andorid-动态选项菜单的实现

通过重载方法public boolean onPrepareOptionsMenu(Menu menu) {}来实现。

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		return super.onCreateOptionsMenu(menu);
	}
	
	@Override
	public boolean onPrepareOptionsMenu(Menu menu) {
		menu.clear();
		menu.add(...);//这里添加需要的菜单
		return super.onPrepareOptionsMenu(menu);
	}

好多人问怎么实现tab上有数字，其实很简单实现方法有很多，这里有布局实现吧，只是demo，希望大家明白原理res/drawable/shapecount.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  <corners android:radius="20dp"  />    
  <solid android:color="#ff2233" />
</shape>

res/layout/tabicon.xml

<RelativeLayout
    android:orientation="vertical"
    android:background="@null"
    android:id="@+id/rlayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >
    <ImageView 
            android:id="@+id/icon"
            android:src="/blog_article/@android_drawable/ic_menu_mylocation/index.html" <!-- Just for test -->
            android:layout_margin="0dp"
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content"/>

    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:text="50" android:textSize="12dp" android:text  
        android:background="@drawable/shapecount"
        android:textColor="#FFFFFF"
        android:paddingLeft="3dp" android:paddingRight="3dp"
            android:layout_margin="0dp"
        android:layout_alignBottom="@+id/rlayout"
        android:id="@+id/txtCount" />

</RelativeLayout>

View view = inflater.inflate(R.layout.tabicon, null);
final TextView txtCount = (TextView) view.findViewById(R.id.txtCount);

spec = tabHost.newTabSpec("artists").setIndicator(view).setContent(intent);

package ceshi;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;


public class stringinttimestamp {


public static void main(String[] args) {
String time = "2010年12月08日11时17分00秒";
System.out.println(time);

// 字符串=======>时间戳
String re_str = getTime(time);
System.out.println(re_str);

// 时间戳======>字符串
String data = getStrTime("1316626497");
System.out.println(data);
}


// 将字符串转为时间戳
public static String getTime(String user_time) {
String re_time = null;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日HH时mm分ss秒");
Date d;
try {
d = sdf.parse(user_time);
long l = d.getTime();
String str = String.valueOf(l);
re_time = str.substring(0, 10);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return re_time;
}

// 将时间戳转为字符串
public static String getStrTime(String cc_time) {
String re_StrTime = null;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日HH时mm分ss秒");
// 例如：cc_time=1291778220
long lcc_time = Long.valueOf(cc_time);
re_StrTime = sdf.format(new Date(lcc_time * 1000L));
return re_StrTime;
}
}