本文来自http://blog.csdn.net/hellogv/
Android入门第六篇之ListView (一) ,讲的是如何制作一个具有两行文本的 自定义控件 ,作为ListView的Item的使用方法。这篇接下来也是围绕ListView和Item,更加深入地介绍它们的用法。
首先,先来看看本文代码运行的结果,本文的Item比上一篇中的Item多出左边的图标:
main.xml的源代码,跟上一篇的一样,这里就不作解释了,直接贴出item.xml的代码,就是它实现ImageItem的UI:
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xml version="1.0" encoding="utf-8"?>
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<RelativeLayout
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android:layout_width="fill_parent"
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xmlns:android=""
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android:layout_height="wrap_content"
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android:paddingBottom="4dip"
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android:paddingLeft="12dip">
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<ImageView
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android:layout_width="wrap_content"
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android:id="@+id/itemImage" android:layout_height="fill_parent">
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ImageView>
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<TextView
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android:text="TextView01"
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android:layout_height="wrap_content"
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android:layout_width="fill_parent"
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android:id="@+id/itemTitle" android:layout_toRightOf="@+id/itemImage" android:textSize="20dip">
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TextView>
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<TextView
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android:text="TextView02"
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android:layout_height="wrap_content"
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android:layout_width="fill_parent"
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android:id="@+id/itemText" android:layout_toRightOf="@+id/itemImage" android:layout_below="@+id/itemTitle">
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TextView>
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RelativeLayout>
解释一下 item.xml的代码:这里使用了RelativeLayout布局,控件的关键的属性是:
itemTitle的属性 android:layout_toRightOf="@+id/itemImage" ,itemTitle在itemImage的右边;
itemText的属性 android:layout_toRightOf="@+id/itemImage",ItemText在itemImage的右边, android:layout_below="@+id/itemTitle", itemText 在 itemTitle的下面。
最后,贴出JAVA的源代码,其中重点是LayoutInflate的用法。LayoutInflate的使用方法如下:
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package com.testListView;
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import android.app.Activity;
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import android.content.Context;
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import android.os.Bundle;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.BaseAdapter;
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import android.widget.ImageView;
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import android.widget.ListView;
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import android.widget.TextView;
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public class testListView extends Activity {
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ListView listView;
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String[] titles={"标题1","标题2","标题3","标题4"};
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String[] texts={"文本内容A","文本内容B","文本内容C","文本内容D"};
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int[] resIds={R.drawable.icon,R.drawable.icon,R.drawable.icon,R.drawable.icon};
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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this.setTitle("BaseAdapter for ListView");
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listView=(ListView)this.findViewById(R.id.listView1);
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listView.setAdapter(new ListViewAdapter(titles,texts,resIds));
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}
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public class ListViewAdapter extends BaseAdapter {
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View[] itemViews;
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public ListViewAdapter(String[] itemTitles, String[] itemTexts,
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int[] itemImageRes) {
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itemViews = new View[itemTitles.length];
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for (int i = 0; i < itemViews.length; i++) {
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itemViews[i] = makeItemView(itemTitles[i], itemTexts[i],
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itemImageRes[i]);
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}
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}
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public int getCount() {
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return itemViews.length;
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}
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public View getItem(int position) {
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return itemViews[position];
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}
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public long getItemId(int position) {
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return position;
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}
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private View makeItemView(String strTitle, String strText, int resId) {
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LayoutInflater inflater = (LayoutInflater) testListView.this
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.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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View itemView = inflater.inflate(R.layout.item, null);
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TextView title = (TextView) itemView.findViewById(R.id.itemTitle);
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title.setText(strTitle);
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TextView text = (TextView) itemView.findViewById(R.id.itemText);
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text.setText(strText);
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ImageView image = (ImageView) itemView.findViewById(R.id.itemImage);
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image.setImageResource(resId);
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return itemView;
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}
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public View getView(int position, View convertView, ViewGroup parent) {
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if (convertView == null)
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return itemViews[position];
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return convertView;
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}
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}
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}
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