Question

奇怪的是我得到了这个例外。

java.lang.IllegalStateException: You need to use a Theme.AppCompat 
theme (or descendant) with this activity.

我在网上搜索了这个，但没有一个解决方案帮助了我。

这是我的styles.xml文件。

 <!-- Base application theme. -->
 <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="android:textColor">#fff</item>
 </style>

清单文件的一部分是。

 <application
    android:name=".app.AppController"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

添加警告对话框代码后会发生此异常。

 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            //Toast.makeText(getApplicationContext(),"It's me",Toast.LENGTH_SHORT).show();
            PopupMenu homepopup = new PopupMenu(getApplicationContext(), view);
            MenuInflater inflater = homepopup.getMenuInflater();
            inflater.inflate(R.menu.popup_menu, homepopup.getMenu());

            homepopup.show();

            homepopup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                            getApplicationContext());

                    // set title
                    alertDialogBuilder.setTitle("Your Title");

                    // set dialog message
                    alertDialogBuilder
                            .setMessage("Click yes to exit!")
                            .setCancelable(false)
                            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    // if this button is clicked, close
                                    // current activity
                                    InvitationBoard.this.finish();
                                }
                            })
                            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    // if this button is clicked, just close
                                    // the dialog box and do nothing
                                    dialog.cancel();
                                }
                            });
                    AlertDialog alertDialog = alertDialogBuilder.create();

                    // show it
                    alertDialog.show();
                    return true;
                }
            });


        }
    });

Answer 1

构建对话框时，请使用活动上下文而不是应用程序上下文：

            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                    getApplicationContext());

例如，如果您的代码在活动中：

            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

非法状态异常错误 - Android

1 个答案: