Android实现淘宝选中商品尺寸的按钮组实例

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

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

/** * Created by ShaoLin on 2016/8/22. * 这里是类似淘宝中商品尺寸按钮组（这里做了支持button,textview） */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; } /**  * 计算控件的大小  */ @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) {   /**    * mode共有三种情况，取值分别为MeasureSpec.UNSPECIFIED, MeasureSpec.EXACTLY,    * MeasureSpec.AT_MOST。    *    *    * MeasureSpec.EXACTLY是精确尺寸，    * 当我们将控件的layout_width或layout_height指定为具体数值时如andorid    * :layout_width="50dip"，或者为FILL_PARENT是，都是控件大小已经确定的情况，都是精确尺寸。    *    *    * MeasureSpec.AT_MOST是最大尺寸，    * 当控件的layout_width或layout_height指定为WRAP_CONTENT时    * ，控件大小一般随着控件的子空间或内容进行变化，此时控件尺寸只要不超过父控件允许的最大尺寸即可    * 。因此，此时的mode是AT_MOST，size给出了父控件允许的最大尺寸。    *    *    * MeasureSpec.UNSPECIFIED是未指定尺寸，这种情况不多，一般都是父控件是AdapterView，    * 通过measure方法传入的模式。    */   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; } /**  * 覆写onLayout，其目的是为了指定视图的显示位置，方法执行的前后顺序是在onMeasure之后，因为视图肯定是只有知道大小的情况下，  * 才能确定怎么摆放  */ @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); }}

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

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

<?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>

<?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>

/** * Created by ShaoLin on 2016/8/22. */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(); }}

<?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>