Android控件之Spinner探究

来源：互联网发布：.com域名申请编辑：程序博客网时间：2024/05/18 03:50

以下模拟下拉列表的用法

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:text="@string/ys"
android:id="@+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="28dip" />
<Spinner android:id="@+id/Spinner01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>

复制代码

SpinnerActivity类

package com.ljq.sp;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;
public class SpinnerActivity extends Activity {
private Spinner sp = null;//下拉列表
private TextView tv = null;
// 所有资源图片的数组
private int[] drawableIds={R.drawable.football,R.drawable.basketball,R.drawable.volleyball};
// 所有字符串的数组
private int[] msgIds={R.string.zq,R.string.lq,R.string.pq};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.TextView01);
sp=(Spinner)this.findViewById(R.id.Spinner01);//初始化Spinner
sp.setAdapter(adapter);
sp.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int positon, long id) {
LinearLayout ll = (LinearLayout) view;
View v=ll.getChildAt(0);//获取第一个控件ImageView
Log.i("ljq", v.getClass().getName());
TextView tvn = (TextView) ll.getChildAt(1);//获取第二个控件TextView
StringBuilder sb = new StringBuilder();
sb.append(getResources().getText(R.string.ys)).append(":").append(tvn.getText());
tv.setText(sb.toString());
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
private BaseAdapter adapter = new BaseAdapter(){
public int getCount() {
return drawableIds.length;
}
public Object getItem(int position) {
return drawableIds[position];
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout ll = new LinearLayout(SpinnerActivity.this);
ll.setOrientation(LinearLayout.HORIZONTAL);
ImageView iv = new ImageView(SpinnerActivity.this);
iv.setImageResource(drawableIds[position]);
ll.addView(iv);
TextView tv=new TextView(SpinnerActivity.this);
tv.setText(msgIds[position]);//设置内容
tv.setTextSize(24);
tv.setTextColor(R.color.black);
ll.addView(tv);
return ll;
}
};
}

复制代码

运行结果

2011-5-14 09:01:04 上传

下载附件(33.64 KB)

分类: android常用控件
标签: android Spinner, android 下拉列表