[英]Actionbar menu item selection - token null is not for an application
我正在嘗試使用菜單項對象為每個項設置onclick
偵聽器。 我不斷在所選項目上獲得空指針。 我究竟做錯了什么?
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int itemId_ = item.getItemId();
if (itemId_ == R.id.main_activity_actions_cancel) {
new AlertDialog.Builder(getApplicationContext())
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Exit Search Results?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Stop the activity
finish();
}
})
.setNegativeButton("No!", null)
.show();
return true;
}
else if (itemId_ == R.id.main_activity_actions_action_search) {
final AlertDialog.Builder alert = new AlertDialog.Builder(getApplicationContext());
final EditText input = new EditText(getApplicationContext());
input.setHint("type here...");
alert.setView(input);
alert.setPositiveButton("Search", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String value = input.getText().toString().trim();
start_searching_activity(value.trim());
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.cancel();
}
});
alert.show();
return true;
}
return false;
}
日志:
05-10 13:13:11.578 25113-25113/com.secret E/uncaught exception!!! android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
at android.view.ViewRootImpl.setView(ViewRootImpl.java:691)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:288)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:312)
at android.app.AlertDialog$Builder.show(AlertDialog.java:991)
at ads_swiped.secretsCardDealer.onOptionsItemSelected(secretsCardDealer.java:339)
at android.app.Activity.onMenuItemSelected(Activity.java:3024)
at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:373)
at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1199)
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:761)
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:155)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:904)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:894)
at android.widget.ActionMenuView.invokeItem(ActionMenuView.java:611)
at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:180)
at android.view.View.performClick(View.java:5197)
at android.view.View$PerformClick.run(View.java:20909)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5944)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
將getApplicationContext()
替換為getActivity()
final AlertDialog.Builder alert = new AlertDialog.Builder(getApplicationContext());
ApplicationContext
不應用於創建對話框之類的任務。 當您在一個片段中時,您可以通過調用Fragments getActivity()
方法來獲取Activity-Context。
UPDATE
由於這是一個FragmentActivity,你只需要調用this
得到Activity.See 此了解更多詳情。
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