请看下面的截图：
弹出的对话框提供了几个列表供点击选择，但是每一项的后面多了一个居右显示的数字。
首先采用如下方式构建对话框：
String[] items = {"所有分类","IT技术:11","Makingware:4","Makingware模板:5","电子商务:7","麦金公司:16"};
AlertDialog.Builder builder = new AlertDialog.Builder(Main.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("文章分类");
ListAdapter catalogsAdapter = new ArrayAdapter<String>(Main.this, R.layout.catalogs_dialog, items);
builder.setAdapter(catalogsAdapter, new DialogInterface.OnClickListener(){
public void onClick(DialogInterface arg0, int arg1) {
//点击条目后的处理;
}
});
而其中的 R.layout.catalogs_dialog 对应的是 catalogs_dialog.xml ：
<?xml version="1.0" encoding="utf-8"?>
<net.oschina.app.widget.CatalogTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:gravity="center_vertical"
android:paddingLeft="6dip"
android:paddingRight="6dip"
android:textSize="16dip"
android:textColor="#000"
/>
最后我们需要编写一个 CatalogTextView 类，继承 TextView：
package net.oschina.app.widget;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.util.AttributeSet;
import android.widget.TextView;
/**
* 分类对话框条目显示
* @author Winter Lau
* @date 2012-1-10 下午12:56:59
*/
public class CatalogTextView extends TextView {
Paint pcPaint;
public CatalogTextView(Context context) {
this(context, null);
}
public CatalogTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CatalogTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
pcPaint = new Paint();
pcPaint.setColor(Color.DKGRAY);
pcPaint.setTextSize(20);
pcPaint.setTypeface(this.getPaint().getTypeface());
pcPaint.setAntiAlias(true);
pcPaint.setTextAlign(Align.RIGHT);
}
@Override
protected void onDraw(Canvas canvas) {
String txt = this.getText().toString();
int idx = txt.lastIndexOf(':');
String catalog = null;
int pc = 0;
if(idx > 0){
catalog = txt.substring(0, idx);
try{
pc = Integer.parseInt(txt.substring(idx+1));
}catch(Exception e){
catalog = txt;
}
}
else
catalog = txt;
int left = this.getPaddingLeft();
int top = 38;
canvas.drawText(catalog, left, top, this.getPaint());//绘制分类名
//绘制文章数
if(pc > 0) {
String spc = String.format("%3d", pc);
if(pc > 99)
spc = "99+";
int pcLeft = (int)(this.getWidth() - 20);
canvas.drawText(spc, pcLeft, top, pcPaint);
}
canvas.restore();
}
}
完了，实现方法比较土，仅供参考。
