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 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 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。
转载于:https://www.cnblogs.com/caoxinyu/p/10568547.html
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