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：
/** * 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); } }
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
/** * 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(); } }
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
以上就是关于Android实现淘宝选中商品不同尺寸的按钮组的全部内容了，如果本文有什么问题欢迎大家指出，大家共同进步！希望本文对大家的学习和工作能有所帮助哦~