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android - 无法实例化接收器,java.lang.ClassCastException

转载 作者:太空狗 更新时间:2023-10-29 12:48:56 25 4
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Problem: AutoStart On Boot Up causing classcastexception.. 

I am doing Location based application , I want to run the app whenever the phone bootup,So that my app will be running continuously, I just want to start the service as soon as the phone loads all the service.

我已经编写了广播接收器方法,并且在 mainfest xml 中甚至设置了接收器和权限 我正在编写以下代码,但出现运行时错误,我什至尝试删除 Activity 并运行但它导致了错误。请给我一些解决方案。

MainFest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.omkar_gpslocation"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.BATTERY_STATS" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.omkar_gpslocation.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>
<activity
android:name="com.example.omkar_gpslocation.Activity_Settings"
android:label="@string/title_activity_activity__settings" >
</activity>


<receiver android:enabled="true" android:name="com.example.omkar_gpslocation.MainActivity"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED">

<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
</application>

</manifest>

主 Activity

private BroadcastReceiver MyReceiver= new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Intent serviceIntent = new Intent("com.example.omkar_gpslocation");
context.startService(serviceIntent);

}
};

日志:

02-04 13:21:08.462: E/AndroidRuntime(503): FATAL EXCEPTION: main
02-04 13:21:08.462: E/AndroidRuntime(503): java.lang.RuntimeException: Unable to instantiate receiver com.example.omkar_gpslocation.MainActivity: java.lang.ClassCastException: com.example.omkar_gpslocation.MainActivity
02-04 13:21:08.462: E/AndroidRuntime(503): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1873)
02-04 13:21:08.462: E/AndroidRuntime(503): at android.app.ActivityThread.access$2400(ActivityThread.java:155)
02-04 13:21:08.462: E/AndroidRuntime(503): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1049)
02-04 13:21:08.462: E/AndroidRuntime(503): at android.os.Handler.dispatchMessage(Handler.java:130)
02-04 13:21:08.462: E/AndroidRuntime(503): at android.os.Looper.loop(SourceFile:351)
02-04 13:21:08.462: E/AndroidRuntime(503): at android.app.ActivityThread.main(ActivityThread.java:3820)
02-04 13:21:08.462: E/AndroidRuntime(503): at java.lang.reflect.Method.invokeNative(Native Method)
02-04 13:21:08.462: E/AndroidRuntime(503): at java.lang.reflect.Method.invoke(Method.java:538)
02-04 13:21:08.462: E/AndroidRuntime(503): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:969)
02-04 13:21:08.462: E/AndroidRuntime(503): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:727)
02-04 13:21:08.462: E/AndroidRuntime(503): at dalvik.system.NativeStart.main(Native Method)
02-04 13:21:08.462: E/AndroidRuntime(503): Caused by: java.lang.ClassCastException: com.example.omkar_gpslocation.MainActivity
02-04 13:21:08.462: E/AndroidRuntime(503): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1864)
02-04 13:21:08.462: E/AndroidRuntime(503): ... 10 more

最佳答案

您必须在自己的类中编写接收器。不要将其写为 Activity 中的字段。

如果你想在 Manifest 文件中注册一个接收器,它必须在它自己的文件中。在新文件中创建一个扩展 BroadcastReceiver 的新类。然后在 list 中使用此类的名称作为接收者名称,而不是 MainActivity。

关于android - 无法实例化接收器,java.lang.ClassCastException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14682591/

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