Android实现淘宝选中商品尺寸的按钮组实例

话不多说，先上个效果图：

现在我们就来说说里面的一些原理把！

一、原理：

1.其实这里我们用到的是一个

ViewGroup

控件组，把这些按钮加进去就有这种效果了！不过这里要继承

ViewGroup

（命名为：

GoodsViewGroup

）重写里面的一些方法。

2.主要的方法有：

GoodsViewGroup按钮组的控件大小

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

里面的按钮每个的位置坐标

protected void onLayout(boolean changed, int l, int t, int r, int b) 

这两个方法的具体使用大家可以网上查阅资料，这里就不多说了！

二、代码：

public class GoodsViewGroup<X extends TextView> extends ViewGroup {
 public static final String BTN_MODE = "BTNMODE"; //按钮模式
 public static final String TEV_MODE = "TEVMODE"; //文本模式
 private static final String TAG = "IViewGroup";
 private final int HorInterval = 10; //水平间隔
 private final int VerInterval = 10; //垂直间隔
 private int viewWidth; //控件的宽度
 private int viewHeight; //控件的高度
 private ArrayList<String> mTexts = new ArrayList<>();
 private Context mContext;
 private int textModePadding = 15;
 //正常样式
 private float itemTextSize = 18;
 private int itemBGResNor = R.drawable.goods_item_btn_normal;
 private int itemTextColorNor = Color.parseColor("#000000");
 //选中的样式
 private int itemBGResPre = R.drawable.goods_item_btn_selected;
 private int itemTextColorPre = Color.parseColor("#ffffff");
 public GoodsViewGroup(Context context) {
  this(context, null);
 }
 public GoodsViewGroup(Context context, AttributeSet attrs) {
  super(context, attrs);
  mContext = context;
 }
 
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  viewWidth = measureWidth(widthMeasureSpec);
  viewHeight = measureHeight(heightMeasureSpec);
  Log.e(TAG, "onMeasure:" + viewWidth + ":" + viewHeight);
  // 计算自定义的ViewGroup中所有子控件的大小
  measureChildren(widthMeasureSpec, heightMeasureSpec);
  // 设置自定义的控件MyViewGroup的大小
  setMeasuredDimension(viewWidth, getViewHeight());
 }
 private int measureWidth(int pWidthMeasureSpec) {
  int result = 0;
  int widthMode = MeasureSpec.getMode(pWidthMeasureSpec);
  int widthSize = MeasureSpec.getSize(pWidthMeasureSpec);
  switch (widthMode) {
   
   case MeasureSpec.AT_MOST:
   case MeasureSpec.EXACTLY:
    result = widthSize;
    break;
  }
  return result;
 }
 private int measureHeight(int pHeightMeasureSpec) {
  int result = 0;
  int heightMode = MeasureSpec.getMode(pHeightMeasureSpec);
  int heightSize = MeasureSpec.getSize(pHeightMeasureSpec);
  switch (heightMode) {
   case MeasureSpec.UNSPECIFIED:
    result = getSuggestedMinimumHeight();
    break;
   case MeasureSpec.AT_MOST:
   case MeasureSpec.EXACTLY:
    result = heightSize;
    break;
  }
  return result;
 }
 
 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
  // 遍历所有子视图
  int posLeft = HorInterval;
  int posTop = VerInterval;
  int posRight;
  int posBottom;
  for (int i = 0; i < getChildCount(); i++) {
   View childView = getChildAt(i);
   // 获取在onMeasure中计算的视图尺寸
   int measureHeight = childView.getMeasuredHeight();
   int measuredWidth = childView.getMeasuredWidth();
   if (posLeft + getNextHorLastPos(i) > viewWidth) {
    posLeft = HorInterval;
    posTop += (measureHeight + VerInterval);
   }
   posRight = posLeft + measuredWidth;
   posBottom = posTop + measureHeight;
   childView.layout(posLeft, posTop, posRight, posBottom);
   posLeft += (measuredWidth + HorInterval);
  }
 }
 //获取控件的自适应高度
 private int getViewHeight() {
  int viewwidth = HorInterval;
  int viewheight = VerInterval;
  if (getChildCount() > 0) {
   viewheight = getChildAt(0).getMeasuredHeight() + VerInterval;
  }
  for (int i = 0; i < getChildCount(); i++) {
   View childView = getChildAt(i);
   // 获取在onMeasure中计算的视图尺寸
   int measureHeight = childView.getMeasuredHeight();
   int measuredWidth = childView.getMeasuredWidth();
   if (viewwidth + getNextHorLastPos(i) > viewWidth) {
    viewwidth = HorInterval;
    viewheight += (measureHeight + VerInterval);
   } else {
    viewwidth += (measuredWidth + HorInterval);
   }
  }
  return viewheight;
 }
 private int getNextHorLastPos(int i) {
  return getChildAt(i).getMeasuredWidth() + HorInterval;
 }
 private OnGroupItemClickListener onGroupItemClickListener;
 public void setGroupClickListener(OnGroupItemClickListener listener) {
  onGroupItemClickListener = listener;
  for (int i = 0; i < getChildCount(); i++) {
   final X childView = (X) getChildAt(i);
   final int itemPos = i;
   childView.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View view) {
     onGroupItemClickListener.onGroupItemClick(itemPos);
     chooseItemStyle(itemPos);
    }
   });
  }
 }
 //选中那个的样式
 public void chooseItemStyle(int pos) {
  clearItemsStyle();
  if (pos < getChildCount()) {
   X childView = (X) getChildAt(pos);
   childView.setBackgroundResource(itemBGResPre);
   childView.setTextColor(itemTextColorPre);
   setItemPadding(childView);
  }
 }
 private void setItemPadding(X view) {
  if (view instanceof Button) {
   view.setPadding(textModePadding, 0, textModePadding, 0);
  } else {
   view.setPadding(textModePadding, textModePadding, textModePadding, textModePadding);
  }
 }
 //清除Group所有的样式
 private void clearItemsStyle() {
  for (int i = 0; i < getChildCount(); i++) {
   X childView = (X) getChildAt(i);
   childView.setBackgroundResource(itemBGResNor);
   childView.setTextColor(itemTextColorNor);
   setItemPadding(childView);
  }
 }
 public void addItemViews(ArrayList<String> texts, String mode) {
  mTexts = texts;
  removeAllViews();
  for (String text : texts) {
   addItemView(text, mode);
  }
 }
 private void addItemView(String text, String mode) {
  X childView = null;
  switch (mode) {
   case BTN_MODE:
    childView = (X) new Button(mContext);
    break;
   case TEV_MODE:
    childView = (X) new TextView(mContext);
    break;
  }
  childView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
    LayoutParams.WRAP_CONTENT));
  childView.setTextSize(itemTextSize);
  childView.setBackgroundResource(itemBGResNor);
  setItemPadding(childView);
  childView.setTextColor(itemTextColorNor);
  childView.setText(text);
  this.addView(childView);
 }
 public String getChooseText(int itemID) {
  if (itemID >= 0) {
   return mTexts.get(itemID);
  }
  return null;
 }
 public void setItemTextSize(float itemTextSize) {
  this.itemTextSize = itemTextSize;
 }
 public void setItemBGResNor(int itemBGResNor) {
  this.itemBGResNor = itemBGResNor;
 }
 public void setItemTextColorNor(int itemTextColorNor) {
  this.itemTextColorNor = itemTextColorNor;
 }
 public void setItemBGResPre(int itemBGResPre) {
  this.itemBGResPre = itemBGResPre;
 }
 public void setItemTextColorPre(int itemTextColorPre) {
  this.itemTextColorPre = itemTextColorPre;
 }
 public interface OnGroupItemClickListener {
  void onGroupItemClick(int item);
 }
}

上面提供了可以设置按钮组的item的一些样式，还有这个

GoodsViewGroup

为什么要写成

GoodsViewGroup<X extends TextView>

这样呢？其实这里我是想做一个泛型，可以使用与

Button

跟

TextView

，而这里的

Button

本生就是继承

TextView

所以在代码中还要进行一个判断，可以看上面方法

setItemPadding(X view) 

。那到了这里，有些好友可能就会问，为什么要搞两个呢？

其实这里因为

TextView

的不会自动有设置

padding

的，而

button

是有自动设置

padding

。这个时候你就要看看你是先要那种效果！不过通过我的代码中如果是选择

TextView

的话，这里也设置了一个

padding

给他，不然会很难看！

两种模式的写法：

1.Button :

GoodsViewGroup<Button> mGroup;
mGroup.addItemViews(viewtexts, GoodsViewGroup.BTN_MODE);

2.TextView

GoodsViewGroup<TextView> mGroup;
mGroup.addItemViews(viewtexts, GoodsViewGroup.TEV_MODE);

三、Drawable文件：上面涉及到的按钮选中与正常的两个Drawable

1.goods_item_btn_normal.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
 <item>
  <shape>
   <solid android:color="#F5F5F5" />
   <corners android:radius="15.0dip" />
  </shape>
 </item>
</layer-list>

2.goods_item_btn_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
 <item>
  <shape>
   <solid android:color="#FE4F00" />
   <corners android:radius="15.0dip" />
  </shape>
 </item>
</layer-list>

四、例子：

ButtonGroupActivity

public class ButtonGroupActivity extends Activity implements GoodsViewGroup.OnGroupItemClickListener, View.OnClickListener {
 private GoodsViewGroup<TextView> mGroup;
 private Button mSubmitBtn;
 private ArrayList<String> viewtexts = new ArrayList<>();
 private int chooseID = -1;
 private String chooseText;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  setContentView(R.layout.activity_buttongroup);
  mGroup = (GoodsViewGroup) findViewById(R.id.viewGroup);
  mSubmitBtn = (Button) findViewById(R.id.submitBtn);
  String text;
  for (int i = 0; i < 10; i++) {
   text = "L" + i;
   viewtexts.add(text);
  }
  mGroup.addItemViews(viewtexts, GoodsViewGroup.TEV_MODE);
  mGroup.setGroupClickListener(this);
  mSubmitBtn.setOnClickListener(this);
  super.onCreate(savedInstanceState);
 }
 @Override
 public void onGroupItemClick(int item) {
  chooseID = item;
  chooseText = mGroup.getChooseText(item);
 }
 @Override
 public void onClick(View view) {
  if (chooseID >= 0) {
   showToast("ID:" + chooseID + ";text:" + chooseText);
  } else {
   showToast("请选择");
  }
 }
 private void showToast(String text) {
  Toast.makeText(ButtonGroupActivity.this, text, Toast.LENGTH_SHORT).show();
 }
}

activity_buttongroup.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/linear_ayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 <com.example.jisuanqi.GoodsViewGroup
  android:id="@+id/viewGroup"
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
 </com.example.jisuanqi.GoodsViewGroup>
 <Button
  android:id="@+id/submitBtn"
  android:text="确定"
  android:layout_width="match_parent"
  android:layout_height="wrap_content" />
</LinearLayout>

总结

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