android - 问题添加 Android 对话框

Question

所以我目前正在开发一个基本的 Activity 组织者，它将为 session 存储事件并允许用户存储他们感兴趣的事件。

但是我遇到了问题，因为我想为每个按下的按钮添加一个对话框，以便它显示事件信息并为用户提供是否要添加的选项。

我在代码中遇到的问题如下，在点击时发生。

android.view.WindowManager$BadTokenException:无法添加窗口 -- token null 不适用于应用程序

下面是显示在屏幕上的事件按钮本身的代码

   public class EventButton extends Button
{
    public Button button = this;
    public Event event;
    public String eventHost;
    public String eventName;
    public String eventLocation;
    public Calendar eventDate;
    private LinearLayout screen;

    public EventButton(Context context , Event pEvent){
        super(context);
        eventDate = pEvent.eventDate;
        eventName = pEvent.eventName;
        eventHost = pEvent.eventHost;
        eventLocation = pEvent.eventLocation;
        event = pEvent;
        setOnClick();

        this.setText(eventName + "\n " + eventHost);
    }

     public void setOnClick() {
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {



                int timeTilEvent =getTimeDifference();
                int day = eventDate.get(eventDate.DAY_OF_MONTH);
                int month=eventDate.get(eventDate.MONTH);
                int year=eventDate.get(eventDate.YEAR);
                int hour=eventDate.get(eventDate.HOUR_OF_DAY);
                int minute=eventDate.get(eventDate.MINUTE);
                String minutestring=""+ minute;

                if(minutestring.length()==1){
                    minutestring = "0"+minute;
                }
                String dateOutput= day + "/" + month +"/" + year + "\n " + hour + ":" + minutestring;

                AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
                builder.setMessage("Event:" + eventName + "\n Host:" + eventHost + "\n Location: " + eventLocation + "\n When: " + dateOutput);
                builder.setTitle("do you wish to add this event to your watch list?");

                if(!FileManager.eventList.contains(event)) {
                    builder.setPositiveButton("add interest", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            FileManager.writeToFile(new Event(eventHost, eventName, eventLocation, eventDate), getContext());
                            FileManager.readFromFile(getContext());
                        }
                    });
                }
                else if(FileManager.eventList.contains(event)) {
                    builder.setPositiveButton("remove interest", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            FileManager.eventList.remove(event);
                            FileManager.writeToFile(new Event(eventHost, eventName, eventLocation, eventDate), getContext());
                            FileManager.readFromFile(getContext());
                        }
                    });
                }

                builder.setPositiveButton("cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                    }
                });

                AlertDialog dialog = builder.create();
                dialog.show();

主类(显示按钮是如何创建的)

  public class MainActivity extends AppCompatActivity {

    public Calendar setupDate(int year, int month, int day , int hour, int minute){
        return new GregorianCalendar(year,month,day,hour,minute);
    }    

    ArrayList<EventButton> buttons = new ArrayList<EventButton>();

    public void addButtonToList(String pHost, String pName,String pEventLocation, Calendar pDate){
        Event event = new Event(pHost, pName, pEventLocation, pDate);
        buttons.add(new EventButton(getBaseContext(),event));
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.content_main);

        addButtonToList("Host ", " Event", "location", setupDate(2016, 04, 03, 10, 00));
       addButtonToList("Host ", " Event", "location", setupDate(2016, 04, 03, 10, 00));



        LinearLayout ll = (LinearLayout) findViewById(R.id.LinearLayout1);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(ActionBar.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

        for(int count=0;count < buttons.size();count++){
            if(buttons.get(count) != null) {
                buttons.get(count).AddButtonToScreen(ll, lp);
            }
        }



        }

非常感谢任何帮助，谢谢

(目录输出，如果有人感兴趣或需要的话)

    04-03 18:26:20.267 4335-4335/? E/Zygote: v2
04-03 18:26:20.267 4335-4335/? I/libpersona: KNOX_SDCARD checking this for 10160
04-03 18:26:20.267 4335-4335/? I/libpersona: KNOX_SDCARD not a persona
04-03 18:26:20.267 4335-4335/? I/SELinux: Function: selinux_compare_spd_ram , priority [2] , priority version is VE=SEPF_SM-G361F_5.1.1_0043
04-03 18:26:20.267 4335-4335/? E/SELinux: [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
04-03 18:26:20.277 4335-4335/? I/art: Late-enabling -Xcheck:jni
04-03 18:26:20.287 4335-4335/? D/TimaKeyStoreProvider: in addTimaSignatureService
04-03 18:26:20.307 4335-4335/? D/TimaKeyStoreProvider: TimaSignature is unavailable
04-03 18:26:20.307 4335-4335/? D/ActivityThread: Added TimaKesytore provider
04-03 18:26:20.307 4335-4335/? I/SAMP: ActivityThread() - SAMP_ENABLE : true
04-03 18:26:20.357 4335-4335/com.example.daniel.myapplication D/ContextImpl: ContextImpl running for user UserHandle{0} 0
04-03 18:26:20.367 4335-4335/com.example.daniel.myapplication D/ContextImpl: ContextImpl running for user UserHandle{0} 0
04-03 18:26:20.367 4335-4335/com.example.daniel.myapplication W/ResourcesManager: getTopLevelResources: null for user  0
04-03 18:26:20.437 4335-4335/com.example.daniel.myapplication D/ContextImpl: ContextImpl running for user UserHandle{0} 0
04-03 18:26:20.447 4335-4335/com.example.daniel.myapplication D/ContextImpl: ContextImpl running for user UserHandle{0} 0
04-03 18:26:20.447 4335-4335/com.example.daniel.myapplication W/ResourcesManager: getTopLevelResources: null for user  0
04-03 18:26:20.447 4335-4335/com.example.daniel.myapplication W/ResourcesManager: getTopLevelResources: null for user  0
04-03 18:26:20.457 4335-4335/com.example.daniel.myapplication D/DisplayManager: DisplayManager()
04-03 18:26:20.497 4335-4335/com.example.daniel.myapplication D/PhoneWindow: *FMB* installDecor mIsFloating : false
04-03 18:26:20.497 4335-4335/com.example.daniel.myapplication D/PhoneWindow: *FMB* installDecor flags : -2139029248
04-03 18:26:20.557 4335-4398/com.example.daniel.myapplication D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
04-03 18:26:20.577 4335-4335/com.example.daniel.myapplication D/PhoneWindow: *FMB* isFloatingMenuEnabled mFloatingMenuBtn : null
04-03 18:26:20.577 4335-4335/com.example.daniel.myapplication D/PhoneWindow: *FMB* isFloatingMenuEnabled return false
04-03 18:26:20.627 4335-4398/com.example.daniel.myapplication I/OpenGLRenderer: Initialized EGL, version 1.4
04-03 18:26:20.627 4335-4398/com.example.daniel.myapplication D/GC: <tid=4398> OES20 ===> GC Version   : GC version rls_5011p6_GC5.5.14 
04-03 18:26:20.637 4335-4398/com.example.daniel.myapplication D/OpenGLRenderer: Enabling debug mode 0
04-03 18:26:20.757 4335-4335/com.example.daniel.myapplication W/IInputConnectionWrapper: showStatusIcon on inactive InputConnection
04-03 18:26:20.757 4335-4335/com.example.daniel.myapplication I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@25ba99d time:70384960
04-03 18:26:32.137 4335-4335/com.example.daniel.myapplication I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@25ba99d time:70396347
04-03 18:26:33.527 4335-4335/com.example.daniel.myapplication D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
04-03 18:26:33.647 4335-4335/com.example.daniel.myapplication D/PhoneWindow: *FMB* installDecor mIsFloating : true
04-03 18:26:33.647 4335-4335/com.example.daniel.myapplication D/PhoneWindow: *FMB* installDecor flags : 8388610
04-03 18:26:33.687 4335-4335/com.example.daniel.myapplication D/AndroidRuntime: Shutting down VM
04-03 18:26:33.687 4335-4335/com.example.daniel.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                Process: com.example.daniel.myapplication, PID: 4335
                                                                                android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
                                                                                    at android.view.ViewRootImpl.setView(ViewRootImpl.java:578)
                                                                                    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:282)
                                                                                    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
                                                                                    at android.app.Dialog.show(Dialog.java:298)
                                                                                    at com.example.daniel.myapplication.EventButton$1.onClick(EventButton.java:195)
                                                                                    at android.view.View.performClick(View.java:5076)
                                                                                    at android.view.View$PerformClick.run(View.java:20279)
                                                                                    at android.os.Handler.handleCallback(Handler.java:739)
                                                                                    at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                    at android.os.Looper.loop(Looper.java:135)
                                                                                    at android.app.ActivityThread.main(ActivityThread.java:5910)
                                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                                    at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)

Answer 1

当您应该使用 Activity Context 时，您却在使用 Base Context。

不使用 getBaseContext()，只需将 this 用于 Activity Context:

public void addButtonToList(String pHost, String pName,String pEventLocation, Calendar pDate){
    Event event = new Event(pHost, pName, pEventLocation, pDate);
    buttons.add(new EventButton(this, event));
}