Android实现界面内嵌多种卡片视图（ViewPager、RadioGroup）

Android实现界面内嵌多种卡片视图，具体内容如下

效果如图所示：

1.选择某个界面时，对应的第几个小圆点亮：

通过selector制造圆点和进行更改小圆点被选择和未被选择时的颜色：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_checked="true">
 <shape>
 <solid android:color="@color/app_green_area" />
 <corners android:radius="5dp" />

 </shape>
 </item>
 <item android:state_checked="false">
 <shape>
 <solid android:color="#fff" />
 <corners android:radius="5dp" />
 <stroke android:width="0.2dp"
 android:color="@color/app_line"/>
 </shape>
 </item>
</selector>

2.主界面布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 android:gravity="center"
 android:background="@color/app_gray_bg">
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:textSize="25sp"
 android:textColor="@color/colorPrimary"
 android:text="health页面"/>
 <android.support.v4.view.ViewPager
 android:id="@+id/view_pager"
 android:layout_gravity="center"
 android:overScrollMode="never"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"/>
 </LinearLayout>

 <RadioGroup
 android:layout_alignParentBottom="true"
 android:layout_marginBottom="20dp"
 android:id="@+id/group"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:gravity="center"
 android:orientation="horizontal">

 <RadioButton
 android:layout_width="10dp"
 android:layout_height="10dp"
 android:layout_marginLeft="10dp"
 android:background="@drawable/selector_point"
 android:button="@null" />

 <RadioButton
 android:layout_width="10dp"
 android:layout_height="10dp"
 android:layout_marginLeft="10dp"
 android:background="@drawable/selector_point"
 android:button="@null" />

 <RadioButton
 android:layout_width="10dp"
 android:layout_height="10dp"
 android:layout_marginLeft="10dp"
 android:background="@drawable/selector_point"
 android:button="@null" />

 </RadioGroup>
</RelativeLayout>

3.主界面内嵌的卡片视图布局：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_margin="2dp"
 app:cardCornerRadius="8dp">
 <LinearLayout
 android:id="@+id/chart_bar"
 android:adjustViewBounds="true"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 <TextView
 android:id="@+id/tv_title"
 android:textColor="@color/app_black"
 android:gravity="center"
 android:textSize="30sp"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
 <LinearLayout
 android:adjustViewBounds="true"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 <LinearLayout
 android:id="@+id/layout_data1"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center"
 android:visibility="visible"
 android:orientation="vertical">
 <TextView
  android:text="layout_data1"
  android:textSize="30sp"
  android:textColor="@color/colorPrimary"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" />
 </LinearLayout>
 <LinearLayout
 android:id="@+id/layout_data2"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center"
 android:visibility="visible"
 android:orientation="vertical">
 <TextView
  android:text="layout_data2"
  android:textSize="30sp"
  android:textColor="@color/colorPrimary"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" />
 </LinearLayout>
 <LinearLayout
 android:id="@+id/layout_data3"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center"
 android:visibility="visible"
 android:orientation="vertical">
 <TextView
  android:text="layout_data3"
  android:textSize="30sp"
  android:textColor="@color/colorPrimary"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" />
 </LinearLayout>
 </LinearLayout>
 </LinearLayout>

</android.support.v7.widget.CardView>

4.定义卡片之间切换的样式：

/**
 * 卡片之间切换的样式
 */

public class ZoomOutPageTransformer implements ViewPager.PageTransformer {

 public static final float MAX_SCALE = 0.9f;
 public static final float MIN_SCALE = 0.8f;

 @Override
 public void transformPage(View page, float position) {

 position = position < -1 ? -1 : position;
 position = position > 1 ? 1 : position;

 float tempScale = position < 0 ? 1 + position : 1 - position;

 float slope = (MAX_SCALE - MIN_SCALE) / 1;
 float scaleValue = MIN_SCALE + tempScale * slope;
 page.setScaleX(scaleValue);
 page.setScaleY(scaleValue);
 if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
 page.getParent().requestLayout();
 }
 }
}

5.定义用于加载卡片视图的layout控件，方便自定义宽高比例：

import android.content.Context;
import android.content.res.TypedArray;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/**
 * 用于加载卡片视图
 */

public class RatioLayout extends ViewGroup {

 private float heightWidthRatio = 0.325f;

 public RatioLayout(Context context) {
 this(context, null);
 }

 public RatioLayout(Context context, AttributeSet attrs) {
 super(context, attrs);

 final TypedArray a = context.obtainStyledAttributes(
 attrs, R.styleable.RatioLayout);
 heightWidthRatio = getFloatFromString(a.getString(R.styleable.RatioLayout_height_width_ratio));
 a.recycle();
 }

 public void setHeightWidthRatio(String ratio) {
 heightWidthRatio = getFloatFromString(ratio);
 }

 public static float getFloatFromString(String src) {
 if (TextUtils.isEmpty(src)) {
 return 0;
 }
 float result;
 try {
 result = Float.parseFloat(src);
 return result;
 } catch (Exception e) {
 }

 String[] strs = src.split("/");
 if (strs.length == 2) {
 try {
 float molecular = Float.parseFloat(strs[0]);//分子
 float denominator = Float.parseFloat(strs[1]);//分子
 result = molecular / denominator;
 } catch (Exception e) {
 result = 0;
 }
 } else {
 result = 0;
 }
 return result;
 }

 protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
 layoutChildren(left, top, right, bottom);
 }

 void layoutChildren(int left, int top, int right, int bottom) {
 final int count = getChildCount();
 for (int i = 0; i < count; i++) {
 final View child = getChildAt(i);
 if (child.getVisibility() != GONE) {
 final LayoutParams lp = child.getLayoutParams();
 final int width = child.getMeasuredWidth();
 final int height = child.getMeasuredHeight();
 child.layout(0, 0, width, 0 + height);
 }
 }
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 if (heightWidthRatio > 0) {
 int width = getMeasuredWidth();
 int height = (int) (width * heightWidthRatio);
 setMeasuredDimension(width, height);
 int count = getChildCount();
 if (count >= 1) {
 for (int i = 0; i < count; i++) {
  View child = getChildAt(i);
  child.measure(MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.EXACTLY));
 }
 }
 }
 }
}

6.卡片布局对应的activity：

public class FrHealthChart extends Fragment {

 public static final String DATA = "_data";
 @BindView(R.id.layout_data1)
 LinearLayout layoutData1;
 @BindView(R.id.layout_data2)
 LinearLayout layoutData2;
 @BindView(R.id.layout_data3)
 LinearLayout layoutData3;
 @BindView(R.id.tv_title)
 TextView tvTitle;
 @BindView(R.id.chart_bar)
 LinearLayout chartBar;

 private int position;//用于标识选择的是哪个layout

 public static Fragment getInstance(int position) {
 FrHealthChart frHealthChart = new FrHealthChart();
 Bundle bundle = new Bundle();
 bundle.putInt(DATA, position);
 frHealthChart.setArguments(bundle);
 return frHealthChart;
 }

 @Nullable
 @Override
 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
 View view = inflater.from(getContext()).inflate(R.layout.fragment_health_chart, container, false);
 ButterKnife.bind(this, view);
 Bundle bundle = getArguments();
 if (bundle != null) {
 position = bundle.getInt(DATA);
 initCard();
 }
 //加载卡片视图，控制宽高比例
 RatioLayout ratioLayout = new RatioLayout(getContext());
 ratioLayout.addView(view);
 ratioLayout.setHeightWidthRatio("67/52");
 return ratioLayout;
 }

 private void initCard() {
 switch (position) {
 case 0://显示layoutData1
 layoutData1.setVisibility(View.VISIBLE);
 layoutData2.setVisibility(View.GONE);
 layoutData3.setVisibility(View.GONE);
 initData();
 break;
 case 1://显示layoutData2
 layoutData1.setVisibility(View.GONE);
 layoutData2.setVisibility(View.VISIBLE);
 layoutData3.setVisibility(View.GONE);
 initData();
 break;
 case 2://显示layoutData3
 layoutData1.setVisibility(View.GONE);
 layoutData2.setVisibility(View.GONE);
 layoutData3.setVisibility(View.VISIBLE);
 initData();
 break;
 }
 }

 /**
 * 初始化数据
 */
 private void initData() {
 switch (position) {
 case 0:
 tvTitle.setText("卡片内容" + "layout_data1");
 chartBar.setBackgroundColor(Color.parseColor("#6ddac6"));
 break;
 case 1:
 tvTitle.setText("卡片内容" + "layout_data2");
 chartBar.setBackgroundColor(getResources().getColor(R.color.app_green_area));
 break;
 case 2:
 tvTitle.setText("卡片内容" + "layout_data3");
 chartBar.setBackgroundColor(getResources().getColor(R.color.colorAccent));
 break;
 }
 }

}

7.主界面的activity代码：

public class FrHealth extends Fragment implements ViewPager.OnPageChangeListener {

 @BindView(R.id.view_pager)
 ViewPager viewPager;
 @BindView(R.id.group)
 RadioGroup group;

 @Nullable
 @Override
 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
 View view = LayoutInflater.from(getContext()).inflate(R.layout.fragment_health, container, false);
 ButterKnife.bind(this, view);
 initView();
 return view;
 }

 private void initView() {
 RadioButton childAt = (RadioButton) group.getChildAt(0);
 childAt.setChecked(true);
 viewPager.setPageTransformer(true, new ZoomOutPageTransformer());//设置卡片之间切换的样式
 viewPager.setOffscreenPageLimit(3);//限定预加载的卡片个数
 ViewGroup.LayoutParams layoutParams = viewPager.getLayoutParams();
// layoutParams.height = AppUtil.dp2px(getContext(), 400);
 float scale = getContext().getResources().getDisplayMetrics().density;
 layoutParams.height = (int) (400 * scale + 0.5F);//计算高宽
 layoutParams.width = (int) (layoutParams.height * 0.8);
 if (viewPager.getParent() instanceof ViewGroup) {
 ViewGroup viewParent = ((ViewGroup) viewPager.getParent());
 viewParent.setClipChildren(false);
 viewPager.setClipChildren(false);
 }
 viewPager.addOnPageChangeListener(this);
 MyPagerAdapter myPagerAdapter = new MyPagerAdapter(getChildFragmentManager());
 viewPager.setAdapter(myPagerAdapter);
 }

 @Override
 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

 }

 @Override
 public void onPageSelected(int position) {
 //根据监听viewPager的PageChangeListener获得选择的是哪个卡片，并把其对应位序的小圆点设置为选定状态
 RadioButton childAt = (RadioButton) group.getChildAt(position);
 childAt.setChecked(true);
 }

 @Override
 public void onPageScrollStateChanged(int state) {

 }

 class MyPagerAdapter extends FragmentPagerAdapter {
 HashMap<Integer, Fragment> map = new HashMap<>();

 public MyPagerAdapter(FragmentManager fm) {
 super(fm);
 }

 @Override
 public Fragment getItem(int position) {
 FrHealthChart fragment = (FrHealthChart) map.get(position);
 if (fragment == null) {
 fragment = (FrHealthChart) FrHealthChart.getInstance(position);
 map.put(position, fragment);
 }
 return fragment;
 }

 @Override
 public int getCount() {
 return 3;//卡片个数
 }
 }
}

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