ListView悬浮框效果及 动态tab效果

效果图一：

效果图二：

原理：（1）ListView外面套一层相对布局，隐藏一个标题

（2）监听ScrollView的滚动

Demo地址：http://download.youkuaiyun.com/download/baopengjian/10000169

关键代码：

效果一：

private ListView lv;

private View ll_hide,mHeadView,ll_title;

private int[] mHideLocation = new int[2];

private int[] mTitleLocation = new int[2];

@Override

public void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_demo1);

lv = (ListView) findViewById(R.id.lv);

ll_hide = findViewById(R.id.ll_hide);

mHeadView = View.inflate(this,R.layout.lv_head,null);

ll_title = mHeadView.findViewById(R.id.ll_title);

lv.addHeaderView(mHeadView);

String[] array = new String[100];

for(int i = 0;i<array.length;i++){

Random random = new Random();

array[i] = String.valueOf(random.nextInt(i+1));

}

lv.setAdapter(new ArrayAdapter<String>(Demo1Activity.this,android.R.layout.simple_list_item_1,array));

lv.setOnScrollListener(new AbsListView.OnScrollListener() {

@Override

public void onScrollStateChanged(AbsListView absListView, int i) {

}

@Override

public void onScroll(AbsListView absListView, int i, int i1, int i2) {

ll_hide.getLocationOnScreen(mHideLocation);

ll_title.getLocationOnScreen(mTitleLocation);

//比较y方向坐标

if(mTitleLocation[1]<mHideLocation[1]){

ll_hide.setVisibility(View.VISIBLE);

}else {

ll_hide.setVisibility(View.GONE);

}

}

});

}

效果二：

private ListView lv;

private View mHeadView,ll_title;

@Override

public void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_demo2);

lv = (ListView) findViewById(R.id.lv);

mHeadView = View.inflate(this,R.layout.lv_head2,null);

ll_title = findViewById(R.id.ll_title);

lv.addHeaderView(mHeadView);

final List<NewStockCalendar> list = DataSupport.getDatas();

Adapter2 adapter = new Adapter2(this,list);

lv.setAdapter(adapter);

lv.setOnScrollListener(new AbsListView.OnScrollListener() {

@Override

public void onScrollStateChanged(AbsListView absListView, int i) {

}

@Override

public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

if(firstVisibleItem>0){

ll_title.setVisibility(View.VISIBLE);

((TextView)ll_title.findViewById(R.id.tv_date)).setText(list.get(firstVisibleItem).getSgsx());

}else{

ll_title.setVisibility(View.GONE);

}

}

});

}