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发表于 2011-08-25 16:38 |只看该作者 |倒序浏览

Android控件之Spinner探究

以下模拟下拉列表的用法

布局文件

01.<?xml version="1.0" encoding="utf-8"?>
02.<LinearLayout android:id="@+id/LinearLayout01"
03. android:layout_width="fill_parent" android:layout_height="fill_parent"
04. android:orientation="vertical"
05. xmlns:android="http://schemas.android.com/apk/res/android">
06. <TextView android:text="@string/ys"
07. android:id="@+id/TextView01"
08. android:layout_width="fill_parent"
09. android:layout_height="wrap_content"
10. android:textSize="28dip" />
11. <Spinner android:id="@+id/Spinner01"
12. android:layout_width="fill_parent"
13. android:layout_height="wrap_content" />
14.</LinearLayout>

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SpinnerActivity类

01.package com.ljq.sp;
02.
03.import android.app.Activity;
04.import android.os.Bundle;
05.import android.util.Log;
06.import android.view.View;
07.import android.view.ViewGroup;
08.import android.widget.AdapterView;
09.import android.widget.BaseAdapter;
10.import android.widget.ImageView;
11.import android.widget.LinearLayout;
12.import android.widget.Spinner;
13.import android.widget.TextView;
14.import android.widget.AdapterView.OnItemSelectedListener;
15.
16.public class SpinnerActivity extends Activity {
17. private Spinner sp = null;//下拉列表
18. private TextView tv = null;
19. // 所有资源图片的数组
20. private int[] drawableIds={R.drawable.football,R.drawable.basketball,R.drawable.volleyball};
21. // 所有字符串的数组
22. private int[] msgIds={R.string.zq,R.string.lq,R.string.pq};
23.
24. @Override
25. public void onCreate(Bundle savedInstanceState) {
26. super.onCreate(savedInstanceState);
27. setContentView(R.layout.main);
28.
29. tv = (TextView) findViewById(R.id.TextView01);
30. sp=(Spinner)this.findViewById(R.id.Spinner01);//初始化Spinner
31. sp.setAdapter(adapter);
32. sp.setOnItemSelectedListener(new OnItemSelectedListener() {
33. public void onItemSelected(AdapterView<?> parent, View view, int positon, long id) {
34. LinearLayout ll = (LinearLayout) view;
35. View v=ll.getChildAt(0);//获取第一个控件ImageView
36. Log.i("ljq", v.getClass().getName());
37. TextView tvn = (TextView) ll.getChildAt(1);//获取第二个控件TextView
38. StringBuilder sb = new StringBuilder();
39. sb.append(getResources().getText(R.string.ys)).append(":").append(tvn.getText());
40. tv.setText(sb.toString());
41. }
42.
43. public void onNothingSelected(AdapterView<?> parent) {
44.
45. }
46. });
47. }
48.
49. private BaseAdapter adapter = new BaseAdapter(){
50. public int getCount() {
51. return drawableIds.length;
52. }
53.
54. public Object getItem(int position) {
55. return drawableIds[position];
56. }
57.
58. public long getItemId(int position) {
59. return position;
60. }
61.
62. public View getView(int position, View convertView, ViewGroup parent) {
63. LinearLayout ll = new LinearLayout(SpinnerActivity.this);
64. ll.setOrientation(LinearLayout.HORIZONTAL);
65.
66. ImageView iv = new ImageView(SpinnerActivity.this);
67. iv.setImageResource(drawableIds[position]);
68. ll.addView(iv);
69.
70. TextView tv=new TextView(SpinnerActivity.this);
71. tv.setText(msgIds[position]);//设置内容
72. tv.setTextSize(24);
73. tv.setTextColor(R.color.black);
74. ll.addView(tv);
75. return ll;
76. }
77. };
78.}

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运行结果

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

android, android

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