State state = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState(); // 判断是否正在使用WIFI网络 if (NetworkInfo.State.CONNECTED == state) { TextView view = (TextView) activity.findViewById(R.id.network); view.setVisibility(View.GONE); Log.e("-------wifi-----", "连接"); success = true; } // 获取GPRS网络连接状态 state = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState(); // 判断是否正在使用GPRS网络 if (NetworkInfo.State.CONNECTED == state) { TextView view = (TextView) activity.findViewById(R.id.network); view.setVisibility(View.GONE); Log.e("-------GPRS-----", "连接"); success = true; } if (!success) { Log.e("-------net-----", "无连接"); TextView view = (TextView) activity.findViewById(R.id.network); view.setVisibility(View.VISIBLE); Toast.makeText(context, "网络状态改变", Toast.LENGTH_LONG).show(); } } public void setActivity(Activity activity) { this.activity = activity; } }
第二步:创建对象,启动广播接收者:
ConnectionChangeReceiver receiver = new ConnectionChangeReceiver(this); this.registerReceiver(receiver,new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
第三步:在manifest中加上权限:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
作用是为了重新类ConnectionChangeReceiver中
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE);
能够获取对象。
第四步:布局文件
初始化显示无网络连接提醒时,默认为不可见状态,即Visibility为gone
第五步:方法的重用:
在广播接收者中加上一个改变activity的方法即可,而且不要带有构造函数,否者报错,见
第一步源码。
标签:android style blog color io 使用 strong 文件 2014
原文地址:http://www.cnblogs.com/ccddy/p/3965812.html