Android学习(33)Spinner_下拉框

Android学习(33)Spinner_下拉框

1.新建一个size_item.xml，配置下拉框的选项

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="size_spinner">
        <item>S</item>
        <item>M</item>
        <item>L</item>
        <item>XL</item>
        <item>XXL</item>
        <item>XXXL</item>
    </string-array>
</resources>

2.在布局文件中布局一个spinner和textview组件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.zs.androidtest2.SpinnerDemo"
    android:orientation="vertical">
    <Spinner
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/size_spinner"
        android:id="@+id/spSize">
    </Spinner>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tvSize"/>
</LinearLayout>

3.在activity中设置监听

public class SpinnerDemo extends AppCompatActivity implements AdapterView.OnItemSelectedListener{

    private Spinner spinner;
    private String size = "S";
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.spinner_demo);

        spinner = (Spinner)findViewById(R.id.spSize);
        spinner.setOnItemSelectedListener(this);
        tv = (TextView)findViewById(R.id.tvSize);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    	//获取当前选中的下拉框的值
       size = (String)spinner.getSelectedItem();
       Text("您选择的是" + size);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        tv.setText("nothing");
    }
}

效果图：