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 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：

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

android:id="@+id/view_list"

android:layout_width="match_parent"

android:layout_height="wrap_content" />

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。