本文讨论的是下图的这种数据展示方式
通过本文可以学到的内容
===View绘制的工作流程measure和Layout,即测量和布局;
===动态创建和添加子View,以及设置点击事件的一种思路
1、主要使用的是一个继承自ViewGroup的自定义类NewLineLayout
代码如下:
/** * 可以换行的布局 */ import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import com.orhanobut.logger.Logger; public class NewLineLayout extends ViewGroup { private int mScreenWidth;//屏幕宽度 private int horizontalSpace, verticalSpace;//子View间距 public NewLineLayout(Context context) { this(context, null); } public NewLineLayout(Context context, AttributeSet attrs) { super(context, attrs); mScreenWidth = context.getResources().getDisplayMetrics().widthPixels; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //确定此容器的宽高 int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); //摆放子view View child; //子view摆放的起始位置 int left = getPaddingLeft(); //存储一行view最大的高度,用于子view进行换行时高度的计算 int maxHeightInLine = 0; //存储所有行的高度相加,用于确定此容器的高度 int allHeight = 0; //遍历子view int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { child = getChildAt(i); //测量子View宽高 measureChild(child, widthMeasureSpec, heightMeasureSpec); //两两对比,取得一行中最大的高度 int childHeight = child.getMeasuredHeight() + child.getPaddingTop() + child.getPaddingBottom(); if (childHeight > maxHeightInLine) { maxHeightInLine = childHeight; } left += child.getMeasuredWidth() + horizontalSpace + child.getPaddingLeft() + child.getPaddingRight(); //这一行所有子view相加的宽度大于容器的宽度,需要换行 if (left > widthSize - getPaddingRight()) { //换行的首个子view,起始left为容器的paddingLeft left = getPaddingLeft(); //累积行的总高度 allHeight += maxHeightInLine + verticalSpace; //重置最大高度 maxHeightInLine = 0; } else { allHeight += maxHeightInLine; } } if (widthMode != MeasureSpec.EXACTLY) { widthSize = mScreenWidth;//如果没有指定宽,则默认为屏幕宽 } if (heightMode != MeasureSpec.EXACTLY) {//如果没有指定高度 heightSize = allHeight + getPaddingBottom() + getPaddingTop(); } setMeasuredDimension(widthSize, heightSize); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { if (changed) { //摆放子view View child; //子view摆放的起始位置 int left = getPaddingLeft(); int top = getPaddingTop(); //存储一行view最大的高度,用于子view进行换行时高度的计算 int maxHeightInLine = 0; for (int i = 0, len = getChildCount(); i < len; i++) { child = getChildAt(i); //从第二个子view开始算起 //第一个子view默认从头开始摆放 if (i > 0) { //两两对比,取得一行中最大的高度 if (getChildAt(i - 1).getMeasuredHeight() > maxHeightInLine) { maxHeightInLine = getChildAt(i - 1).getMeasuredHeight(); } //当前子view的起始left为 上一个子view的宽度+水平间距 left += getChildAt(i - 1).getMeasuredWidth() + horizontalSpace; //这一行所有子view相加的宽度大于容器的宽度,需要换行 if (left + child.getMeasuredWidth() > getWidth() - getPaddingRight()) { //换行的首个子view,起始left为容器的paddingLeft left = getPaddingLeft(); //top的位置为上一行中拥有最大高度的某个View的高度+垂直间距 top += maxHeightInLine + verticalSpace; //将上一行View的最大高度置0 maxHeightInLine = 0; } } //摆放子view child.layout(left, top, left + child.getMeasuredWidth(), top + child.getMeasuredHeight()); } } } /** * 设置子view间的水平间距 * * @param horizontalSpace */ public void setHorizontalSpace(int horizontalSpace) { this.horizontalSpace = horizontalSpace; } /** * 设置子view间的垂直间距 * * @param verticalSpace */ public void setVerticalSpace(int verticalSpace) { this.verticalSpace = verticalSpace; } }
注释比较清楚,耐心点绝对能理解
2、动态创建TextView的方法
/** * 创建自定义View * * @param text 文本内容 */ private TextView newCustomTextView(String text) { TextView textView = new TextView(activity); textView.setText(text); //指定文字大小 textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, activity.getResources().getDimension(R.dimen.font_text)); //设置最小宽高 textView.setMinHeight((int) activity.getResources().getDimension(R.dimen.text_height)); textView.setMinWidth((int) activity.getResources().getDimension(R.dimen.text_width)); //设置内边距 int padding = (int) activity.getResources().getDimension(R.dimen.space_tiny); textView.setPadding(padding, 0, padding, 0); textView.setGravity(Gravity.CENTER); return textView; }
3、添加子View,利用tag属性关联View点击事件
private String lineString = "_";//自定义分割字符 private void initView() { final TextView[] textViewArray = new TextView[dataList.length]; View.OnClickListener onClickListener = new View.OnClickListener() { @Override public void onClick(View view) { String tag = (String) view.getTag(); if (!StringUtil.isEmpty(tag)) { int lineIndex = tag.indexOf(lineString); int index = StringUtil.toInt(tag.substring(0, lineIndex), 0); //处理按钮组单选的情况 changeButtonState(textViewArray, index); ToastUtil.showShortToast(activity, dataList[index]); } } }; for (int i = 0; i < dataList.length; i++) { textViewArray[i] = newCustomTextView(dataList[i]); //组合tag处理单击事件 String tag = i + lineString + dataList[i]; textViewArray[i].setTag(tag); textViewArray[i].setOnClickListener(onClickListener); //添加自定义View layContent.addView(textViewArray[i]); } }
4、按钮组的单选实现方法
/** * 单选按钮组 * * @param index 根据序号改变按钮组的状态 */ public void changeButtonState(TextView[] textView, int index) { int size = textView.length; for (int i = 0; i < size; i++) { textView[i].setBackgroundResource(text_normal); textView[i].setTextColor(txt_normal); } textView[index].setBackgroundResource(text_select); textView[index].setTextColor(txt_select); }
===代码地址===