Android开发--Spinner控件的使用

分手后的思念是犯贱 2022-03-19 13:46 498阅读 0赞

我们经常会在Windows开发的过程中看到一个下拉菜单控件，在Android中也有相应的控件，它的名字叫Spinner，本文介绍Spinner的用法。

首先，下面的这张截图是实现的实例：

![1359042233_2830.png][]

在第一行，你会看到一行说明“This is just Test！”，这个类似于标题，它的定义方法是spinner.setPrompt("This is just Test!");

下面的数据是引用资源，使用的是string数组，让我们来看下数组的定义：

<string-array name="planets_array">        <item>Mercury</item>        <item>Venus</item>        <item>Earth</item>        <item>Mars</item>        <item>Jupiter</item>        <item>Saturn</item>        <item>Uranus</item>        <item>Neptune</item>    </string-array>

当用户点击选择Spinner的下拉选项时，会弹出相应的Toast说明，这就需要实现相应的监听功能

下面给出本程序的源代码：

public class Spinner_Activiy extends Activity { private Spinner spinner=null; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_spinner__activiy);  Spinner spinner = (Spinner) findViewById(R.id.planets_spinner);  // Create an ArrayAdapter using the string array and a default spinner layout  ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,          R.array.planets_array, android.R.layout.simple_spinner_item);  // Specify the layout to use when the list of choices appears  adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  // Apply the adapter to the spinner  spinner.setAdapter(adapter);  spinner.setPrompt("This is just Test!");  spinner.setOnItemSelectedListener(new SpinnerActivity()); } public class SpinnerActivity implements OnItemSelectedListener {              public void onItemSelected(AdapterView<?> parent, View view,              int pos, long id) {         // An item was selected. You can retrieve the selected item using         // parent.getItemAtPosition(pos)      Toast.makeText(Spinner_Activiy.this, "Your selection is "+parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();     }     public void onNothingSelected(AdapterView<?> parent) {         // Another interface callback     } } @Override public boolean onCreateOptionsMenu(Menu menu) {  // Inflate the menu; this adds items to the action bar if it is present.  getMenuInflater().inflate(R.menu.activity_spinner__activiy, menu);  return true; }}

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[1359042233_2830.png]: https://img-my.csdn.net/uploads/201301/24/1359042233_2830.png
[https_blog.csdn.net_jiangjunshow]: https://blog.csdn.net/jiangjunshow/article/details/77338485