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我目前有一个项目,其中主要活动将启动另一个信息收集活动,然后返回到主要活动。我正在尝试处理后退按钮。每次执行下面的代码,它都会崩溃。但我不明白为什么。安卓后退按钮处理
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
finish();
return true;
}
return super.onKeyDown(keyCode, event);
};
我也曾尝试:
@Override
public void onBackPressed() {
finish();
};
堆栈跟踪:
09-14 15:30:13.740: E/AndroidRuntime(32400): FATAL EXCEPTION: main
09-14 15:30:13.740: E/AndroidRuntime(32400): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=2, result=0, data=null} to activity {peaBerry.Shopping.Consultant/peaBerry.Shopping.Consultant.PeaBerryTeaActivity}: java.lang.NullPointerException
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.ActivityThread.deliverResults(ActivityThread.java:2655)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.ActivityThread.handleSendResult(ActivityThread.java:2697)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.ActivityThread.access$2000(ActivityThread.java:124)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:998)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.os.Handler.dispatchMessage(Handler.java:99)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.os.Looper.loop(Looper.java:130)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.ActivityThread.main(ActivityThread.java:3806)
09-14 15:30:13.740: E/AndroidRuntime(32400): at java.lang.reflect.Method.invokeNative(Native Method)
09-14 15:30:13.740: E/AndroidRuntime(32400): at java.lang.reflect.Method.invoke(Method.java:507)
09-14 15:30:13.740: E/AndroidRuntime(32400): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
09-14 15:30:13.740: E/AndroidRuntime(32400): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
09-14 15:30:13.740: E/AndroidRuntime(32400): at dalvik.system.NativeStart.main(Native Method)
09-14 15:30:13.740: E/AndroidRuntime(32400): Caused by: java.lang.NullPointerException
09-14 15:30:13.740: E/AndroidRuntime(32400): at peaBerry.Shopping.Consultant.PeaBerryTeaActivity.onActivityResult(PeaBerryTeaActivity.java:312)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.Activity.dispatchActivityResult(Activity.java:3958)
09-14 15:30:13.740: E/AndroidRuntime(32400): at android.app.ActivityThread.deliverResults(ActivityThread.java:2651)
此代码位于从主要活动启动的第二个活动中。澄清 – Orthmius
为什么不使用onBackPressed()? –
“It break”?怎么样?它会崩溃吗?它什么都不做?你的计算机解体了吗? – Eric