126 lines
5.0 KiB
Java
126 lines
5.0 KiB
Java
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import android.content.Context;
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import android.text.Layout;
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import android.text.StaticLayout;
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import android.text.TextPaint;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.TextView;
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/**
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* TextView + View 动态布局
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* 该布局目前仅支持TextView + View 组合。
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* 来源:https://www.loongwind.com/archives/217.html
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*/
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public class CustomLayout extends ViewGroup {
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//单行显示
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private static final int SINGLE_LINE = 0x01;
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//多行显示
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private static final int MULTI_LINE = 0x02;
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//显示到下一行
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private static final int NEXT_LINE = 0x03;
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//显示样式
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private int type;
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//绘制文字最后一行的顶部坐标
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private int lastLineTop;
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//绘制文字最后一行的右边坐标
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private float lastLineRight;
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public CustomLayout(Context context) {
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super(context);
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}
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public CustomLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public CustomLayout(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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}
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int childCount = getChildCount();
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int w = MeasureSpec.getSize(widthMeasureSpec);
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if (childCount == 2) {
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TextView tv = null;
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if(getChildAt(0) instanceof TextView){
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tv = (TextView) getChildAt(0);
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initTextParams(tv.getText(), tv.getMeasuredWidth(), tv.getPaint());
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}else{
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throw new RuntimeException("CustomLayout first child view not a TextView");
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}
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View sencodView = getChildAt(1);
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//测量子view的宽高
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measureChildren(widthMeasureSpec, heightMeasureSpec);
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//两个子view宽度相加小于该控件宽度的时候
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if (tv.getMeasuredWidth() + sencodView.getMeasuredWidth() <= w) {
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int width = tv.getMeasuredWidth()+sencodView.getMeasuredWidth();
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//计算高度
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int height = Math.max(tv.getMeasuredHeight(), sencodView.getMeasuredHeight());
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//设置该viewgroup的宽高
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setMeasuredDimension(width, height);
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type = SINGLE_LINE;
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return;
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}
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if (getChildAt(0) instanceof TextView) {
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//最后一行文字的宽度加上第二个view的宽度大于viewgroup宽度时第二个控件换行显示
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if (lastLineRight + sencodView.getMeasuredWidth() > w) {
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setMeasuredDimension(tv.getMeasuredWidth(), tv.getMeasuredHeight() + sencodView.getMeasuredHeight());
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type = NEXT_LINE;
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return;
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}
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int height = Math.max(tv.getMeasuredHeight(), lastLineTop + sencodView.getMeasuredHeight());
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setMeasuredDimension(tv.getMeasuredWidth(), height);
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type = MULTI_LINE;
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}
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} else {
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throw new RuntimeException("CustomLayout child count must is 2");
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}
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}
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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if (type == SINGLE_LINE || type == MULTI_LINE) {
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TextView tv = (TextView) getChildAt(0);
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View v1 = getChildAt(1);
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//设置第二个view在Textview文字末尾位置
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tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());
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int left = (int) lastLineRight;
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int top = lastLineTop;
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//最后一行的高度 注:通过staticLayout得到的行高不准确故采用这种方式
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int lastLineHeight = tv.getBottom()-tv.getPaddingBottom() -lastLineTop;
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//当第二view高度小于单行文字高度时竖直居中显示
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if(v1.getMeasuredHeight() < lastLineHeight){
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top = lastLineTop + (lastLineHeight - v1.getMeasuredHeight())/2;
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}
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v1.layout(left, top, left + v1.getMeasuredWidth(), top+v1.getMeasuredHeight());
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} else if (type == NEXT_LINE) {
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View v0 = getChildAt(0);
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View v1 = getChildAt(1);
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//设置第二个view换行显示
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v0.layout(0, 0, v0.getMeasuredWidth(), v0.getMeasuredHeight());
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v1.layout(0, v0.getMeasuredHeight(), v1.getMeasuredWidth(), v0.getMeasuredHeight() + v1.getMeasuredHeight());
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}
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}
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/**
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* 得到Textview绘制文字的基本信息
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* @param text Textview的文字内容
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* @param maxWidth Textview的宽度
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* @param paint 绘制文字的paint
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*/
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private void initTextParams(CharSequence text, int maxWidth, TextPaint paint) {
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StaticLayout staticLayout = new StaticLayout(text, paint, maxWidth, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
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int lineCount = staticLayout.getLineCount();
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lastLineTop = staticLayout.getLineTop(lineCount - 1);
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lastLineRight = staticLayout.getLineRight(lineCount - 1);
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}
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} |