android 多行文本显示的textView
package com.zhangyue.iReader.common.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import com.zhangyue.iReader.common.util.Util;
import java.util.List;
/**
* =======================================================================================
* 作 者:caoxinyu
* 创建日期:2018/4/27.
* 类的作用:多行textVIew
* 修订历史:
* =======================================================================================
*/
public class MultiItemTextView extends View{
private Paint mLinePaint;//划线的paint
private Paint mTextPaint;// 文字画笔
private Paint.FontMetricsInt mFontMetricsInt;
private List<String> mStrList;
private int mHeight =0;
private int mLineHeight;
private int mPaddingTB;
private int[] mBeforHeight;//之前所有的item列表的高度
private int[] mCurItemHeight;// 当前item 的高度
private int[] mCurItemTextHeight;// 当前文字的高度
private int[] mCurItemLineNum;//当前item 的行号
private Rect mTempBounds;
private int mMaxText;// 当前一行可以放多少个文字
private int mLineSpace;//多行的时候 两行之间的间距
private int mRightPadding = 0;
public MultiItemTextView(Context context) {
super(context);
init(context);
}
public MultiItemTextView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MultiItemTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context context) {
initPaint(context);
initDistance(context);
}
private void initPaint(Context context) {
mLinePaint = new Paint();
mTextPaint = new Paint();
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(Util.dipToPixel2(getContext(),13));
mFontMetricsInt = mTextPaint.getFontMetricsInt();
mLinePaint.setAntiAlias(true);
mLinePaint.setColor(Color.parseColor("#EEEEEE"));
mTextPaint.setColor(Color.parseColor("#FF222222"));
mLineHeight = Util.dipToPixel(getContext(), 0.67f);
}
private void initDistance(Context context) {
mTempBounds = new Rect();
mLineSpace = Util.dipToPixel(context,2);
mPaddingTB = Util.dipToPixel(getContext(), 16);
mRightPadding = Util.dipToPixel2(context,10);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int startY;
if (mStrList == null) {
return;
}
for (int i = 0; i < mStrList.size(); i++) {
if (i ==0) {
startY = 0;
}else {
startY = mBeforHeight[i-1];
}
canvas.drawLine(0, startY,getWidth(),mLineHeight+ startY,mLinePaint);
int textStartY = startY+ mCurItemHeight[i] / 2 + mCurItemTextHeight[i] / 2 - mFontMetricsInt.descent;
String text = mStrList.get(i);
if (mCurItemLineNum[i] >1) {
for (int j = 0; j < mCurItemLineNum[i]; j++) {
textStartY = startY+ mPaddingTB +(mTempBounds.height())*(j+1)+j* mLineSpace - mFontMetricsInt.descent;
String substring = text.substring(j * mMaxText, mMaxText*(j+1) > text.length() ? text.length(): mMaxText*(j+1));
canvas.drawText(substring,0,textStartY,mTextPaint);
}
}else {
canvas.drawText(text,0,textStartY,mTextPaint);
}
if (i == mStrList.size()-1){
canvas.drawLine(0,mHeight-mLineHeight,getWidth(),mHeight,mLinePaint);
}
}
}
public void setTextSize(int textSize) {
mTextPaint.setTextSize(Util.dipToPixel2(getContext(), textSize));
}
public void setTextColor(int color) {
mTextPaint.setColor(color);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec) -mRightPadding;
if (width ==0) {
return;
}
for (int i = 0; i < mStrList.size(); i++) {
String text = mStrList.get(i);
mTextPaint.getTextBounds(text,0, text.length(), mTempBounds);
float textWidth = mTextPaint.measureText(text);
int line =1;
if (textWidth > width) {
float oneCharLength = textWidth / text.length();
mMaxText = (int) (width / oneCharLength);//一行最大可以放置的文字数
line= text.length() / mMaxText;
if (text.length() % mMaxText !=0) {//如果不能整除 说明还剩余一行
line+=1;
}
int itemHeight = mPaddingTB * 2 + mTempBounds.height()*line +(line-1)* mLineSpace;
mCurItemHeight[i] =itemHeight;
mCurItemTextHeight[i] = mTempBounds.height()*line;
mHeight += itemHeight;
mBeforHeight[i]=mHeight;
}else {
int itemHeight = mPaddingTB * 2 + mTempBounds.height();
mCurItemHeight[i] =itemHeight;
mCurItemTextHeight[i] = mTempBounds.height();
mHeight += itemHeight;
mBeforHeight[i]=mHeight;
}
mCurItemLineNum[i] = line;
}
setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),mHeight);
}
public void setStrList(List<String> strList) {
if (strList == null && strList.size()==0) {
return;
}
mStrList = strList;
mBeforHeight =new int[mStrList.size()];
mCurItemHeight =new int[mStrList.size()];
mCurItemTextHeight =new int[mStrList.size()];
mCurItemLineNum =new int[mStrList.size()];
invalidate();
}
}
直接调用setStrList 设置字符串就可以了。
泰山崩于前而色不变的曹新雨,抱歉