StickListView--悬停效果

来源：互联网发布：淘宝电脑版详情页制作编辑：程序博客网时间：2024/05/22 02:14

效果图

这里写图片描述

实现思路

监听ListView的滑动，等目的项为列表第一个可见的ItemView时，添加一个一个的布局，产生悬停效果

实现代码

public class CustomViewAcyivity extends BaseActivity {    Toolbar toolbar;    WindowManager mWindowManager;    WindowManager.LayoutParams mWindowLayoutParams;    TextView mTv;    boolean isShowing;//是否正在显示    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_custom_view);        mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);        List<String> list = new ArrayList<>();        for (int i = 0; i < 30; i++) {            list.add("我是第" + (i + 1) + "个选择项");        }        toolbar = $(R.id.toolbar);        ListView listView = $(R.id.view_list);        listView.setAdapter(new ArrayAdapter<>(this, R.layout.item_text, list));        listView.setOnScrollListener(new AbsListView.OnScrollListener() {            @Override            public void onScrollStateChanged(AbsListView view, int scrollState) {            }            @Override            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {                if (firstVisibleItem > 8) {//滑动到目的项时，显示悬停布局                    if (!isShowing)                        show();                } else {                    if (isShowing)                        hide();                }            }        });    }    //显示悬停布局    public void show() {        isShowing = true;        mWindowLayoutParams = new WindowManager.LayoutParams();        mWindowLayoutParams.format = PixelFormat.TRANSLUCENT; //图片之外的其他地方透明        mWindowLayoutParams.gravity = Gravity.TOP;        mWindowLayoutParams.y = toolbar.getHeight() - SystemUtil.getStatusHeight(this);//设置悬停布局显示的Y坐标        mWindowLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;        mWindowLayoutParams.height = UnitUtil.dp2px(this, 50);//设置悬停布局显示的高度        mWindowLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;        //设置悬停布局，为了看起来是悬停效果，布局的内容要设置成与ItemView一致        mTv = new TextView(this);        mTv.setGravity(Gravity.CENTER);        mTv.setBackgroundColor(getResources().getColor(R.color.white));        mTv.setTextSize(UnitUtil.px2sp(this, UnitUtil.dp2px(this, 16)));        mTv.setText("我是第10个选择项");        //添加悬停布局        mWindowManager.addView(mTv, mWindowLayoutParams);    }    //隐藏悬停布局    public void hide() {        if (mTv != null) {            isShowing = false;            mWindowManager.removeView(mTv);            mTv = null;        }    }}

布局代码

<?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">    <include layout="@layout/view_toolbar" />    <ListView        android:id="@+id/view_list"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

3 0