QQ上的tabhost效果

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class MainActivity extends Activity {

private RelativeLayout layout;

private RelativeLayout layout1;
private RelativeLayout layout2;
private RelativeLayout layout3;

private ImageView tab1;
private ImageView tab2;
private ImageView tab3;

private ImageView first;
private int current = 1; // 默认选中第一个，可以动态的改变此参数值

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initUI();
}

private void initUI(){
layout = (RelativeLayout) findViewById(R.id.root);

layout1 = (RelativeLayout) findViewById(R.id.layout1);
layout2 = (RelativeLayout) findViewById(R.id.layout2);
layout3 = (RelativeLayout) findViewById(R.id.layout3);

tab1 = (ImageView) findViewById(R.id.tab1);
tab1.setOnClickListener(onClickListener);
tab2 = (ImageView) findViewById(R.id.tab2);
tab2.setOnClickListener(onClickListener);
tab3 = (ImageView) findViewById(R.id.tab3);
tab3.setOnClickListener(onClickListener);

RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
rl.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
first = new ImageView(this);
first.setTag("first");
first.setImageResource(R.drawable.topbar_select);

// 默认选中项
switch (current) {
case 1:
layout1.addView(first, rl);
current = R.id.tab1;
break;
case 2:
layout2.addView(first, rl);
current = R.id.tab2;
break;
case 3:
layout3.addView(first, rl);
current = R.id.tab3;
break;
default:
break;
}

}

private boolean isAdd = false; // 是否添加过 top_select
private int select_width; // top_select_width
private int select_height; // top_select_height
private int firstLeft; // 第一次添加后的左边距*****
private int startLeft; // 起始左边距

// 添加一个view，移除一个view
private void replace() {
switch (current) {
case R.id.tab1:
changeTop(layout1);
break;
case R.id.tab2:
changeTop(layout2);
break;
case R.id.tab3:
changeTop(layout3);
break;
default:
break;
}
}

private void changeTop(RelativeLayout relativeLayout){
ImageView old = (ImageView) relativeLayout.findViewWithTag("first");;
select_width = old.getWidth();
select_height = old.getHeight();

RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(select_width, select_height);
rl.leftMargin = old.getLeft() + ((RelativeLayout)old.getParent()).getLeft();
rl.topMargin = old.getTop() + ((RelativeLayout)old.getParent()).getTop();

// 获取起始位置
firstLeft = old.getLeft() + ((RelativeLayout)old.getParent()).getLeft();

ImageView iv = new ImageView(this);
iv.setTag("move");
iv.setImageResource(R.drawable.topbar_select);

layout.addView(iv , rl);
relativeLayout.removeView(old);
}

private OnClickListener onClickListener = new OnClickListener(){
public void onClick(View v) {
if(!isAdd){
replace(); // 初次使用移除old 添加新的top_select为RelativeLayout所使用
isAdd = true;
}

ImageView top_select = (ImageView) layout.findViewWithTag("move");
int tabLeft;
int endLeft = 0;

boolean run = false;

switch (v.getId()) {
case R.id.tab1:
if (current != R.id.tab1) {
// 中心位置
tabLeft = ((RelativeLayout) tab1.getParent()).getLeft() + tab1.getLeft() + tab1.getWidth() / 2;
// 最终位置
endLeft = tabLeft - select_width / 2;
current = R.id.tab1;
run = true;
}
break;
case R.id.tab2:
if (current != R.id.tab2) {
tabLeft = ((RelativeLayout) tab2.getParent()).getLeft() + tab2.getLeft() + tab2.getWidth() / 2;
endLeft = tabLeft - select_width / 2;
current = R.id.tab2;
run = true;
}
break;
case R.id.tab3:
if (current != R.id.tab3) {
tabLeft = ((RelativeLayout) tab3.getParent()).getLeft() + tab3.getLeft() + tab3.getWidth() / 2;
endLeft = tabLeft - select_width/2;
current = R.id.tab3;
run = true;
}
break;
default:
break;
}

if(run){
TranslateAnimation animation = new TranslateAnimation(startLeft, endLeft - firstLeft, 0, 0);
startLeft = endLeft - firstLeft; // 重新设定起始位置
animation.setDuration(400);
animation.setFillAfter(true);
top_select.bringToFront();
top_select.startAnimation(animation);
}

}

};

}


xml文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/default_bg"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="6.0"
>
<RelativeLayout
android:id="@+id/layout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:layout_gravity="center_vertical"
>
<ImageView
android:id="@+id/tab1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab1"
android:layout_centerInParent="true"
/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/layout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:layout_gravity="center_vertical"
>
<ImageView
android:id="@+id/tab2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab2"
android:layout_centerInParent="true"
/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/layout3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:layout_gravity="center_vertical"
>
<ImageView
android:id="@+id/tab3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab3"
android:layout_centerInParent="true"
/>
</RelativeLayout>
</LinearLayout>
<RelativeLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:background="#ffffff"
android:gravity="center"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="123456"
android:textColor="#000fff"
android:textSize="20dip"
android:layout_centerInParent="true"
android:layout_marginLeft="15dip"
/>
</RelativeLayout>
</LinearLayout>
</RelativeLayout>