I updated AppCompat to the newly released revision 22.1.0 and changed my AlertDialog to support.v7.app.AlertDialog. But on a Lollipop device, it throws the following exception on dismissDialog().
java.lang.NullPointerException: attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference at android.support.v7.internal.app.WindowDecorActionBar.getDecorToolbar(WindowDecorActionBar.java:248) at android.support.v7.internal.app.WindowDecorActionBar.init(WindowDecorActionBar.java:201) at android.support.v7.internal.app.WindowDecorActionBar.<init>(WindowDecorActionBar.java:184) at android.support.v7.app.AppCompatDeleg ateImplV7.cre ateSupportActionBar(AppCompatDelegateImplV7.java:176) at android.support.v7.app.AppCompatDelegateImplBase.getSupportActionBar(AppCompatDelegateImplBase.java:85) at android.support.v7.app.AppCompatDelegateImplV7.onStop(AppCompatDeleg ateImplV7.java:221) at android.support.v7.app.AppCompatDialog.onStop(AppCompatDialog.java:108) at android.app.Dialog.dismissDialog(Dialog.java:438) at android.app.Dialog.dismiss(Dialog.java:414) at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:157) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:5834) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183) How do I fix it?
(Lower-version devices seems to work well. This just happens in Lollipop)
+ I don't call dismiss() explicitly in my code. The dialog throws the exception when it is dismissed by back-button or positive/negative button.
++ Here is my code that uses v7.app.AlertDialog. Thank you.
import android.app.Dialog; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v7.app.AlertDialog; import android.text.TextUtils; public class SimpleYesNoFragment extends DialogFragment { public interface OnConfirmListner { public void onConfirm(); } public static SimpleYesNoFragment newInstance(String title, String message) { SimpleYesNoFragment fragment = new SimpleYesNoFragment(); Bundle args = new Bundle(); args.putString("title", title); args.putString("message", message); fragment.setArguments(args); return fragment; } private OnConfirmListner mListener; public void setOnConfirmListener(OnConfirmListner l) { mListener = l; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder b= new AlertDialog.Builder(getActivity()) .setPositiveButton(R.string.yes, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if(mListener != null) { mListener.onConfirm(); } } }) .setNegativeButton(R.string.no, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }); Bundle args = getArguments(); String title = args.getString("title",null); if(!TextUtils.isEmpty(title)) { b.setTitle(title); } String message = args.getString("message",null); if(!TextUtils.isEmpty(message)) { b.setMessage(message); } return b.create(); } }