實現效果以下android
注:編程
博客:
https://blog.csdn.net/badao_liumang_qizhi
關注公衆號
霸道的程序猿
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將佈局改成LinearLayout,並經過android:orientation="vertical">設置爲垂直佈局,而後添加id屬性。app
而後在res下values下新建arrays.xml,數組資源文件,用來存儲下拉框的選項內容ide
arrays.xml:佈局
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="ctype"> <item>所有</item> <item>公衆號</item> <item>霸道</item> <item>的</item> <item>程序猿</item> <item>博客</item> <item>霸道</item> <item>流氓</item> <item>氣質</item> </string-array> </resources>
只要經過name屬性賦值爲ctype,後續被引用。this
而後再回到activity_spinner.xml中,經過spa
android:entries="@array/ctype"
爲下拉框設置選項數組內容。.net
activity_spinner.xmlcode
<?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" android:orientation="horizontal" tools:context=".SpinnerActivity"> <Spinner android:id="@+id/spinnner" android:entries="@array/ctype" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>
而後來到activity,經過id獲取spinner,而後設置其選項被選中的事件監聽器,獲取選中值的內容並輸出
package com.badao.relativelayouttest; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.Spinner; import android.widget.Toast; public class SpinnerActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_spinner); Spinner spinner = (Spinner) findViewById(R.id.spinnner); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { String result = parent.getItemAtPosition(position).toString(); Toast.makeText(SpinnerActivity.this,result,Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); } }