自定义TabHost实现背景图片随选项卡切换滑动效果-阿里云开发者社区

http://download.csdn.net/detail/hfsu0419/4137990

本例子是对TabHost组件的自定义，实现标签居底显示；每个标签包含图片和文字。

布局文件

[html] view plain copy print ?

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#F8FFEE" >
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/text1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/text1"
android:textSize="32dp" />
<TextView
android:id="@+id/text2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/text2"
android:textSize="32dp" />
<TextView
android:id="@+id/text3"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/text3"
android:textSize="32dp" />
</FrameLayout>
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@drawable/bottom_tab_bg" >
</TabWidget>
<ImageView
android:id="@+id/tab_top_select"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_alignParentBottom="true"
android:src="@drawable/topbar_select" />
</RelativeLayout>
</TabHost>

<?xml version="1.0" encoding="utf-8"?> <TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#F8FFEE" >  <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="wrap_content" > <TextView android:id="@+id/text1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="@string/text1" android:textSize="32dp" /> <TextView android:id="@+id/text2" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="@string/text2" android:textSize="32dp" /> <TextView android:id="@+id/text3" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="@string/text3" android:textSize="32dp" /> </FrameLayout> <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:background="@drawable/bottom_tab_bg" > </TabWidget>  <ImageView android:id="@+id/tab_top_select" android:layout_width="45dp" android:layout_height="45dp" android:layout_alignParentBottom="true" android:src="@drawable/topbar_select" /> </RelativeLayout> </TabHost>
MainActivity.java

[java] view plain copy print ?

package com.suxh;
import java.util.ArrayList;
import java.util.List;
import android.app.TabActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TextView;
public class MainActivity extends TabActivity implements OnTabChangeListener {
// 当前选中的Tab标号
private int mCurSelectTabIndex = 0;
// 默认选中第一个tab页移动标志操作
private final int INIT_SELECT = 0;
// 滑动动画执行时间
private final int DELAY_TIME = 500;
private TabHost mTabHost;
// 存放Tab页中ImageView信息
public List<ImageView> imageList = new ArrayList<ImageView>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 取得TabHost对象
mTabHost = getTabHost();
/* 为TabHost添加标签 */
mTabHost.addTab(mTabHost.newTabSpec("tab_1").setIndicator(composeLayout("优惠信息", R.drawable.pic1_s)).setContent(R.id.text1));
mTabHost.addTab(mTabHost.newTabSpec("tab_2").setIndicator(composeLayout("银行公告", R.drawable.pic2_n)).setContent(R.id.text2));
mTabHost.addTab(mTabHost.newTabSpec("tab_3").setIndicator(composeLayout("金融产品", R.drawable.pic3_n)).setContent(R.id.text3));
// 设置TabHost的背景颜色
mTabHost.setBackgroundColor(Color.argb(150, 22, 70, 150));
// 设置当前选中的Tab页
mTabHost.setCurrentTab(0);
// TabHost添加事件
mTabHost.setOnTabChangedListener(this);
// 初始化移动标识这里移到第一个tab页
initCurSelectTab();
}
/**
* 初始化选中Tab覆盖图片的Handler
*/
private Handler initSelectTabHandle = new Handler () {
public void handleMessage (Message msg) {
switch (msg.what) {
case INIT_SELECT:
moveTopSelect(INIT_SELECT);
break;
default:
break;
}
super.handleMessage(msg);
}
};
/**
* 初始化选中Tab覆盖图片
*/
public void initCurSelectTab(){
// 默认选中移动图片位置
Message msg = new Message();
msg.what = INIT_SELECT;
initSelectTabHandle.sendMessageDelayed(msg, DELAY_TIME);
}
/**
* Tab页改变
*/
public void onTabChanged(String tabId) {
// 设置所有选项卡的图片为未选中图片
imageList.get(0).setImageDrawable(getResources().getDrawable(R.drawable.pic1_n));
imageList.get(1).setImageDrawable(getResources().getDrawable(R.drawable.pic2_n));
imageList.get(2).setImageDrawable(getResources().getDrawable(R.drawable.pic3_n));
if (tabId.equalsIgnoreCase("tab_1")) {
imageList.get(0).setImageDrawable(getResources().getDrawable(R.drawable.pic1_s));
// 移动底部背景图片
moveTopSelect(0);
} else if (tabId.equalsIgnoreCase("tab_2")) {
imageList.get(1).setImageDrawable(getResources().getDrawable(R.drawable.pic2_s));
// 移动底部背景图片
moveTopSelect(1);
} else if (tabId.equalsIgnoreCase("tab_3")) {
imageList.get(2).setImageDrawable(getResources().getDrawable(R.drawable.pic3_s));
// 移动底部背景图片
moveTopSelect(2);
}
}
/**
* 移动tab选中标识图片
* @param selectIndex
* @param curIndex
*/
public void moveTopSelect(int selectIndex) {
View topSelect = (View) findViewById(R.id.tab_top_select);
// 起始位置中心点
int startMid = ((View) getTabWidget().getChildAt(mCurSelectTabIndex)).getLeft() + ((View) getTabWidget().getChildAt(mCurSelectTabIndex)).getWidth() / 2;
// 起始位置左边位置坐标
int startLeft = startMid - topSelect.getWidth() / 2;
// 目标位置中心点
int endMid = ((View) getTabWidget().getChildAt(selectIndex)).getLeft() + ((View) getTabWidget().getChildAt(selectIndex)).getWidth() / 2;
// 目标位置左边位置坐标
int endLeft = endMid - topSelect.getWidth() / 2;
TranslateAnimation animation = new TranslateAnimation(startLeft, endLeft - topSelect.getLeft(), 0, 0);
animation.setDuration(200);
animation.setFillAfter(true);
topSelect.bringToFront();
topSelect.startAnimation(animation);
// 改变当前选中按钮索引
mCurSelectTabIndex = selectIndex;
Log.i("fs", "endMid " + endMid + " startLeft " + startLeft + " endLeft" + (endLeft - topSelect.getLeft()));
}
/**
* 这个设置Tab标签本身的布局，需要TextView和ImageView不能重合 s:是文本显示的内容 i:是ImageView的图片位置
*/
public View composeLayout(String s, int i) {
// 定义一个LinearLayout布局
LinearLayout layout = new LinearLayout(this);
// 设置布局垂直显示
layout.setOrientation(LinearLayout.VERTICAL);
ImageView iv = new ImageView(this);
imageList.add(iv);
iv.setImageResource(i);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(0, 5, 0, 0);
layout.addView(iv, lp);
// 定义TextView
TextView tv = new TextView(this);
tv.setGravity(Gravity.CENTER);
tv.setSingleLine(true);
tv.setText(s);
tv.setTextColor(Color.WHITE);
tv.setTextSize(10);
layout.addView(tv, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
return layout;
}
}

自定义TabHost实现背景图片随选项卡切换滑动效果

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