Android(安卓)TextView 字体描边

package com.zg.mrcheney;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.util.AttributeSet;import android.widget.TextView;public class StrokeText extends TextView {    private float mBigFontBottom;    private float mBigFontHeight;    private String text;    private Paint mPaint;    private int strokeSize = 1;    public StrokeText(Context context) {        super(context);        init();    }    public StrokeText(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public StrokeText(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    private void init() {        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setTextSize(getTextSize());        mPaint.setColor(getResources().getColor(R.color.font_paint_color));        FontMetrics fm = mPaint.getFontMetrics();        mBigFontBottom = fm.bottom;        mBigFontHeight = fm.bottom - fm.top;    }    @Override    protected void onDraw(Canvas canvas) {        if (strokeSize > 0 && strokeSize < 4) {            float y = getPaddingTop() + mBigFontHeight - mBigFontBottom;            canvas.drawText(text, 0, y - strokeSize, mPaint);            canvas.drawText(text, 0, y + strokeSize, mPaint);            canvas.drawText(text, 0 + strokeSize, y, mPaint);            canvas.drawText(text, 0 + strokeSize, y + strokeSize, mPaint);            canvas.drawText(text, 0 + strokeSize, y - strokeSize, mPaint);            canvas.drawText(text, 0 - strokeSize, y, mPaint);            canvas.drawText(text, 0 - strokeSize, y + strokeSize, mPaint);            canvas.drawText(text, 0 - strokeSize, y - strokeSize, mPaint);        }        super.onDraw(canvas);    }    @Override    public void setText(CharSequence text, BufferType type) {        super.setText(text, type);        this.text = text.toString();        invalidate();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        if (strokeSize > 0 && strokeSize < 4) {            setMeasuredDimension(getMeasuredWidth() + strokeSize, getMeasuredHeight());        }    }}
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