android – 在启动另一个活动后单击Listview按钮完成或销毁活动

我有一个具有Listview的Activity ListActivity,另一个类Customlistadapter扩展了BaseAdapter.

ListActivity中的代码

customAdapter = new Customlistadapter(list);
TripList.setAdapter(customAdapter);

在Customlistadapter的getView()中,我膨胀了一个布局.有一个按钮,点击该按钮,我开始另一个活动.

我想在另一个活动开始后完成ListActivity.
使用以下代码我的应用程序正在崩溃.

((Activity) ctx).finish();

记录是

01-05 11:06:04.319: E/AndroidRuntime(4319): FATAL EXCEPTION: main
01-05 11:06:04.319: E/AndroidRuntime(4319): Process: com.example.myapp, PID: 4319
01-05 11:06:04.319: E/AndroidRuntime(4319): java.lang.NullPointerException
01-05 11:06:04.319: E/AndroidRuntime(4319):     at com.example.myapp.Customlistadapter$1.onClick(Customlistadapter.java:71)

请帮帮我.

解决方法:

首先,您可以发布您的Logcat.

FLAG_ACTIVITY_CLEAR_TOP

If set, and the activity being launched is already running in the
current task, then instead of launching a new instance of that
activity, all of the other activities on top of it will be closed and
this Intent will be delivered to the (Now on top) old activity as a
new Intent.

FLAG_ACTIVITY_NEW_TASK

if used to start the root activity of a task, it will bring any
currently running instance of that task to the foreground, and then
clear it to its root state.

您可以使用Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK

最后,它应该是,

   Intent intent = new Intent(ctx, NewActivityName.Class);
   intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |Intent.FLAG_ACTIVITY_NEW_TASK);
   intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
   startActivity(intent);