從類與Android設備意圖接收

Question

我有延伸BroadCastReceiever和的onReceive方法的類如下：

public class Alarm extends BroadcastReceiver 
{ 
    @Override 
    public void onReceive(Context context, Intent intent) 
    { 
     String message = intent.getStringExtra("message2"); 
     Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); 
     Intent intent1 = new Intent(context, AlarmShow.class); 
     context.startActivity(intent1); 

    } 
} 

但每次崩潰，它運行的onReceive方法，而不是開始在意向活動的。

我試過幾乎所有東西。

任何幫助，將不勝感激。

感謝

編輯：logcat的錯誤：

11-25 18:24:00.511: D/AndroidRuntime(2158): Shutting down VM 
11-25 18:24:00.511: W/dalvikvm(2158): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
11-25 18:24:00.521: E/AndroidRuntime(2158): FATAL EXCEPTION: main 
11-25 18:24:00.521: E/AndroidRuntime(2158): java.lang.RuntimeException: Unable to start receiver com.example.androidalarm.Alarm: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.app.ActivityThread.handleReceiver(ActivityThread.java:1805) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.app.ActivityThread.access$2400(ActivityThread.java:117) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:981) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.os.Looper.loop(Looper.java:123) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at java.lang.reflect.Method.invoke(Method.java:507) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at dalvik.system.NativeStart.main(Native Method) 
11-25 18:24:00.521: E/AndroidRuntime(2158): Caused by: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.app.ContextImpl.startActivity(ContextImpl.java:621) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.content.ContextWrapper.startActivity(ContextWrapper.java:258) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.content.ContextWrapper.startActivity(ContextWrapper.java:258) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at com.example.androidalarm.Alarm.onReceive(Alarm.java:20) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  at android.app.ActivityThread.handleReceiver(ActivityThread.java:1794) 
11-25 18:24:00.521: E/AndroidRuntime(2158):  ... 10 more 
11-25 18:24:02.611: I/Process(2158): Sending signal. PID: 2158 SIG: 9 

Answer 1

測試信息不爲空，否則將有一個NullPointerException。 此外，如果你不使用這個下活動，您需要：

intent.addFlag(Intent.FLAG_ACTIVITY_NEW_TASK); 

或者你也會有暴跌。