在Android中以编程方式创建微调器 [英] Create a spinner programmatically in Android

问题描述

我想创建一个不使用XML的微调框.我是android的新手，我的知识很有限.到目前为止，我已经有了这段代码(请参见上文)，并且希望我的微调器位于TabActivity的选项卡之一中. 没有明显的错误，但是当我打开活动时，该选项卡为空.我会感谢您的帮助.

I want to create a spinner without using XML. I am new in android and my knowledge is limited. By now I have this code (see above) and I want my spinner in one of the tabs of my TabActivity. There is no obvious error but when I open my activity the tab is empty. I would appreciate some help.

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    ArrayList<String> spinnerArray = new ArrayList<String>();
    spinnerArray.add("one");
    spinnerArray.add("two");
    spinnerArray.add("three");
    spinnerArray.add("four");
    spinnerArray.add("five");

    Spinner spinner = new Spinner(this);
    ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray);
    spinner.setAdapter(spinnerArrayAdapter);

}

推荐答案

您需要将Spinner添加到布局中.

You need to add the Spinner to a layout.

首先为Spinner创建一个container，然后创建Spinner并将其添加到您的container中.接下来将Activity的内容设置为container.

First create a container for the Spinner and then create the Spinner and add it to your container. Next set content of you Activity to your container.

可以在您的onCreate方法中这样完成:

This could be done like this, in your onCreate method:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);

    LinearLayout layout = new LinearLayout(this);

    ArrayList<String> spinnerArray = new ArrayList<String>();
    spinnerArray.add("one");
    spinnerArray.add("two");
    spinnerArray.add("three");
    spinnerArray.add("four");
    spinnerArray.add("five");

    Spinner spinner = new Spinner(this);
    ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray);
    spinner.setAdapter(spinnerArrayAdapter);

    layout.addView(spinner);

    setContentView(layout);
}

只需澄清一下:如果Spinner没有添加到布局内的Activity的内容中，则它是不可见的，因此这就是为什么您不会得到任何错误或任何东西的原因，因为其中没有本身的代码中没有任何错误；-)

Just to clarify: if the Spinner isn't added to the content of the Activity inside a layout, it isn't visible, so that's why you don't get any errors or anything, because there isn't any errors in your code, per se ;-)

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