android – 调用onDestroy函数时,Receiver未注册错误

概述当我创建扩展BrodcastReceiver并注册它的类时. 错误无法销毁活动,Receiver未注册：MainActivity中的null onDestroy()函数调用unregisterReceiver时. 的onCreate()： ConnectionChangeReceiver connectionChangeReceiver = new ConnectionChangeReceiver 当我创建扩展brodcastReceiver并注册它的类时.
错误无法销毁活动,Receiver未注册：MainActivity中的null onDestroy()函数调用unregisterReceiver时.

的onCreate()：

ConnectionChangeReceiver connectionChangeReceiver = new ConnectionChangeReceiver();IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);registerReceiver(connectionChangeReceiver,filter);

的onDestroy()：

@OverrIDeprotected voID onDestroy() {    Log.v("YourActivity","onDestroy");    unregisterReceiver(connectionChangeReceiver);    super.onDestroy();}

ConnectionChangeReceiver类：

public class ConnectionChangeReceiver extends broadcastReceiver{    @OverrIDe    public voID onReceive( Context context,Intent intent )    {        Toast.makeText(context,"CONN",Toast.LENGTH_SHORT).show();    }}

manifest：UPDATE：添加< action androID：name =“androID.net.conn.CONNECTIVITY_CHANGE”/>

<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"package="com.example.mamrezo.mapapp" ><uses-permission androID:name="androID.permission.INTERNET" /><uses-permission androID:name="androID.permission.ACCESS_NETWORK_STATE" /><uses-permission androID:name="androID.permission.WRITE_EXTERNAL_STORAGE" /><application    androID:allowBackup="true"    androID:icon="@drawable/ic_launcher"    androID:label="@string/app_name"    androID:theme="@style/Apptheme" >    <activity        androID:name="com.example.mamrezo.mapapp.MainActivity"        androID:label="@string/app_name"        androID:theme="@style/Apptheme" >        <intent-filter>            <action androID:name="androID.intent.action.MAIN" />            <category androID:name="androID.intent.category.LAUNCHER" />        </intent-filter>    </activity>    <receiver androID:name=".ConnectionChangeReceiver" >        <intent-filter>            <action androID:name="androID.net.conn.CONNECTIVITY_CHANGE" />        </intent-filter>    </receiver></application></manifest>

解决方法 我总是在onStart中注册接收器并在onStop中注销它.我知道这个归功于这个答案： https://stackoverflow.com/a/24391706/1203797

如果它仍然无法正常工作,只需wrapunregisterReceiver(connectionChangeReceiver);一个try-catch块就是答案,正如我在上面发布的链接中所述.

或者您可以在清单中注册它,例如：

<receiver androID:name=".ConnectionChangeReceiver" >        <intent-filter>            <action androID:name="androID.intent.action.BOOT_COMPLETED" />        </intent-filter>    </receiver>

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