安卓界面的下拉列表主要使用<Spinner>組件；其中的數組的創建主要分為靜態創建和動態創建，下面主要寫的靜態數組的創建；部分代碼如下所示“

xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
??? xmlns:tools="http://schemas.android.com/tools"
??? android:layout_width="match_parent"
??? android:layout_height="match_parent"
??? android:paddingBottom="@dimen/activity_vertical_margin"
??? android:paddingLeft="@dimen/activity_horizontal_margin"
??? android:paddingRight="@dimen/activity_horizontal_margin"
??? android:paddingTop="@dimen/activity_vertical_margin"
??? tools:context=".MainActivity" >

??? <TextView
??????? android:id="@+id/txt01"
??????? android:layout_width="wrap_content"
??????? android:layout_height="wrap_content"
??????? android:text="@string/hello_world" />
??? <Spinner
??????? android:id="@+id/sp01"
??????? android:layout_width="wrap_content"
??????? android:layout_height="wrap_content"
??????? android:entries="@array/city"
??????? android:layout_toRightOf="@+id/txt01"
??????? />
??? <TextView
??????? android:id="@+id/txt02"
??????? android:layout_width="wrap_content"
??????? android:layout_height="wrap_content"
??????? android:text="你選擇的是："
??????? android:layout_below="@+id/txt01"
??????? android:layout_margin="50dp"
??????? />

</RelativeLayout>

資源文件代碼:

<resources>
??? <string-array name="city">
??????? <item >北京</item>
??????? <item >上海</item>
??????? <item >廣州</item>
??????? <item >深圳</item>
??????? <item >成都</item>
??????? <item >西安</item>
??????? <item >香港</item>
?????? ?
??? </string-array>
?? ?
</resources>

JAVA代碼：

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends Activity {
?? ?private TextView txt2;
?? ?private Spinner sp1;
?? ?private StringBuilder result=new StringBuilder();
??? @Override
??? protected void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? setContentView(R.layout.activity_main);
??????? txt2=(TextView)this.findViewById(R.id.txt02);
??????? sp1=(Spinner)this.findViewById(R.id.sp01);
??????? final String[] cities_list=getResources().getStringArray(R.array.city);
??????? final String wy=txt2.getText().toString();
??????? sp1.setOnItemSelectedListener(new OnItemSelectedListener(){

?? ??? ??? ?@Override
?? ??? ??? ?public void onItemSelected(AdapterView<?> arg0, View arg1,
?? ??? ??? ??? ??? ?int arg2, long arg3) {
?? ??? ??? ??? ?// TODO Auto-generated method stub
?? ??? ??? ??? ?result.delete(0, result.length());
?? ??? ??? ??? ?String ci=cities_list[arg2];
?? ??? ??? ??? ?result.append(wy.toString()+ci.toString());
?? ??? ??? ??? ?txt2.setText(result);
?? ??? ??? ?}

?? ??? ??? ?@Override
?? ??? ??? ?public void onNothingSelected(AdapterView<?> arg0) {
?? ??? ??? ??? ?// TODO Auto-generated method stub
?? ??? ??? ??? ?
?? ??? ??? ?}
??????? });
?????? ?
??? }


??? @Override
??? public boolean onCreateOptionsMenu(Menu menu) {
??????? // Inflate the menu; this adds items to the action bar if it is present.
??????? getMenuInflater().inflate(R.menu.main, menu);
??????? return true;
??? }
?? ?
}

轉載于:https://www.cnblogs.com/wy-internet-cd/p/5423116.html

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