Android利用廣播監聽設備網絡連接(斷網)的變化情況
阿新 • • 發佈:2019-05-06
prot create 廣播 ast 例如 ews backup 聲明 flags
版權聲明: https://blog.csdn.net/lfdfhl/article/details/28588441
MainActivity例如以下:
NetWorkErrorActivity例如以下:
main.xml例如以下:
AndroidManifest.xml例如以下:
package cc.testnetworkchange; import android.os.Bundle; import android.app.Activity; /** * Demo描寫敘述: * 利用廣播監聽設備網絡連接的變化情況 * 亦可借此監測到設備是否已經斷開網絡 */ public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } }
NetWorkChangeBroadcastReceiver例如以下:
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; } } } //沒有運行return,則說明當前無網絡連接 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例如以下:
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例如以下:
<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="利用廣播監聽設備網絡連接的變化情況"
/>
</RelativeLayout>
AndroidManifest.xml例如以下:
<?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>
<!-- 註冊顯示錯誤的Activity-->
<activity android:name="cc.testnetworkchange.NetWorkErrorActivity"></activity>
<!-- 註冊廣播 -->
<receiver android:name="cc.testnetworkchange.NetWorkChangeBroadcastReceiver">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
</application>
</manifest>
Android利用廣播監聽設備網絡連接(斷網)的變化情況