天天记录 - 自定义ViewGroup使用Adapter提供视图

例子下载地址

1. 创建ViewGroup继承自ViewGroup，覆写onMeasure和onLayout

public class CustomViewGroup extends ViewGroup {// ===========================================================// Fields// ===========================================================private BaseAdapter mAdapter;// ===========================================================// Constructors// ===========================================================public CustomViewGroup(Context context) {super(context);}public CustomViewGroup(Context context, AttributeSet attrs) {super(context, attrs);}public CustomViewGroup(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}// ===========================================================// Getter & Setter// ===========================================================public void setAdapter(BaseAdapter pAdapter) {mAdapter = pAdapter;}// ===========================================================// Methods for/from SuperClass/Interfaces// ===========================================================@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int width = MeasureSpec.getSize(widthMeasureSpec);int height = MeasureSpec.getSize(heightMeasureSpec);// 从Adapter获取所有的child Viewint count = mAdapter.getCount();for (int i = 0; i < count; i++) {View view = mAdapter.getView(i, null, null);// 添加到ViewGroupaddView(view);int measuredWidth = view.getMeasuredWidth();int measuredHeight = view.getMeasuredHeight();view.measure(measuredWidth, measuredHeight);}setMeasuredDimension(width, height);}@Overrideprotected void onLayout(boolean changed, int left, int top, int right, int bottom) {if (changed == false) {return;}// 用于纵向显示// 累加每个视图的高度，便于下一个视图获取top顶点值int totalHeight = 0;int childCount = getChildCount();for (int i = 0; i < childCount; i++) {View childView = getChildAt(i);int measuredHeight = childView.getMeasuredHeight();int measuredWidth = childView.getMeasuredWidth();// 设置每个View的显示位置childView.layout(left, totalHeight, measuredWidth, totalHeight + measuredHeight);totalHeight += measuredHeight;}}}

2. 在Activity创建视图，数据，Adapter

public class CustomViewGroup_AdapterActivity extends Activity {@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                // 创建视图        CustomViewGroup customViewGroup = new CustomViewGroup(this);        customViewGroup.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));                // Activity绑定View        setContentView(customViewGroup);                // 创建数据        ArrayList<TextViewInfo> arrayList = new ArrayList<TextViewInfo>();        arrayList.add(new TextViewInfo("自定义", Color.BLUE));        arrayList.add(new TextViewInfo("ViewGroup", Color.YELLOW));        arrayList.add(new TextViewInfo("Adapter", Color.RED));                // 创建Adapter        CustomAdapter customAdapter = new CustomAdapter(this, arrayList);                customViewGroup.setAdapter(customAdapter);                    }/** *存放TextView的文本和背景颜色实体 */public class TextViewInfo {private int mColor;private String mName;public TextViewInfo(String pName, int pColor) {mName = pName;mColor = pColor;}public int getColor() {return mColor;}public void setColor(int mColor) {this.mColor = mColor;}public String getName() {return mName;}public void setName(String mName) {this.mName = mName;}}}

效果图：

扩展：

查看下ListView源码

此例子虽然实现了期望的功能，总感觉onMeasure和onLayout还有更好的做法