Android自定义view之太极图

啊啊啊,好久不见,快到了期末考试的时间了,还是要准备一下,哈哈哈哈,废话不多说,今天写一篇关于自定义view的文章。(主要内容为使用Canvas画简单图案,自定义属性,以及属性动画ObjectAnimator中的旋转动画)

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先看一下最后完成的样子(可旋转)

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正文

NO.1

先画一个太极       

先介绍一下定义的东西:

    private int useWidth;  //最后测量得到的值    private int leftcolor; //左太极的颜色(黑)    private int rightcolor;//右太极的颜色(白)

1.第一步,画一个半边黑半边白的圆

        mPaint.setColor(leftcolor);        canvas.drawArc(new RectF(0, 0, useWidth, useWidth), 270, -180, true, mPaint);
mPaint.setColor(rightcolor); canvas.drawArc(new RectF(0, 0, useWidth, useWidth), 270, 180, true, mPaint);

效果:

图片

2.第二步,画黑白两个小圆

        mPaint.setColor(leftcolor);        canvas.drawArc(new RectF(useWidth / 4, 0, useWidth / 2 +useWidth / 4, useWidth / 2),                270, 360, true, mPaint);
mPaint.setColor(rightcolor); canvas.drawArc(new RectF(useWidth / 4, useWidth / 2, useWidth / 2 + useWidth / 4,useWidth), 270, 360, true, mPaint);

效果:

图片

3.第三步,画黑白两个更小的圆

        mPaint.setColor(leftcolor);        canvas.drawCircle(useWidth/ 2, useWidth * 3 / 4, useWidth/16, mPaint);
mPaint.setColor(rightcolor); canvas.drawCircle(useWidth / 2, useWidth / 4, useWidth/16, mPaint);

效果:

图片

NO.2

让太极旋转

先简单介绍一下定义的东西

  private ObjectAnimator objectAnimator;//属性动画  private int animaltime;//动画的旋转时间(速度)

1.旋转的开始方法

//旋转动画开始的方法    public void createAnimation() {        if (objectAnimator==null){            objectAnimator = ObjectAnimator.ofFloat(this, "rotation", 0f, 360f);//添加旋转动画,旋转中心默认为控件中点            objectAnimator.setDuration(animaltime);//设置动画时间            objectAnimator.setInterpolator(new LinearInterpolator());//动画时间线性渐变            objectAnimator.setRepeatCount(ObjectAnimator.INFINITE);            objectAnimator.setRepeatMode(ObjectAnimator.RESTART);            objectAnimator.start();//动画开始        }else{            objectAnimator.resume();//动画继续开始        }

}

2.旋转的暂停方法(可继续旋转)

    public  void stopAnimation(){        if (objectAnimator!=null){            objectAnimator.pause();//动画暂停  .end()结束动画        }    }

3.旋转的停止方法(不可继续旋转)

    public  void cleanAnimation(){        if (objectAnimator!=null){            objectAnimator.end(); //结束动画        }    }

NO.3

自定义属性(颜色,动画速度)

1.新建attrs文件

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2.定义属性

   <declare-styleable name="TaiJiView">        <attr name="leftcolor" format="reference|color"/>        <attr name="rightcolor" format="reference|color"/>        <attr name="animaltime" format="integer"/>    </declare-styleable>

3.布局中使用

        app:leftcolor="@color/colorAccent"        app:rightcolor="@color/colorPrimaryDark"        app:animaltime="3000"

4..java文件中获取在布局中定义的值

 /**     获取自定义属性     */    private void initCustomAttrs(Context context, AttributeSet attrs) {        //获取自定义属性。        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TaiJiView);        //获取太极颜色        leftcolor = ta.getColor(R.styleable.TaiJiView_leftcolor, Color.BLACK);        rightcolor=ta.getColor(R.styleable.TaiJiView_rightcolor, Color.WHITE);        //时间        animaltime=ta.getInt(R.styleable.TaiJiView_animaltime,1000);
//回收 ta.recycle();
}

最后运行,看一下效果

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NO.4

源码

1.TaiJiView.java

public class TaiJiView extends View{    private Paint mPaint;    private int mWidth;    private int mHeight;    private int useWidth;    private int leftcolor;    private int rightcolor;    private ObjectAnimator objectAnimator;    private int animaltime;    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)    public TaiJiView(Context context) {        this(context,null);    }
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public TaiJiView(Context context, @Nullable AttributeSet attrs) { this(context, attrs,0); }
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public TaiJiView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { this(context, attrs, defStyleAttr,0); initCustomAttrs(context,attrs); }
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public TaiJiView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); init();
} private void init() { initPaint(); }

/** 获取自定义属性 */ private void initCustomAttrs(Context context, AttributeSet attrs) { //获取自定义属性。 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TaiJiView); //获取太极颜色 leftcolor = ta.getColor(R.styleable.TaiJiView_leftcolor, Color.BLACK); rightcolor=ta.getColor(R.styleable.TaiJiView_rightcolor, Color.WHITE); animaltime=ta.getInt(R.styleable.TaiJiView_animaltime,1000);
//回收 ta.recycle();
} /** * 初始化画笔 */ private void initPaint() { mPaint = new Paint(); //创建画笔对象 mPaint.setColor(Color.BLACK); //设置画笔颜色 mPaint.setStyle(Paint.Style.FILL); //设置画笔模式为填充 mPaint.setStrokeWidth(10f); //设置画笔宽度为10px mPaint.setAntiAlias(true); //设置抗锯齿 mPaint.setAlpha(255); //设置画笔透明度 }
@Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = w; mHeight = h; useWidth=mWidth; if (mWidth>mHeight){ useWidth=mHeight; } }

@RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mPaint.setColor(leftcolor); canvas.drawArc(new RectF(0, 0, useWidth, useWidth), 270, -180, true, mPaint);
mPaint.setColor(rightcolor); canvas.drawArc(new RectF(0, 0, useWidth, useWidth), 270, 180, true, mPaint);
mPaint.setColor(leftcolor); canvas.drawArc(new RectF(useWidth / 4, 0, useWidth / 2 +useWidth / 4, useWidth / 2), 270, 360, true, mPaint);
mPaint.setColor(rightcolor); canvas.drawArc(new RectF(useWidth / 4, useWidth / 2, useWidth / 2 + useWidth / 4,useWidth), 270, 360, true, mPaint); mPaint.setColor(leftcolor); canvas.drawCircle(useWidth/ 2, useWidth * 3 / 4, useWidth/16, mPaint);
mPaint.setColor(rightcolor); canvas.drawCircle(useWidth / 2, useWidth / 4, useWidth/16, mPaint);
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT) public void createAnimation() { if (objectAnimator==null){ objectAnimator = ObjectAnimator.ofFloat(this, "rotation", 0f, 360f);//添加旋转动画,旋转中心默认为控件中点 objectAnimator.setDuration(animaltime);//设置动画时间 objectAnimator.setInterpolator(new LinearInterpolator());//动画时间线性渐变 objectAnimator.setRepeatCount(ObjectAnimator.INFINITE); objectAnimator.setRepeatMode(ObjectAnimator.RESTART); objectAnimator.start();//动画开始 }else{ objectAnimator.resume();//动画继续开始 }

} @RequiresApi(api = Build.VERSION_CODES.KITKAT) public void stopAnimation(){ if (objectAnimator!=null){ objectAnimator.pause();//动画暂停 .end()结束动画 } } public void cleanAnimation(){ if (objectAnimator!=null){ objectAnimator.end(); //结束动画 } }}

2.attrs文件

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="TaiJiView">        <attr name="leftcolor" format="reference|color"/>        <attr name="rightcolor" format="reference|color"/>        <attr name="animaltime" format="integer"/>    </declare-styleable></resources>

我们下一篇文章见!!!

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