android: netstedscrollview跳转到指定位置
一，代码:
activity xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.Scroll2Activity">
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:id="@+id/houseNestedScrollView"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:fillViewport="true"
android:layout_height="match_parent">
<!--
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="@+id/buttonGo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="300dp"
android:background="#ffff00"
android:text="这是ScrollView的内容部分。" />
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/houseCateViewPager"
android:layout_width="match_parent"
android:background="#ff00ff"
android:layout_height="match_parent"
/>
<!-- 这里可以添加更多的内容 -->
<TextView
android:id="@+id/lastText"
android:layout_width="match_parent"
android:layout_height="300dp"
android:background="#00ffff"
android:text="这是最后一行文本。" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>
<!--
</ScrollView> -->
</androidx.constraintlayout.widget.ConstraintLayout>activity java
package com.example.okdemo1.activity;
import android.animation.ObjectAnimator;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import androidx.core.widget.NestedScrollView;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.okdemo1.MainActivity;
import com.example.okdemo1.R;
import com.example.okdemo1.adapter.HouseFragAdapter;
import com.example.okdemo1.fragment.House1Fragment;
import com.example.okdemo1.fragment.House2Fragment;
import com.example.okdemo1.fragment.House3Fragment;
import java.util.ArrayList;
import java.util.List;
public class Scroll2Activity extends AppCompatActivity {
private List<Fragment> fragmentList = new ArrayList<>(); //fragment的列表
private ViewPager2 vp_house; //viewpager2
private NestedScrollView nestedScrollView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_scroll2);
nestedScrollView = findViewById(R.id.houseNestedScrollView);
//添加fragment到列表
fragmentList.add(new House1Fragment());
fragmentList.add(new House2Fragment());
fragmentList.add(new House3Fragment());
//创建adapter
HouseFragAdapter viewPagerAdapter=new HouseFragAdapter(this,fragmentList);//创建适配器对象
//得到viewpager,并为它设置adapter
vp_house = findViewById(R.id.houseCateViewPager);
vp_house.setAdapter(viewPagerAdapter); // 设置翻页视图的适配器
vp_house.setCurrentItem(0);
vp_house.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
super.onPageScrolled(position, positionOffset, positionOffsetPixels);
// 处理滚动冲突
nestedScrollView.requestDisallowInterceptTouchEvent(true);
}
});
//给按钮增加点击事件,跳转到指定位置
Button button2 = findViewById(R.id.buttonGo);
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 假设targetView是你想要滚动到的视图
View targetView = findViewById(R.id.lastText);
// 获取目标视图在NestedScrollView中的位置
int[] location = new int[2];
targetView.getLocationInWindow(location);
// 由于NestedScrollView的坐标起点可能与屏幕顶部不一致，需要调整
int y = location[1] - nestedScrollView.getPaddingTop();
// 使用scrollTo滚动到指定位置
//nestedScrollView.scrollTo(0, y);
// 使用scrollTo滚动到指定位置,平滑
//nestedScrollView.smoothScrollTo(0, y);
//指定时长
ObjectAnimator animator = ObjectAnimator.ofInt(nestedScrollView, "scrollY", nestedScrollView.getScrollY(), y);
animator.setDuration(1000); // 设置滚动时长为1000毫秒
animator.start();
}
});
}
}fragment xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragment.House1Fragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff8888"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp"/>
</LinearLayout>
</FrameLayout>fragment java
package com.example.okdemo1.fragment;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.okdemo1.R;
import com.example.okdemo1.activity.Bottom3Activity;
import com.example.okdemo1.activity.Scroll2Activity;
import com.example.okdemo1.adapter.HouseFragAdapter;
import com.example.okdemo1.adapter.StringRecycleAdapter;
import java.util.ArrayList;
import java.util.List;
/**
* A simple {@link Fragment} subclass.
* Use the {@link House1Fragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class House1Fragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private RecyclerView recyclerView;
private StringRecycleAdapter adapter;
private List<String> stringList;
public House1Fragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment House1Fragment.
*/
// TODO: Rename and change types and number of parameters
public static House1Fragment newInstance(String param1, String param2) {
House1Fragment fragment = new House1Fragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_house1, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView = view.findViewById(R.id.recyclerView);
stringList = new ArrayList<>();
// 添加测试数据
for (int i = 1; i <= 20; i++) {
stringList.add("第 " + i + " 项");
}
Scroll2Activity activity = (Scroll2Activity) getActivity();
adapter = new StringRecycleAdapter(activity,stringList);
recyclerView.setLayoutManager(new LinearLayoutManager(activity)); // 垂直列表
recyclerView.setAdapter(adapter);
}
}adapter
package com.example.okdemo1.adapter;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import java.util.List;
public class HouseFragAdapter extends FragmentStateAdapter {
private List<Fragment> mFragments;
public HouseFragAdapter(FragmentActivity fa, List<Fragment> fragments) {
super(fa);
mFragments=fragments;
}
@Override
public Fragment createFragment(int position) {
return mFragments.get(position);
}
@Override
public int getItemCount() {
return mFragments.size();
}
}item xml
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textItem"
android:layout_width="match_parent"
android:layout_height="100dp"
android:gravity="center_vertical"
android:background="#dddddd"
android:padding="16dp"
android:textSize="18sp"/>二，测试效果:
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