先看看效果图：
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>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。