Android 注销广播接收机
在我的应用程序中,我提供了一项服务,将广播接收器注册到Android 注销广播接收机,android,broadcastreceiver,android-service,onstart,Android,Broadcastreceiver,Android Service,Onstart,在我的应用程序中,我提供了一项服务,将广播接收器注册到onStart()方法: public void onStart() { if(something....) { IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON); filter.addAction(Intent.ACTION_SCREEN_OFF); screenReceiver = new ScreenRe
onStart()
方法:
public void onStart() {
if(something....) {
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
screenReceiver = new ScreenReceiver();
registerReceiver(screenReceiver, filter);
} else {
if(screenReceiver != null) {
unregisterReceiver(screenReceiver);
}
}
}
它工作正常。
但我将在中注销此BroadcastReceiver,否则
将收到此错误:
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): FATAL EXCEPTION: main
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): java.lang.RuntimeException: Unable to start service com.myservice.Service@460ce7d8 with Intent { cmp=com.myservice/.Service (has extras) }: java.lang.IllegalArgumentException: Receiver not registered: com.myreceiver.ScreenReceiver@46079370
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3063)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ActivityThread.access$3600(ActivityThread.java:125)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2096)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.os.Handler.dispatchMessage(Handler.java:99)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.os.Looper.loop(Looper.java:123)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at java.lang.reflect.Method.invokeNative(Native Method)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at java.lang.reflect.Method.invoke(Method.java:521)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at dalvik.system.NativeStart.main(Native Method)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.myreceiver.ScreenReceiver@46079370
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ActivityThread$PackageInfo.forgetReceiverDispatcher(ActivityThread.java:793)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:814)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:331)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at com.myservice.Service.onStart(Service.java:291)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.Service.onStartCommand(Service.java:420)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3053)
01-25 09:30:03.730: ERROR/AndroidRuntime(11748): ... 10 more
你能帮我吗?修改你的代码如下
public void onStart() {
if(something....) {
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
screenReceiver = new ScreenReceiver();
registerReceiver(screenReceiver, filter);
} else {
if(screenReceiver != null) {
unregisterReceiver(screenReceiver);
screenReceiver = null;
}
}
}
调用unregisterReceiver()不会将screenReceiver设置为null,并且当控件到达该块时,可能并不总是您的接收器已注册。
例如按顺序考虑,
如果(某物…
为真,则screenReceiver被实例化并注册如果(某物…
这次为假,则screenReceiver被取消注册如果(某物…
再次为false,此处,screenReceiver在步骤1中被实例化,因此其不为null,但在步骤2中被注销,因此出现异常“Receiver not registered:com.myreceiver”。ScreenReceiver@46079370“设置<代码>屏幕接收器<代码>为空,依次考虑以上3个步骤。它将正确执行。
按如下方式修改代码public void onStart() {
if(something....) {
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
screenReceiver = new ScreenReceiver();
registerReceiver(screenReceiver, filter);
} else {
if(screenReceiver != null) {
unregisterReceiver(screenReceiver);
screenReceiver = null;
}
}
}
调用unregisterReceiver()不会将screenReceiver设置为null,并且当控件到达该块时,可能并不总是您的接收器已注册。
例如按顺序考虑,
如果(某物…
为真,则screenReceiver被实例化并注册如果(某物…
这次为假,则screenReceiver被取消注册如果(某物…
再次为false,此处,screenReceiver在步骤1中被实例化,因此其不为null,但在步骤2中被注销,因此出现异常“Receiver not registered:com.myreceiver”。ScreenReceiver@46079370“设置<代码>屏幕接收器<代码>为空,依次考虑以上3个步骤。它将正确执行