仿淘宝详情页的商品详情

先上效果图

效果就是上面图片的效果接下来看看如何实现

首先我们来看下布局文件

 <LinearLayoutandroid:id="@+id/header"android:layout_width="match_parent"android:layout_height="72dp"android:paddingTop="24dp"android:background="#00FFFFFF"android:orientation="horizontal"><ImageViewandroid:layout_width="30dp"android:layout_height="30dp"android:layout_gravity="center"android:src="@drawable/back"/><Viewandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"/><ImageViewandroid:id="@+id/icon"android:layout_width="30dp"android:layout_height="30dp"android:src="@drawable/aa"android:layout_gravity="center"/><Viewandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"/><ImageViewandroid:layout_width="30dp"android:layout_height="30dp"android:layout_gravity="center"/></LinearLayout>

这块主要是设置刚进入页面时的透明头部主要组成部分有返回键和头部的方形小图片还有分享按钮以及你想附加的标题功能默认进入是透明的只显示返回按钮

 <FrameLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><RadioGroupandroid:id="@+id/radioGroup"android:background="#00FFFFFF"android:layout_width="match_parent"android:orientation="horizontal"android:layout_height="48dp"><RadioButtonandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:button="@null"android:textColor="#00000000"android:gravity="center"android:text="宝贝"/><RadioButtonandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:button="@null"android:textColor="#00000000"android:gravity="center"android:text="评价"/><RadioButtonandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:button="@null"android:textColor="#00000000"android:gravity="center"android:text="详情"/><RadioButtonandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:gravity="center"android:button="@null"android:textColor="#00000000"android:text="推荐"/></RadioGroup><Viewandroid:id="@+id/layer"android:layout_width="match_parent"android:background="#00FFFFFF"android:layout_height="48dp"/></FrameLayout>

这部分主要是我们的标签选项卡我这边采用的是RadioGroup+radioButton实现的类似于淘宝的商品、评价、详情等标签

这样我们的页面布局头部就完成了下面我们来看下具体组成内容

<com.text.lg.ideascrollview.IdeaScrollViewandroid:id="@+id/ideaScrollView"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><LinearLayoutandroid:id="@+id/one"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><com.text.lg.ideascrollview.IdeaViewPagerandroid:id="@+id/viewPager"android:layout_width="match_parent"android:background="@drawable/aa"android:layout_height="wrap_content"/><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/one"/></LinearLayout><LinearLayoutandroid:id="@+id/two"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/two"/><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/three"/></LinearLayout><ImageViewandroid:id="@+id/three"android:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/four"/><LinearLayoutandroid:id="@+id/four"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/five"/><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/six"/><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/six"/><ImageViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/six"/></LinearLayout></LinearLayout></com.text.lg.ideascrollview.IdeaScrollView>

这部分就是我们的具体页面内容可以看到我们的详情页面数据使用自定义的一个Scrollview来包裹的其中分为4块我们布局里面写的很清楚分别对应着详情页中的四个模块当然我这里面只是用图片来代替内容了具体内容可自己填充

下面来看下我们具体实现代码

StatusBarCompat.translucentStatusBar(this);

我这边是采用的第三方的沉浸式透明状态栏你们可以自行替换

dependencies {compile ('com.github.niorgai:StatusBarCompat:2.1.4', {exclude group: 'com.android.support'})}

这个是我沉浸式状态栏的依赖感兴趣的可以了解一下

 Rect rectangle= new Rect();getWindow().getDecorView().getWindowVisibleDisplayFrame(rectangle);ideaScrollView.setViewPager(viewPager,getMeasureHeight(headerParent)-rectangle.top);icon.setImageAlpha(0);radioGroup.setAlpha(0);radioGroup.check(radioGroup.getChildAt(0).getId());

上面是获取状态栏的高度并且使用自定义scrollview绑定banner图片并获取图片高度

以及初始化我们头部部分控件的透明度和默认选择第一个标签

View one = findViewById(R.id.one);
View two = findViewById(R.id.two);
View four = findViewById(R.id.four);
View three = findViewById(R.id.three);
ArrayList<Integer> araryDistance = new ArrayList<>();araryDistance.add(0);
araryDistance.add(getMeasureHeight(one)-getMeasureHeight(headerParent));
araryDistance.add(getMeasureHeight(one)+getMeasureHeight(two)-getMeasureHeight(headerParent));    araryDistance.add(getMeasureHeight(one)+getMeasureHeight(two)+getMeasureHeight(three)-getMeasureHeight(headerParent));ideaScrollView.setArrayDistance(araryDistance);

这块是我们获取到我们的四个模块的高度并把高度存到集合中传入到我们自定义的scrollview中

 private void scrollToPosition(int position){scrollTo(0,arrayDistance.get(position));}

scrollview通过传过来的高度进行定位滑动意思就是点击我们的标题选项滑动到相应的位置

 public int getMeasureHeight(View view){int width = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);int height = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);view.measure(width, height);return view.getMeasuredHeight();}

这个是获取控件高度的方法

ideaScrollView.setOnScrollChangedColorListener(new IdeaScrollView.OnScrollChangedColorListener() {@Overridepublic void onChanged(float percentage) {int color = getAlphaColor(percentage>0.9f?1.0f:percentage);header.setBackgroundDrawable(new ColorDrawable(color));radioGroup.setBackgroundDrawable(new ColorDrawable(color));icon.setImageAlpha((int) ((percentage>0.9f?1.0f:percentage)*255));radioGroup.setAlpha((percentage>0.9f?1.0f:percentage)*255);setRadioButtonTextColor(percentage);}@Overridepublic void onChangedFirstColor(float percentage) {}@Overridepublic void onChangedSecondColor(float percentage) {}});

这个监听方法是监测我们滑动的距离来改变我们标题的颜色从透明慢慢滑动进行颜色渐变以及设置我们头部控件的颜色和展示我们的标题选项卡

public int getAlphaColor(float f){return Color.argb((int) (f*255),0x09,0xc1,0xf4);}public int getLayerAlphaColor(float f){return Color.argb((int) (f*255),0x09,0xc1,0xf4);}public int getRadioCheckedAlphaColor(float f){return Color.argb((int) (f*255),0x44,0x44,0x44);}public int getRadioAlphaColor(float f){return Color.argb((int) (f*255),0xFF,0xFF,0xFF);}

可以根据这块来改变我们头部以及标题的颜色根据传入的值来进行颜色渐变

 ideaScrollView.setOnSelectedIndicateChangedListener(new IdeaScrollView.OnSelectedIndicateChangedListener() {@Overridepublic void onSelectedChanged(int position) {isNeedScrollTo = false;radioGroup.check(radioGroup.getChildAt(position).getId());isNeedScrollTo = true;}});radioGroup.setOnCheckedChangeListener(radioGroupListener);private RadioGroup.OnCheckedChangeListener radioGroupListener =new RadioGroup.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {for(int i=0;i<radioGroup.getChildCount();i++){RadioButton radioButton = (RadioButton) radioGroup.getChildAt(i);radioButton.setTextColor(radioButton.isChecked()?getRadioCheckedAlphaColor(currentPercentage):getRadioAlphaColor(currentPercentage));if(radioButton.isChecked()&&isNeedScrollTo){ideaScrollView.setPosition(i);}}}};

根据这两个监听方法来改变我们标题的选中tab 滑动到不同的位置选中对应的Tab并改变颜色具体实现方法看自定义Scrollview

根据限定距离（Banner）计算百分比偏移量，实现颜色渐变、透明度渐变（淘宝商品详情页有二次颜色渐变）

 @Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {super.onScrollChanged(l, t, oldl, oldt);if (viewPager != null && t != oldt) {viewPager.setTranslationY(t/2);}if(viewPager!=null&&t<=point.x-headerHeight&&getOnScrollChangedColorListener()!=null){getOnScrollChangedColorListener().onChanged(Math.abs(t)/Float.valueOf(point.x-headerHeight));if(t<=(point.x-headerHeight)/2){getOnScrollChangedColorListener().onChangedFirstColor(t/(point.x-headerHeight)/2);}else{getOnScrollChangedColorListener().onChangedSecondColor((t-(point.x-headerHeight)/2)/(point.x-headerHeight)/2);}}int currentPosition = getCurrentPosition(t,arrayDistance);if(currentPosition!=position&&getOnSelectedIndicateChangedListener()!=null){getOnSelectedIndicateChangedListener().onSelectedChanged(currentPosition);}this.position = currentPosition;}private int getCurrentPosition(int t, ArrayList<Integer> arrayDistance) {int index = 0;for (int i=0;i<arrayDistance.size();i++){if(i==arrayDistance.size()-1){index = i;}else {if(t>=arrayDistance.get(i)&&t<arrayDistance.get(i+1)){index = i;break;}}}return index;}

下面是自定义Scrollview的全部代码

package com.text.lg.ideascrollview;import android.content.Context;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.WindowManager;
import android.widget.ScrollView;import java.util.ArrayList;public class IdeaScrollView extends ScrollView {private final Point point;private IdeaViewPager viewPager;private int position = 0;ArrayList<Integer> arrayDistance = new ArrayList<>();private int headerHeight;public IdeaScrollView(Context context) {this(context,null,0);}public IdeaScrollView(Context context, AttributeSet attrs) {this(context, attrs,0);}public IdeaScrollView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);point = new Point();windowManager.getDefaultDisplay().getSize(point);}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {super.onScrollChanged(l, t, oldl, oldt);if (viewPager != null && t != oldt) {viewPager.setTranslationY(t/2);}if(viewPager!=null&&t<=point.x-headerHeight&&getOnScrollChangedColorListener()!=null){getOnScrollChangedColorListener().onChanged(Math.abs(t)/Float.valueOf(point.x-headerHeight));if(t<=(point.x-headerHeight)/2){getOnScrollChangedColorListener().onChangedFirstColor(t/(point.x-headerHeight)/2);}else{getOnScrollChangedColorListener().onChangedSecondColor((t-(point.x-headerHeight)/2)/(point.x-headerHeight)/2);}}int currentPosition = getCurrentPosition(t,arrayDistance);if(currentPosition!=position&&getOnSelectedIndicateChangedListener()!=null){getOnSelectedIndicateChangedListener().onSelectedChanged(currentPosition);}this.position = currentPosition;}private int getCurrentPosition(int t, ArrayList<Integer> arrayDistance) {int index = 0;for (int i=0;i<arrayDistance.size();i++){if(i==arrayDistance.size()-1){index = i;}else {if(t>=arrayDistance.get(i)&&t<arrayDistance.get(i+1)){index = i;break;}}}return index;}private void scrollToPosition() {scrollToPosition(position);}private void scrollToPosition(int position){scrollTo(0,arrayDistance.get(position));}public void setViewPager(IdeaViewPager viewPager,int headerHeight){this.viewPager = viewPager;this.headerHeight = headerHeight;}public interface OnScrollChangedColorListener{void onChanged(float percentage);void onChangedFirstColor(float percentage);void onChangedSecondColor(float percentage);}public interface OnSelectedIndicateChangedListener{void onSelectedChanged(int position);}private OnSelectedIndicateChangedListener onSelectedIndicateChangedListener;private OnScrollChangedColorListener onScrollChangedColorListener;public OnScrollChangedColorListener getOnScrollChangedColorListener() {return onScrollChangedColorListener;}public void setOnScrollChangedColorListener(OnScrollChangedColorListener onScrollChangedColorListener) {this.onScrollChangedColorListener = onScrollChangedColorListener;}public IdeaViewPager getViewPager() {return viewPager;}public int getPosition() {return position;}public void setPosition(int position) {this.position = position;scrollToPosition();}public ArrayList<Integer> getArrayDistance() {return arrayDistance;}public void setArrayDistance(ArrayList<Integer> arrayDistance) {this.arrayDistance = arrayDistance;}public OnSelectedIndicateChangedListener getOnSelectedIndicateChangedListener() {return onSelectedIndicateChangedListener;}public void setOnSelectedIndicateChangedListener(OnSelectedIndicateChangedListener onSelectedIndicateChangedListener) {this.onSelectedIndicateChangedListener = onSelectedIndicateChangedListener;}
}

以上代码就实现了文中效果图样式

本文借鉴了大佬博客内容 https://blog.csdn.net/AnalyzeSystem/article/details/79442196?from=singlemessage