support.v7.app.AlertDialog引发NullPointerException异常上驳回 [英] support.v7.app.AlertDialog throws NullPointerException on dismiss
问题描述
我更新 AppCompat
至新发行版 22.1.0
,改变了我的 AlertDialog
到 support.v7.app.AlertDialog
。但是棒棒糖设备上,它抛出的 dismissDialog以下异常()
。
显示java.lang.NullPointerException:试图在一个空对象引用调用虚方法的java.lang.Class java.lang.Object.getClass()
在android.support.v7.internal.app.WindowDecorActionBar.getDecorToolbar(WindowDecorActionBar.java:248)
在android.support.v7.internal.app.WindowDecorActionBar.init(WindowDecorActionBar.java:201)
在android.support.v7.internal.app.WindowDecorActionBar< INIT>(WindowDecorActionBar.java:184)
在android.support.v7.app.AppCompatDeleg ateImplV7.cre ateSupportActionBar(AppCompatDelegateImplV7.java:176)
在android.support.v7.app.AppCompatDelegateImplBase.getSupportActionBar(AppCompatDelegateImplBase.java:85)
在android.support.v7.app.AppCompatDelegateImplV7.onStop(AppCompatDeleg ateImplV7.java:221)
在android.support.v7.app.AppCompatDialog.onStop(AppCompatDialog.java:108)
在android.app.Dialog.dismissDialog(Dialog.java:438)
在android.app.Dialog.dismiss(Dialog.java:414)
在android.support.v7.app.AlertController $ ButtonHandler.handleMessage(AlertController.java:157)
在android.os.Handler.dispatchMessage(Handler.java:102)
在android.os.Looper.loop(Looper.java:145)
在android.app.ActivityThread.main(ActivityThread.java:5834)
在java.lang.reflect.Method.invoke(本机方法)
在java.lang.reflect.Method.invoke(Method.java:372)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1388)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)
如何解决呢?
(下版本的设备似乎运作良好。这只是发生在棒棒堂)
+
我不叫辞退()
明确地在我的code。该对话框抛出异常时,它被后退按钮或正/负键驳回。
+ 这是我的一个使用v7.app.AlertDialog code。谢谢你。
进口android.app.Dialog;
进口android.content.DialogInterface;
进口android.content.DialogInterface.OnClickListener;
进口android.os.Bundle;
进口android.support.v4.app.DialogFragment;
进口android.support.v7.app.AlertDialog;
进口android.text.TextUtils;
公共类SimpleYesNoFragment扩展DialogFragment {
公共接口OnConfirmListner {
公共无效onConfirm();
}
公共静态SimpleYesNoFragment的newInstance(标题字符串,字符串消息){
SimpleYesNoFragment片段=新SimpleYesNoFragment();
捆绑的args =新包();
args.putString(题,题);
args.putString(消息,消息);
fragment.setArguments(参数);
返回片段;
}
私人OnConfirmListner mListener;
公共无效setOnConfirmListener(OnConfirmListner L){
mListener =升;
}
@覆盖
公共对话onCreateDialog(包savedInstanceState){
AlertDialog.Builder B =新AlertDialog.Builder(getActivity())
.setPositiveButton(R.string.yes,新OnClickListener(){
@覆盖
公共无效的onClick(DialogInterface对话,诠释它){
如果(mListener!= NULL){
mListener.onConfirm();
}
}
})
.setNegativeButton(R.string.no,新OnClickListener(){
@覆盖
公共无效的onClick(DialogInterface对话,诠释它){
}
});
捆绑的args = getArguments();
字符串标题= args.getString(标题,NULL);
如果(!TextUtils.isEmpty(标题)){
b.setTitle(职称);
}
字符串消息= args.getString(信息,NULL);
如果(!TextUtils.isEmpty(消息)){
b.setMessage(消息);
}
返回b.create();
}
}
一个偶然的机会我发现我的项目有值-V21 /的themes.xml
,并将其应用于安卓Theme.Material.Light.Dialog.Alert
到 support.v7.app.AlertDialog
。这引起了奇怪的问题。
使用适当的AppCompat主题,如 Theme.AppCompat.Light.Dialog.Alert
,到 support.v7.app.AlertDialog
解决了这个问题。感谢大家的帮助我。
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();
}
}
By chance I've noticed that my project has values-v21/themes.xml
and it applies android:Theme.Material.Light.Dialog.Alert
to the support.v7.app.AlertDialog
. This caused the weird bug.
Using a proper AppCompat Theme, such as Theme.AppCompat.Light.Dialog.Alert
, to the support.v7.app.AlertDialog
solved the problem. Thanks to everyone for helping me out.
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