android - 在 onItemLongClick 中显示 AlertDialog 会给出有关父项的错误，我必须做什么？

Question

我试图在用户执行 Listview 的 onItemLongClick 时显示一个对话框，以确认用户是否想要这样做，但在 adb.show( ):

The specified child already has a parent. You must call removeView() on the child's parent first

使用以下代码:

listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

            AlertDialog.Builder adb = new AlertDialog.Builder(getBaseContext());
            adb.setView(view);
            adb.setTitle("Title of alert dialog");
            adb.setIcon(android.R.drawable.ic_dialog_alert);
            adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {

                    Toast.makeText(Menu.this, "OK", Toast.LENGTH_LONG).show();
                } });

            adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Toast.makeText(Menu.this, "cancel", Toast.LENGTH_LONG).show();
                    //finish();
                } });
            adb.show();

            return true;
        }
    });

我搜索了答案，但我没有看到有关 listview 或 longclick 的信息，所以我需要帮助 :(

添加 logcat，它给出错误的行是出现adb.show();的地方:

java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:3936)
at android.view.ViewGroup.addView(ViewGroup.java:3786)
at android.view.ViewGroup.addView(ViewGroup.java:3758)
at com.android.internal.app.AlertController.setupView(AlertController.java:492)
at com.android.internal.app.AlertController.installContent(AlertController.java:236)
at android.app.AlertDialog.onCreate(AlertDialog.java:356)
at android.app.Dialog.dispatchOnCreate(Dialog.java:373)
at android.app.Dialog.show(Dialog.java:274)
at android.app.AlertDialog$Builder.show(AlertDialog.java:993)
at pt.isec.jogodememoria.MenuEscolheNivel$2.onItemLongClick(MenuEscolheNivel.java:119)
at android.widget.AbsListView.performLongPress(AbsListView.java:3121)
at android.widget.AbsListView$CheckForLongPress.run(AbsListView.java:3070)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Answer 1

一个很容易犯的错误，缺少 AlertDialog alertDialog = adb.create(); 并且不需要 setView。您仍然可以创建一个单独的方法并为每次长时间的项目点击实例化它。

listView.setOnItemLongClickListener(new AdapterView
            .OnItemLongClickListener() {
    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

        createDialog(view);
        return true;
    }
});

然后为您的对话框创建一个单独的方法:

public void createDialog(View view){

   AlertDialog.Builder adb = new AlertDialog.Builder(this);
    //adb.setView(Main.this);
    adb.setTitle("Title of alert dialog");
    adb.setIcon(android.R.drawable.ic_dialog_alert);
    adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {

            Toast.makeText(getApplicationContext(), "OK", Toast.LENGTH_LONG).show();
        } });

    adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(getApplicationContext(), "cancel", Toast.LENGTH_LONG).show();
            //finish();
        } });

    AlertDialog alertDialog = adb.create();
    alertDialog.show();

}