package cc.testnetworkchange;
import android.os.Bundle;
import android.app.Activity;
/**
* Demo描述:
* 利用广播监听设备网络连接的变化情况
* 亦可借此监测到设备是否已经断开网络
*/
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
NetWorkChangeBroadcastReceiver如下:
package cc.testnetworkchange;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.NetworkInfo.State;
public class NetWorkChangeBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectivityManager=
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivityManager!=null) {
NetworkInfo [] networkInfos=connectivityManager.getAllNetworkInfo();
for (int i = 0; i < networkInfos.length; i++) {
State state=networkInfos[i].getState();
if (NetworkInfo.State.CONNECTED==state) {
System.out.println("------------> Network is ok");
return;
}
}
}
//没有执行return,则说明当前无网络连接
System.out.println("------------> Network is validate");
intent.setClass(context, NetWorkErrorActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
}
NetWorkErrorActivity如下:
package cc.testnetworkchange;
import android.os.Bundle;
import android.app.Activity;
public class NetWorkErrorActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.networkerror);
}
}
main.xml如下:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="利用广播监听设备网络连接的变化情况"
/>
</RelativeLayout>
AndroidManifest.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cc.testnetworkchange"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="8" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="cc.testnetworkchange.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- 注册显示错误的Activity-->
<activity android:name="cc.testnetworkchange.NetWorkErrorActivity"></activity>
<!-- 注册广播 -->
<receiver android:name="cc.testnetworkchange.NetWorkChangeBroadcastReceiver">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
</application>
</manifest>