Android仿支付宝首页头部伸缩效果

龙旋

共 14284字,需浏览 29分钟

 ·

2021-03-01 13:14

1. 效果图

下面是我们将要实现的效果图:


2.具体实现

我们可以利用design和v7包中的控件来实现,涉及到的控件有

CoordinatorLayout、AppBarLayout、Toolbar、NestedScrollView


第一步:创建一个Scrolling Activity
下面是该activity的界面效果图




第二步:编写最终效果图需要用到的xml
在第一步的基础上构造出我们最终想要的效果图。


(1) include_toolbar_open.xml
该布局是头部展开时toolbar对应的效果图:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="50dp"    android:background="@color/colorPrimary"    >
<RelativeLayout android:layout_margin="@dimen/dimen_10dp" android:layout_toLeftOf="@+id/iv_contact" android:background="@drawable/shape_search" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/dimen_10dp" android:paddingRight="@dimen/dimen_10dp">
<ImageView android:id="@+id/iv_search" android:layout_width="20dp" android:layout_height="20dp" android:layout_centerVertical="true" android:src="@mipmap/ic_search"/> <EditText android:layout_width="match_parent" android:layout_height="match_parent" android:layout_centerVertical="true" android:layout_toRightOf="@id/iv_search" android:hint="搜索商品" android:background="@null" android:paddingLeft="@dimen/dimen_10dp" android:textColorHint="@android:color/white" android:textSize="14sp"/> </RelativeLayout> <ImageView android:id="@+id/iv_plus" android:layout_width="20dp" android:layout_height="20dp" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="@dimen/dimen_10dp" android:src="@mipmap/ic_add"/> <ImageView android:id="@+id/iv_contact" android:layout_width="25dp" android:layout_height="25dp" android:layout_centerVertical="true" android:layout_marginRight="@dimen/dimen_10dp" android:layout_toLeftOf="@id/iv_plus" android:src="@mipmap/ic_contact"/> <View android:id="@+id/bg_toolbar_open" android:layout_width="match_parent" android:layout_height="match_parent"/></RelativeLayout>


(2) include_toolbar_close.xml
该布局是头部收缩时toolbar对应的效果图:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="50dp"    android:background="@color/colorPrimary">
<ImageView android:id="@+id/iv_scan" android:layout_width="25dp" android:layout_height="25dp" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:layout_marginLeft="20dp" android:src="@mipmap/ic_scan"/> <ImageView android:id="@+id/iv_pay" android:layout_width="25dp" android:layout_height="25dp" android:layout_centerVertical="true" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/iv_scan" android:src="@mipmap/ic_payment"/> <ImageView android:id="@+id/iv_charge" android:layout_width="25dp" android:layout_height="25dp" android:layout_centerVertical="true" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/iv_pay" android:src="@mipmap/ic_transfer"/> <ImageView android:layout_width="25dp" android:layout_height="25dp" android:layout_centerVertical="true" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/iv_charge" android:src="@mipmap/ic_card"/> <ImageView android:id="@+id/iv_plus" android:layout_width="25dp" android:layout_height="25dp" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="20dp" android:layout_toRightOf="@+id/iv_scan" android:src="@mipmap/ic_add"/> <View android:id="@+id/bg_toolbar_close" android:layout_width="match_parent" android:layout_height="match_parent"/></RelativeLayout>


(3) include_open.xml
该布局是头部打开时折叠区对应的效果图:

<?xml version="1.0" encoding="utf-8"?><FrameLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@color/colorPrimary">
<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal">
<LinearLayout android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:src="@mipmap/ic_scan"/> <TextView android:layout_gravity="center_horizontal" android:layout_marginTop="5dp" android:text="扫一扫" android:textColor="@color/white" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> <LinearLayout android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:src="@mipmap/ic_payment"/> <TextView android:layout_gravity="center_horizontal" android:layout_marginTop="5dp" android:text="付钱" android:textColor="@color/white" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> <LinearLayout android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:src="@mipmap/ic_transfer"/> <TextView android:layout_gravity="center_horizontal" android:layout_marginTop="5dp" android:text="收钱" android:textColor="@color/white" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> <LinearLayout android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:src="@mipmap/ic_card"/> <TextView android:layout_gravity="center_horizontal" android:layout_marginTop="5dp" android:text="卡包" android:textColor="@color/white" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>
</LinearLayout> <View android:id="@+id/bg_content" android:layout_width="match_parent" android:layout_height="100dp"/></FrameLayout>


(3) content_zfbhome_telescopic.xml


内容区

<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.NestedScrollView 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"    app:layout_behavior="@string/appbar_scrolling_view_behavior"    tools:context=".activity.ZFBHomeTelescopicActivity"    tools:showIn="@layout/activity_zfbhome_telescopic">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="@dimen/text_margin" android:text="@string/large_text" />
</android.support.v4.widget.NestedScrollView>


(3) activity_zfbhome_telescopic.xml
最终的在activity布局里的效果图:


<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout 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:fitsSystemWindows="true"    tools:context=".activity.ZFBHomeTelescopicActivity">
<android.support.design.widget.AppBarLayout android:id="@+id/app_bar" android:layout_width="match_parent" android:layout_height="wrap_content">
<android.support.design.widget.CollapsingToolbarLayout android:id="@+id/toolbar_layout" android:layout_width="match_parent" android:layout_height="match_parent" app:contentScrim="?attr/colorPrimary" app:layout_scrollFlags="scroll|exitUntilCollapsed|snap" >
<include layout="@layout/include_open" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="50dp" app:layout_collapseMode="parallax" app:layout_collapseParallaxMultiplier="0.7"/> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="50dp" app:contentInsetLeft="0dp" app:contentInsetStart="0dp" app:layout_collapseMode="pin" > <include android:id="@+id/include_toolbar_open" layout="@layout/include_toolbar_open"/> <include android:id="@+id/include_toolbar_close" layout="@layout/include_toolbar_close"/>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout>
<include layout="@layout/content_zfbhome_telescopic" />
</android.support.design.widget.CoordinatorLayout>


注:布局中涉及到的一些属性具体的作用就不做阐述了,可以自行查阅。


第三步:主Activity(ZFBHomeTelescopicActivity.java)
我们需要对AppBarLayout设置偏移监听,需要实现一些背景色缩放效果和收缩展开时toolbar对应布局的显示。

public class ZFBHomeTelescopicActivity extends AppCompatActivity implements AppBarLayout.OnOffsetChangedListener {
@BindView(R.id.bg_content) View bgContent; //大布局背景遮罩层 @BindView(R.id.iv_search) ImageView ivSearch; // @BindView(R.id.iv_plus) ImageView ivPlus; @BindView(R.id.iv_contact) ImageView ivContact; @BindView(R.id.iv_scan) ImageView ivScan; @BindView(R.id.iv_pay) ImageView ivPay; @BindView(R.id.iv_charge) ImageView ivCharge; @BindView(R.id.bg_toolbar_close) View bgToolbarClose; //收缩状态下toolbar的遮罩层 @BindView(R.id.toolbar) Toolbar toolbar; @BindView(R.id.toolbar_layout) CollapsingToolbarLayout toolbarLayout; @BindView(R.id.app_bar) AppBarLayout appBar; @BindView(R.id.bg_toolbar_open) //展开状态下toolbar的遮罩层 View bgToolbarOpen; private View toolbarOpen; //展开状态下toolbar显示的内容 private View toolbarClose; //收缩状态下toolbar显示的内容
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_zfbhome_telescopic); ButterKnife.bind(this); toolbarOpen = findViewById(R.id.include_toolbar_open); toolbarClose = findViewById(R.id.include_toolbar_close); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); appBar.addOnOffsetChangedListener(this); }
@Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { //垂直方向偏移 int offset = Math.abs(verticalOffset); //最大偏移距离 int scrollRange = appBarLayout.getTotalScrollRange(); //当滑动没超过一半时,展开状态下toolbar显示内容,根据收缩位置,改变透明值 if (offset <= scrollRange / 2){ toolbarOpen.setVisibility(View.VISIBLE); toolbarClose.setVisibility(View.GONE); //根据偏移百分比,计算透明值 float scale2 = (float) offset / (scrollRange / 2); int alpha2 = (int) (255 * scale2); bgToolbarOpen.setBackgroundColor(Color.argb(alpha2,25,131,209));
}else {//当滑动超过一半,收缩状态下toolbar显示内容,根据收缩位置,改变透明值 toolbarClose.setVisibility(View.VISIBLE); toolbarOpen.setVisibility(View.GONE); float scale3 = (float) (scrollRange - offset) / (scrollRange / 2); int alpha3 = (int) (255 * scale3); bgToolbarClose.setBackgroundColor(Color.argb(alpha3,25,131,209)); } //根据偏移值百分比计算扫一扫布局的透明度值 float scale = (float) offset / scrollRange; int alpha = (int) (255 * scale); bgContent.setBackgroundColor(Color.argb(alpha,25,131,209)); }
@Override protected void onDestroy() { super.onDestroy(); appBar.removeOnOffsetChangedListener(this); }}


源码地址:

https://github.com/gaojuanjuan/MaterialDesign_V7

到这里就结束啦


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