CustomTitleView.java

package com.tekinarslan.material.sample.customui;

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

import com.apkfuns.logutils.LogUtils;
import com.tekinarslan.material.sample.R;

import java.util.HashSet;
import java.util.Random;
import java.util.Set;

/**
 * Created by cdj on 2015/5/27.
 */
public class CustomTitleView extends View {
    private static final String TAG = CustomTitleView.class.getSimpleName();
    /**
     * 文本
     */
    private String mTitleText;
    /**
     * 文本的颜色
     */
    private int mTitleTextColor;
    /**
     * 文本的大小
     */
    private int mTitleTextSize;

    /**
     * 绘制时控制文本绘制的范围
     */
    private Rect mBound;
    private Paint mPaint;

    public CustomTitleView(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public CustomTitleView(Context context)
    {
        this(context, null);
    }

    /**
     * 获得我自定义的样式属性
     *
     * @param context
     * @param attrs
     * @param defStyle
     */
    public CustomTitleView(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        /**
         * 获得我们所定义的自定义样式属性
         */
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomTitleView, defStyle, 0);
        int n = a.getIndexCount();
        for (int i = 0; i < n; i++)
        {
            int attr = a.getIndex(i);
            LogUtils.d("TypeArray==" + a.getString(i));
            switch (attr)
            {
                case R.styleable.CustomTitleView_titleText:
                    mTitleText = a.getString(attr);
                    break;
                case R.styleable.CustomTitleView_cus_titleTextColor:
                    // 默认颜色设置为黑色
                    mTitleTextColor = a.getColor(attr, Color.BLACK);
                    break;
                case R.styleable.CustomTitleView_titleTextSize:
                    // 默认设置为16sp，TypeValue也可以把sp转化为px
                    mTitleTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
                            TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
                    break;

            }

        }
        a.recycle();

        /**
         * 获得绘制文本的宽和高
         */
        mPaint = new Paint();
        mPaint.setTextSize(mTitleTextSize);
        // mPaint.setColor(mTitleTextColor);
        mBound = new Rect();
        LogUtils.d("before...........mBound"+mBound);
        mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);
        LogUtils.d("after...........mBound" + mBound);

        this.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v)
            {
                mTitleText = randomText();
                postInvalidate();
            }

        });

    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {

        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int width;
        int height ;
        if (widthMode == MeasureSpec.EXACTLY)
        {
            width = widthSize;
        } else
        {
            mPaint.setTextSize(mTitleTextSize);
            mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);
            float textWidth = mBound.width();
            int desired = (int) (getPaddingLeft() + textWidth + getPaddingRight());
            width = desired;
        }

        if (heightMode == MeasureSpec.EXACTLY)
        {
            height = heightSize;
        } else
        {
            mPaint.setTextSize(mTitleTextSize);
            mPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);
            float textHeight = mBound.height();
            int desired = (int) (getPaddingTop() + textHeight + getPaddingBottom());
            height = desired;
        }
        setMeasuredDimension(width, height);
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
//        mPaint.setColor(Color.YELLOW);
//        canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);


        int strokerWidth = 3;
        mPaint.setAntiAlias(true);
        mPaint.setStrokeWidth(6);
        mPaint.setColor(Color.CYAN);
        RectF r2=new RectF();
        mPaint.setStrokeWidth(strokerWidth);              //线宽
        mPaint.setStyle(Paint.Style.STROKE);
        r2.left=strokerWidth;                                 //左边
        r2.top=strokerWidth;                                 //上边
        r2.right=getMeasuredWidth()-strokerWidth;                                   //右边
        r2.bottom=+getMeasuredHeight()-strokerWidth;
        mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
        canvas.drawRoundRect(r2, 50, 50, mPaint);

        //绘字
        mPaint.setColor(mTitleTextColor);
        canvas.drawText(mTitleText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mPaint);

    }

    private String randomText()
    {
        Random random = new Random();
        Set<Integer> set = new HashSet<Integer>();
        while (set.size() < 4)
        {
            int randomInt = random.nextInt(10);
            set.add(randomInt);
        }
        StringBuffer sb = new StringBuffer();
        for (Integer i : set)
        {
            sb.append("" + i);
        }

        return sb.toString();
    }
}