Android在findViewById时返回空ListView

我创建了一个自定义对话框（带有列表视图）：

final ArrayList pokemons=databaseAccess.getAllPokemonWithTypes（type1，type2）；
//加载自定义的_dialog.xml布局并充气查看
LayoutInflater LayoutInflater=getLayoutInflater（）；
pokemonFoundListView=（ListView）findviewbyd（R.id.pokemon\u list\u视图）；
pokemonAdapter=新的pokemonAdapter（这个，pokemons）；
setAdapter（pokemonAdapter）；
View customizedUserView=（View）LayoutFlater.inflate（R.layout.customized_对话框，空）；
AlertDialog.Builder alertDialogBuilder=新建AlertDialog.Builder（上下文）；
alertDialogBuilder.setView（customizedUserView）；
AlertDialog AlertDialog=alertDialogBuilder.create（）；
setAdapter（pokemonAdapter，新的DialogInterface.OnClickListener（）{
公共void onClick（对话框接口对话框，int项）{
}
});
alertDialog.show（）；

但是，如果我把这个列表视图放在我的content_main.xml（MainActivty视图）中，Android会找到它。我想这里的问题是，我不能从另一个XML视图中引用另一个元素，该视图不是我的content\u main.XML

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如何修复此问题？

尝试在您的custome视图上调用findViewById

    ...

    View customizedUserView = (View) layoutinflater.inflate(R.layout.customized_dialog, null);

    pokemonFoundListView = (ListView) customizedUserView.findViewById(R.id.pokemon_list_view);

    ...

---

希望对您有所帮助

您的对话框以惰性方式添加到视图层次结构中

因此，如果尝试从活动根视图中查找listview（在对话框视图中），则将找不到它。（想想ViewStub）

但是视图在对话框中，因此

View customizedUserView = (View) layoutinflater.inflate(R.layout.customized_dialog, null);
pokemonFoundListView = (ListView)  customizedUserView.findViewById(R.id.pokemon_list_view);

将正确找到视图

     final ArrayList<Pokemon> pokemons = databaseAccess.getAllPokemonWithTypes(type1, type2);

    // load the customized_dialog.xml layout and inflate to view
    LayoutInflater layoutinflater = getLayoutInflater();

    pokemonFoundListView = (ListView)  findViewById(R.id.pokemon_list_view);
    pokemonAdapter = new PokemonAdapter(this, pokemons);
    pokemonFoundListView.setAdapter(pokemonAdapter);

    View customizedUserView = (View) layoutinflater.inflate(R.layout.customized_dialog, null);

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

    alertDialogBuilder.setView(customizedUserView);

    AlertDialog alertDialog = alertDialogBuilder.create();

    alertDialogBuilder.setAdapter(pokemonAdapter, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {

        }
    });

    alertDialog.show();

    ...

    View customizedUserView = (View) layoutinflater.inflate(R.layout.customized_dialog, null);

    pokemonFoundListView = (ListView) customizedUserView.findViewById(R.id.pokemon_list_view);

    ...

View customizedUserView = (View) layoutinflater.inflate(R.layout.customized_dialog, null);
pokemonFoundListView = (ListView)  customizedUserView.findViewById(R.id.pokemon_list_view);