周四课余时间比较多,正好前几天为了给小学弟解决问题,回顾了一些Android的知识,(上学还是不能把以前上班学到的东西丢掉)于是写一篇关于自定义view的文章。
这篇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
提示:以下是本篇文章正文内容
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:
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:
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
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 } }
1.新建attrs文件
2.定义属性
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(); }
最后运行一下看一下效果
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
<&#63;xml version="1.0" encoding="utf-8"&#63;>
希望能够对您有所帮助。如有疑问可留言。欢迎各位前辈点评
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