自定义垂直文字view

package app.inter.com.heartprogress;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

/**
 * Created by li.fuzhen on 2017/2/4.
 */

public class VerticalTextView extends View {
    private Paint mPaint;
    private String mText;
    private static final int ORIENTATION_HORIZONTAL = 0;
    private static final int ORIENTATION_VERTICAL = 1;
    private int orientation = ORIENTATION_HORIZONTAL;
    private Rect rect = new Rect();
    private int mHeight;
    private int mCurrentHeight;
    private String singleText;
    private int mWithOnce = 1;
    private int index;

    public VerticalTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
        if (attrs != null) {
            TypedArray typeArray = context.obtainStyledAttributes(attrs, R.styleable.VerticalTextView);
            mText = typeArray.getString(R.styleable.VerticalTextView_tv_text);
            orientation = typeArray.getInt(R.styleable.VerticalTextView_orientation, ORIENTATION_HORIZONTAL);
            typeArray.recycle();
        }
        mPaint.getTextBounds(mText, 0, mText.length(), rect);
    }

    private void init() {
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStrokeWidth(1f);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setColor(Color.BLACK);
        mPaint.setTextSize(40f);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mHeight = getHeight();
        Log.e("zxc", "-----" + rect.width() / mHeight);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Log.e("zxc", "2");
        if (orientation == ORIENTATION_VERTICAL) {
            for (int i = 0; i < mText.length(); i++) {
                singleText = Character.toString(mText.charAt(i));
                mCurrentHeight = rect.height() * (index + 1);
                index++;
                if (mCurrentHeight >= mHeight) {
                    mWithOnce++;
                    index = 0 + 1;
                    mCurrentHeight = rect.height();
                }
                canvas.drawText(singleText, getWidth() - 80 * mWithOnce, mCurrentHeight, mPaint);//30 是设置的单个文字大小
            }
        }
    }
}

attrs代码如下

name="VerticalTextView">
    name="tv_text" format="string" />
    name="orientation">
        name="vertical" value="1" />
        name="horizontal" value="0" />