需求：现要实现一个特殊UI的处理，如下图所示：
该布局的上面是一个“按钮”，中间是一个“空白布局（当然也可以是ViewPager等）”，下面是一个页面的导航菜单，底部是一个ListView。
要求：滑动ListView“左边”、“右边”按钮跟着listview滑动，当“左边”、“右边”按钮遇到最上面的那个菜单时“左边”、“右边”按钮悬停，并且listView仍然能够继续滑动，当listview向下滑动时“左边”、“右边”按钮再次跟着listview联动，依次反复。
实现原理：“左边”、“右边”按钮这个导航菜单其实是两个，一个在布局时隐藏掉（固定到顶部菜单下面）另一个则和整个布局是一个整体，当整体的那个“左边”、“右边”按钮碰到顶部菜单时，把整体的那个“左边”、“右边”按钮隐藏到，显示固定的那个“左边”、“右边”按钮。几本原理就是那样了。哈哈。
上代码：
LinkAgeActivity.java
package com.yw.myapiupdate.toscrollviewlinkage;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;import com.yw.myapiupdate.R;public class LinkAgeActivity extends Activity{
private MyListView myLv;
private MyScrollView mySv;
private LinearLayout linear_middle;
private LinearLayout linear_dong;
private LinearLayout linear_jing; int[] location = new int[2];
int[] location2 = new int[2];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.linkage_layout);
initViews();
} private void initViews(){
myLv = (MyListView)findViewById(R.id.linkage_lv);
mySv = (MyScrollView)findViewById(R.id.linkage_scroll);
linear_middle = (LinearLayout)findViewById(R.id.linkage_linear_middle);
linear_dong = (LinearLayout)findViewById(R.id.linkage_linear_menudong);
linear_jing = (LinearLayout)findViewById(R.id.linkage_linear_jing);
LinkAgeBaseAdaper adapter = new LinkAgeBaseAdaper();
myLv.setAdapter(adapter);
setListViewHeightBasedOnChildren(myLv);
mySv.setOnTouchListener(new OnTouchListener(){
private int lastY = 0;
private int touchEventId = 10000;
Handler handler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == touchEventId) {
if (lastY != mySv.getScrollY()) {
//scrollview一直在滚动，会触发
handler.sendMessageDelayed(
handler.obtainMessage(touchEventId, mySv), 5);
lastY = mySv.getScrollY();
linear_dong.getLocationOnScreen(location);
linear_jing.getLocationOnScreen(location2);
//动的到静的位置时，静的显示。动的实际上还是网上滚动，但我们看到的是静止的那个
if (location[1] <= location2[1]) {
linear_jing.setVisibility(View.VISIBLE);
} else {
//静止的隐藏了
linear_jing.setVisibility(View.GONE);
}
}
}
}
}; @Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_MOVE://移动
handler.sendEmptyMessage(touchEventId);
break;
case MotionEvent.ACTION_UP://抬起
handler.sendEmptyMessageDelayed(touchEventId, 5);
break;
}
return false;
} }); } class LinkAgeBaseAdaper extends BaseAdapter{ @Override
public int getCount() {
return 6;
} @Override
public Object getItem(int arg0) {
return null;
} @Override
public long getItemId(int arg0) {
return arg0;
} @Override
public View getView(int arg0, View convertView, ViewGroup arg2) {
LayoutInflater inflater = LayoutInflater.from(LinkAgeActivity.this);
if(convertView == null){
convertView = inflater.inflate(R.layout.linkage_item_layout, null);
}
return convertView;
} }
/**动态改变listView的高度*/
public void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
// totalHeight += 80;
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
// params.height = 80 * (listAdapter.getCount() - 1);
// params.height = 80 * (listAdapter.getCount());
params.height = totalHeight
+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
((MarginLayoutParams) params).setMargins(0, 0, 0, 0);
listView.setLayoutParams(params); }
}
对应布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#99cc99"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="这是一个菜单"/>
</LinearLayout>
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
> <ScrollView
android:id="@+id/linkage_scroll"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:fillViewport="true" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"> <LinearLayout
android:id="@+id/linkage_linear_middle"
android:layout_width="fill_parent"
android:layout_height="120dp"
android:background="#ffcc00" >
<TextView
android:layout_width="fill_parent"
android:layout_height="120dp" />
</LinearLayout>
<LinearLayout
android:id="@+id/linkage_linear_menudong"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="1"
android:text="左边按钮"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="1"
android:text="右边按钮"/>
</LinearLayout>
<ListView
android:id="@+id/linkage_lv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
> </ListView>
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="@+id/linkage_linear_jing"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ff6600"
android:orientation="horizontal"
>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="1"
android:text="左边按钮"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="1"
android:text="右边按钮"/>
</LinearLayout>
</FrameLayout></LinearLayout>
listview的item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="80dp"
android:background="#ff6600"/></LinearLayout>
好了，本文到此结束，欢迎大家提出不同的解决方案
推荐链接：http://blog.csdn.net/xiaanming/article/details/17761431
