我有一个包含复选框的PreferenceActivity，并且工作得很好。我决定添加一个AlertDialog，它首先提示用户确保他们希望选中该复选框。十分之九的一切都运行正常但有时特别是当我尝试在加载ActivityPreference时检查一个复选框时，我在尝试显示对话框时遇到以下错误：
android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@45a646d8 is not valid; is your activity running?
at android.view.ViewRoot.setView(ViewRoot.java:468)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.app.Dialog.show(Dialog.java:239)
at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
at com.beargraves.hitechmedia.AppPreferenceActivity.onSharedPreferenceChanged(AppPreferenceActivity.java:385)
at android.app.ApplicationContext$SharedPreferencesImpl$EditorImpl.commit(ApplicationContext.java:2861)
at android.preference.Preference.tryCommit(Preference.java:1199)
at android.preference.Preference.persistBoolean(Preference.java:1404)
at android.preference.CheckBoxPreference.setChecked(CheckBoxPreference.java:154)
at android.preference.CheckBoxPreference.onClick(CheckBoxPreference.java:143)
at android.preference.Preference.performClick(Preference.java:811)
at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:190)
at android.widget.AdapterView.performItemClick(AdapterView.java:284)
at android.widget.ListView.performItemClick(ListView.java:3606)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:1751)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4363)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
at dalvik.system.NativeStart.main(Native Method)
I saw this question但答案似乎并不相关。这是我的代码
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key) {
final String k = key;
if (findPreference(key) instanceof CheckBoxPreference) {
final CheckBoxPreference chkPref = (CheckBoxPreference) findPreference(key);
boolean result = sharedPreferences.getBoolean(key,false);
if(result){
new AlertDialog.Builder(AppPreferenceActivity.this)
.setTitle("Confirm Ation")
.setMessage("Do you wish to: " + chkPref.getTitle())
.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
pDialog.setMessage("Syncing");
pDialog.show();
new SyncTask().execute(k);
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
chkPref.setChecked(false);
}
}).show();
}
}
}
非常感谢任何帮助。