[移动开发]android view视图移动 结合tabs

效果

TabActivity

 package com.coral3.ah.ui.activity;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;

import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Scroller;
import android.widget.TextView;

import com.coral3.ah.R;
import com.coral3.ah.components.MoveTabBlock;
import com.coral3.ah.ui.fragment.tab.TabFragment1;
import com.coral3.ah.ui.fragment.tab.TabFragment2;
import com.coral3.ah.ui.fragment.tab.TabFragment3;
import com.coral3.common_module.utils.InitUtil;
import com.coral3.common_module.utils.LogUtil;

public class TabActivity extends AppCompatActivity implements View.OnClickListener{
    private ViewPager viewPager;
    private Fragment[] views;
    private LinearLayout llTabLayout;
    private MoveTabBlock moveTabBlock;
    private int childCount;
    private Scroller mScroller;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab);
        initView();
        initListener();
    }
    public void initView(){
        viewPager = findViewById(R.id.vp_view_tabs);
        views = new Fragment[3];
        views[0] = new TabFragment1();
        views[1] = new TabFragment2();
        views[2] = new TabFragment3();
        viewPager.setAdapter(new MyAdapter(getSupportFragmentManager(), 1));
        llTabLayout = findViewById(R.id.ll_tabs_layout);
        childCount = llTabLayout.getChildCount();
        moveTabBlock = findViewById(R.id.tv_move_block);
        mScroller = new Scroller(this);
        chooseTab(0);
    }

    public void chooseTab(int pos){
        for(int i = 0, len = childCount; i < len; i++){
            LinearLayout childAt = (LinearLayout) llTabLayout.getChildAt(i);
            ((TextView) childAt.getChildAt(1)).setTextColor(InitUtil.getContext().getResources().getColor(R.color.text_no_select));
            childAt.getChildAt(0).setEnabled(true);
        }
        LinearLayout childAt = (LinearLayout) llTabLayout.getChildAt(pos);
        ((TextView) childAt.getChildAt(1)).setTextColor(InitUtil.getContext().getResources().getColor(R.color.black));
        childAt.getChildAt(0).setEnabled(false);
    }
    public void initListener(){
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
//                方式二
//                ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) tvMoveBlock.getLayoutParams();
//                lp.leftMargin = tvMoveBlock.getLeft() + 100;
//                tvMoveBlock.setLayoutParams(lp);
//                方式一
//                tvMoveBlock.offsetLeftAndRight(100);
//                方式三
                // 获取点击视图的x/y轴坐标
                LinearLayout childAt = (LinearLayout) llTabLayout.getChildAt(position);
                int childAtWidth = childAt.getWidth(); // 获取tab块的宽度
                int moveTabBlockWidth = moveTabBlock.getWidth(); // 滑动块的宽度
                int[] location = new int[2];
                childAt.getLocationOnScreen(location);
                int x = location[0]; // 当前点击的块距离屏幕x坐标
                int[] tabXY = new int[2];
                moveTabBlock.getLocationOnScreen(tabXY);
                int tabX = tabXY[0];// 当前移动块距离屏幕x坐标
                LogUtil.d(String.valueOf(x) + "-" + tabXY[0]);
                moveTabBlock.scrollTo(x - tabX + childAtWidth / 2 - moveTabBlockWidth / 2 + 13, 0);
                chooseTab(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
        for(int i = 0; i < childCount; i++){
            llTabLayout.getChildAt(i).setTag(i);
            llTabLayout.getChildAt(i).setOnClickListener(this);
        }
    }

    @Override
    public void onClick(View view) {
        Log.d("yue-tag", view.getTag().toString());
        viewPager.setCurrentItem((int)view.getTag());;
    }

    private class MyAdapter extends FragmentPagerAdapter {

        public MyAdapter(@NonNull FragmentManager fm, int behavior) {
            super(fm, behavior);
        }

        @NonNull
        @Override
        public Fragment getItem(int position) {
            return views[position];
        }

        @Override
        public int getCount() {
            return views.length;
        }
    }
}

MoveTabBlock

package com.coral3.ah.components;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Scroller;

/**
 * createBy 蓝之静云
 */
public class MoveTabBlock extends View {
    // 是否允许滑动
    private Boolean isEvent = false;
    //定义两个变量用于存储按下view时所处的坐标
    int lastX = 0;
    int lastY = 0;

    //滑动
    Scroller scroller;

    public MoveTabBlock(Context context, AttributeSet attrs) {
        super(context, attrs);
        scroller = new Scroller(context);
    }

    @Override public boolean onTouchEvent(MotionEvent event) {
        // 静止视图事件
        if(!isEvent) return false;
        //检测到触摸事件后 第一时间得到相对于父控件的触摸点坐标 并赋值给x,y
        int x = (int) event.getX();
        int y = (int) event.getY();

        switch (event.getAction()) {
            //触摸事件中绕不开的第一步，必然执行，将按下时的触摸点坐标赋值给 lastX 和 last Y
            case MotionEvent.ACTION_DOWN:
                lastX = x;
                lastY = y;
                break;
            //触摸事件的第二步，这时候的x,y已经随着滑动操作产生了变化，用变化后的坐标减去首次触摸时的坐标得到 相对的偏移量
            case MotionEvent.ACTION_MOVE:
                int offsetX = x - lastX;
                int offsetY = y - lastY;

                ((View) getParent()).scrollBy(-offsetX, -offsetY);
                break;

            //触摸事件的第三步，必然执行，手指抬起时候触发，这里会将移动过的view还原到原来的位置，并且有过度效果不是突然移动
            case MotionEvent.ACTION_UP:
                //因为下面要使用父视图的引用来得到偏移量 所以要获得一个父视图引用
                View viewGroup = (View) getParent();

                //调用 startScroll 方法，参数为 起始X坐标，起始Y坐标，目的X坐标，目的Y坐标，过度动画持续时间
                //这里使用了 viewGroup.getScrollX() 和 viewGroup.getScrollY() 作为起始坐标，ScrollY 和 ScrollX 记录了使用 scrollBy 进行偏移的量
                //所以使用他们就等于是使用了现在的坐标作为起始坐标，目的坐标为他们的负数，就是偏移量为0的位置，也是view在没有移动之前的位置
                scroller.startScroll(viewGroup.getScrollX(),
                        viewGroup.getScrollY(),
                        -viewGroup.getScrollX(),
                        -viewGroup.getScrollY(),
                        630);

                //刷新view，这里很重要，如果不执行，下面的 computeScroll 方法就不会执行 computeScroll 方法是由 onDraw 方法调用的，而刷新 View 会调用 onDraw。
                invalidate();
                break;
        }
        return true;
    }

    /**
     * 左右移动
     * @param x x移动距离
     * @param y y移动距离
     */
    public void scrollTo(int x, int y){
        View viewGroup = (View) getParent();
        scroller.startScroll(viewGroup.getScrollX(),
                viewGroup.getScrollY(),
                -x,
                -y,
                800);
        // 刷新视图
        invalidate();
    }

    /**
     * 是否对视图事件打开
     * @param params
     */
    public void openEvent(Boolean params){
        this.isEvent = params;
    }

    public int[] getXY(){
        int[] location = new int[2];
        View viewGroup = (View) getParent();
        location[0] = viewGroup.getScrollX();
        location[1] = viewGroup.getScrollY();
        return location;
    }

    @Override public void computeScroll() {

        //在上面尝试刷新视图之后被调用，并且执行了 computeScrollOffset 方法，
        //此方法根据上面传进来的起始坐标和目的坐标还有动画时间，进行计算每次移动的偏移量
        //如果到达目的坐标 false ，如果不为零 说明没有到达目的坐标
        if (scroller.computeScrollOffset()) {
            //使用 scrollTo 方法进行移动，参数是从 scroller 的 getCurrX 以及 getCurrY 方法得到的，
            // 这两个参数每次在执行 computeScrollOffset 之后都会改变，会越来越接近目的坐标。
            ((View) getParent()).scrollTo(scroller.getCurrX(), scroller.getCurrY());

            // 再次刷新 view 也等于是在循环执行此方法 直到 computeScrollOffset 判断到达目的坐标为止，
            // 循环次数和每次移动的坐标距离相关，每次移动的坐标距离又跟目的坐标的距离和动画时长有关
            //通常距离越长，动画时间越长，循环次数越多

            invalidate();
        }
    }
}

activity_tab.xml

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#F0F0F0"
    tools:context=".ui.activity.TabActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="#fff"
        android:paddingTop="10dp"
        android:paddingBottom="10dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true">
       <LinearLayout
           android:id="@+id/ll_tabs_layout"
           android:layout_width="match_parent"
           android:orientation="horizontal"
           android:layout_height="wrap_content">
           <LinearLayout
               android:layout_width="0dp"
               android:layout_weight="1"
               android:gravity="center"
               android:orientation="horizontal"
               android:layout_height="wrap_content">
               <ImageView
                   android:src="@drawable/tab_selector"
                   android:layout_width="wrap_content"
                   android:layout_marginLeft="@dimen/dp_10"
                   android:layout_height="wrap_content"/>
               <TextView
                   android:text="推荐"
                   android:layout_marginLeft="3dp"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"/>
           </LinearLayout>
           <LinearLayout
               android:layout_width="0dp"
               android:layout_weight="1"
               android:gravity="center"
               android:orientation="horizontal"
               android:layout_height="wrap_content">
               <ImageView
                   android:src="@drawable/tab_selector"
                   android:layout_width="wrap_content"
                   android:layout_marginLeft="@dimen/dp_10"
                   android:layout_height="wrap_content"/>
               <TextView
                   android:text="热榜"
                   android:layout_marginLeft="3dp"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"/>
           </LinearLayout>
           <LinearLayout
               android:layout_width="0dp"
               android:layout_weight="1"
               android:gravity="center"
               android:orientation="horizontal"
               android:layout_height="wrap_content">
               <ImageView
                   android:src="@drawable/tab_selector"
                   android:layout_width="wrap_content"
                   android:layout_marginLeft="@dimen/dp_10"
                   android:layout_height="wrap_content"/>
               <TextView
                   android:text="高赞"
                   android:layout_marginLeft="3dp"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"/>
           </LinearLayout>
       </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="3dp"
            android:gravity="center_vertical">
            <com.coral3.ah.components.MoveTabBlock
                android:id="@+id/tv_move_block"
                android:background="@drawable/bg_radius_5"
                android:layout_marginLeft="50dp"
                android:layout_width="30dp"
                android:layout_height="3dp"/>
<!--            <TextView-->
<!--                android:id="@+id/tv_move_block"-->
<!--                android:background="@drawable/bg_radius_5"-->
<!--                android:layout_marginLeft="53dp"-->
<!--                android:layout_width="30dp"-->
<!--                android:layout_height="3dp"/>-->
        </LinearLayout>
    </LinearLayout>
    <LinearLayout
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <androidx.viewpager.widget.ViewPager
            android:id="@+id/vp_view_tabs"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>
</LinearLayout>

图片素材

tab_img1
tab_img2
tab_img3
tab_blue
tab_red

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="purple_200">#FFBB86FC</color>
    <color name="purple_500">#FF6200EE</color>
    <color name="purple_700">#FF3700B3</color>
    <color name="teal_200">#FF03DAC5</color>
    <color name="teal_700">#FF018786</color>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
    <color name="tabbar_no_act">#bfbfbf</color>
    <color name="tabbar_act">#ffffff</color>
    <color name="devide_line">#F0F0F0</color>
    <color name="text_no_select">#515050</color>
</resources>

bg_radius_5.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <corners android:radius="5dp"/>
    <solid android:color="#03A9F4"/>
</shape>

tab_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="false" android:drawable="@drawable/tab_red"/>
    <item android:state_enabled="true" android:drawable="@drawable/tab_blue"/>
</selector>

TabFragment1

package com.coral3.ah.ui.fragment.tab;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.coral3.ah.R;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link TabFragment1#newInstance} factory method to
 * create an instance of this fragment.
 */
public class TabFragment1 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;

    public TabFragment1() {
        // 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 TabFragment1.
     */
    // TODO: Rename and change types and number of parameters
    public static TabFragment1 newInstance(String param1, String param2) {
        TabFragment1 fragment = new TabFragment1();
        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_tab1, container, false);
    }
}

tab_fragment2

package com.coral3.ah.ui.fragment.tab;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.coral3.ah.R;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link TabFragment2#newInstance} factory method to
 * create an instance of this fragment.
 */
public class TabFragment2 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;

    public TabFragment2() {
        // 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 TabFragment2.
     */
    // TODO: Rename and change types and number of parameters
    public static TabFragment2 newInstance(String param1, String param2) {
        TabFragment2 fragment = new TabFragment2();
        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_tab2, container, false);
    }
}

tab_fragment3

package com.coral3.ah.ui.fragment.tab;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.coral3.ah.R;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link TabFragment3#newInstance} factory method to
 * create an instance of this fragment.
 */
public class TabFragment3 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;

    public TabFragment3() {
        // 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 TabFragment3.
     */
    // TODO: Rename and change types and number of parameters
    public static TabFragment3 newInstance(String param1, String param2) {
        TabFragment3 fragment = new TabFragment3();
        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_tab3, container, false);
    }
}

fragment_tab1.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=".ui.fragment.tab.TabFragment1">

   <ImageView
       android:src="@drawable/tab_img1"
       android:scaleType="fitXY"
       android:layout_width="match_parent"
       android:layout_height="match_parent"/>

</FrameLayout>

fragment_tab2.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=".ui.fragment.tab.TabFragment2">

    <ImageView
        android:src="@drawable/tab_img2"
        android:scaleType="fitXY"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</FrameLayout>

fragment_tab3.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=".ui.fragment.tab.TabFragment3">

    <ImageView
        android:src="@drawable/tab_img3"
        android:scaleType="fitXY"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</FrameLayout>

*路漫长