一直都在看自定义View，经过一个星期的坚持，基本上能够写出一些比较实用的控件效果了，今天天气太热，就待在家里玩手机，然后手机没电了，在充电的时候，看到了手机的充电动画，觉得挺酷，然后自己我就仔细的分析了一下这里的动画内容，就觉得，这个我也能写出来，所以就有了这篇博客。纯属原创。
先看看效果，因为图片的原因，只能看到静态的。
这个就是效果图了。当然了，这么看好像不怎么样，但是配上了动画，还是挺好看的。
自定义控件的话，其实做的多了，运用的多了，就会觉得自定义View，跟在Photo shop 里面画图一样，我们通过建立图层，然后再图层里面绘制自己想要的效果。
这里其实也是一样的，运用到了我前面讲的一些知识，比如这篇：
Android自定义View——弧线展示图，原理上大体相当，结合这次的效果，我们看看，这里面是有四个弧形，两个圆，还有一个类似于时钟刻度的效果。所以知道这些的话，这就比较容易实现了。
首先，新建一个类，取名为VIVOPhone,然后继承自View，重载三个构造函数，然后进入主题。
同样的，我们先看看运用到了哪些变量
// 定义五个画笔private Paint mSmileRing, mBigRing, mInCrilePaint, mInLine, mTextPaint;// 控件的高宽private float mWidth, mHeight;// 矩形的空间private RectF mRectF;// 四个弧线的开始角度private float startAngle = 270, startAngle2 = 270, startAngle3 = 270,startAngle4 = 270, sweepAngle = 90;// 文字private String text = "70%";// 文字的大小private float tvSize = 80;// 刻度的进度private float progress;
然后我们开始初始化数据。
private void initView() {mSmileRing = new Paint();mSmileRing.setAntiAlias(true);mSmileRing.setStrokeWidth(5);mSmileRing.setStyle(Style.STROKE);mSmileRing.setColor(Color.parseColor("#12ADFF"));mBigRing = new Paint();mBigRing.setAntiAlias(true);mBigRing.setStrokeWidth(20);mBigRing.setStyle(Style.STROKE);mBigRing.setColor(Color.parseColor("#12ADFF"));mInCrilePaint = new Paint();mInCrilePaint.setAntiAlias(true);mInCrilePaint.setStrokeWidth((float) 0.5);mInCrilePaint.setStyle(Style.STROKE);mInCrilePaint.setColor(Color.parseColor("#eeeeee"));mInLine = new Paint();mInLine.setAntiAlias(true);mInLine.setStrokeWidth(3);mInLine.setColor(Color.parseColor("#00ff00"));mTextPaint = new Paint();mTextPaint.setAntiAlias(true);mTextPaint.setStrokeWidth(3);mTextPaint.setTextSize(tvSize);mTextPaint.setColor(Color.parseColor("#ffffff"));}
这里主要是对画笔进行初始化，包括设置大小、宽度、样式、颜色等等。这个方法，最后还是要在构造函数里面调用。
画笔初始化好了，接下来就看看怎么给变量赋值；
一样的，我们还是在onSizeChange()方法里面写赋值的操作。代码如下：
@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mWidth = w;mHeight = h;}
这里很简单，就是给高跟宽赋值。
好了，最后看看onDraw方法是怎么写的。
@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);canvasOutArc1(canvas, mRectF);canvasOutArc2(canvas, mRectF);canvasOutArc3(canvas, mRectF);canvasOutArc4(canvas, mRectF);drawCircle(canvas);drawCircleIn(canvas);canvasDrawText(canvas);}
没错，我这里把每一个的绘制都抽成了方法，这样是为了更好的管理和阅读。看到一个：
/*** 绘制最外面的弧线* * @param canvas*/private void canvasOutArc1(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.1), (float) (mWidth * 0.1),(float) (mWidth * 0.9), (float) (mWidth * 0.9));canvas.drawArc(mRectF, startAngle, sweepAngle + 90, false, mSmileRing);}
这个是最外层的圆，接下来就是第二个，第三个，第四个，我全部列出来。
/*** 绘制外层的第二个* * @param canvas* @param mRectF*/private void canvasOutArc2(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.14), (float) (mWidth * 0.14),(float) (mWidth * 0.85), (float) (mWidth * 0.85));canvas.drawArc(mRectF, startAngle2, sweepAngle + 30, false, mBigRing);}
第三个：
/*** 绘制里面第二个小的* * @param canvas*/private void canvasOutArc3(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.22), (float) (mWidth * 0.22),(float) (mWidth * 0.795), (float) (mWidth * 0.795));canvas.drawArc(mRectF, startAngle3, sweepAngle, false, mSmileRing);}
第四个：
/*** 绘制里面第二个小的* * @param canvas*/private void canvasOutArc4(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.255), (float) (mWidth * 0.255),(float) (mWidth * 0.75), (float) (mWidth * 0.75));canvas.drawArc(mRectF, startAngle4, sweepAngle, false, mBigRing);}
然后就是两个圆了：
第一个圆，这里面还包含了锯齿：
// 绘制内切圆和锯齿private void drawCircle(Canvas canvas) {float radius = (float) (mHeight - (mHeight * 0.3) * 2 - (mWidth * 0.17));float yuanX = (float) (mHeight / 2);float yuanY = (float) (mWidth / 2);canvas.drawCircle(yuanX, yuanY, radius, mInCrilePaint);canvas.save();float nowWidth = (float) (getMeasuredWidth());float nowHeight = getMeasuredHeight();for (int i = 0; i < 72; i++) {// canvas.drawLine(nowWidth / 2, nowHeight / 2 - nowWidth / 2,// nowWidth / 2, nowHeight / 2 - nowWidth / 2 + 30, mInLine);if (i >= progress) {mInLine.setColor(Color.parseColor("#555555"));} else {mInLine.setColor(Color.parseColor("#00ff00"));}canvas.drawLine(nowWidth / 2,(float) (nowHeight / 2 - nowWidth / 2 + mWidth / 3.7),nowWidth / 2, (float) (nowHeight / 2 - nowWidth / 2+ mWidth * 0.05 + mWidth / 3.7), mInLine);canvas.rotate(5, getWidth() / 2, getHeight() / 2);}}
第二个圆：
// 绘制最里面的圆private void drawCircleIn(Canvas canvas) {float radius = (float) (mHeight - (mHeight * 0.3) * 2 - (mWidth * 0.22));float yuanX = (float) (mHeight / 2);float yuanY = (float) (mWidth / 2);canvas.drawCircle(yuanX, yuanY, radius, mInCrilePaint);canvas.save();}
最后暴露给外面一个方法，用于动画效果：
public void setData(int startAngle, float d) {this.startAngle = startAngle;this.startAngle2 = 360 - startAngle;this.startAngle3 = startAngle;this.startAngle4 = 360 - startAngle;progress = d / 4;postInvalidateDelayed(500);}
这里为了效果更明显，我让它五毫秒的速度更新UI，这里就是View的全部内容，下面，我把所有的代码都列出来：
布局文件：
<RelativeLayout xmlns:android="/apk/res/android"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/bg"tools:context=".MainActivity" ><com.example.vivoopen.weight.VivoViewandroid:id="@+id/vivo"android:layout_width="180dip"android:layout_height="180dip"android:layout_centerInParent="true" /></RelativeLayout>
MainActivity.java:
public class MainActivity extends Activity {private VivoView view;private boolean isRun = true;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);view = (VivoView) findViewById(R.id.vivo);new Thread(new Runnable() {public void run() {synchronized (view) {while (isRun) {Message msg;for (int i = 0; i < n2; i = i + 10) {msg = new Message();msg.obj = i;SystemClock.sleep(100);msg.what = 1;handler.sendMessage(msg);}msg = new Message();msg.what = 2;handler.sendMessage(msg);}}}}).start();}int n2 = 2;private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {switch (msg.what) {case 1:int a = (Integer) msg.obj;view.setData(a, a);break;case 2:n2 = 359;break;default:break;}};};}
VivoView.java:
public class VivoView extends View {// 定义五个画笔private Paint mSmileRing, mBigRing, mInCrilePaint, mInLine, mTextPaint;// 控件的高宽private float mWidth, mHeight;// 矩形的空间private RectF mRectF;// 四个弧线的开始角度private float startAngle = 270, startAngle2 = 270, startAngle3 = 270,startAngle4 = 270, sweepAngle = 90;// 文字private String text = "70%";// 文字的大小private float tvSize = 80;// 刻度的进度private float progress;public VivoView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);initView();}public VivoView(Context context, AttributeSet attrs) {super(context, attrs);initView();}public VivoView(Context context) {super(context);initView();}private void initView() {mSmileRing = new Paint();mSmileRing.setAntiAlias(true);mSmileRing.setStrokeWidth(5);mSmileRing.setStyle(Style.STROKE);mSmileRing.setColor(Color.parseColor("#12ADFF"));mBigRing = new Paint();mBigRing.setAntiAlias(true);mBigRing.setStrokeWidth(20);mBigRing.setStyle(Style.STROKE);mBigRing.setColor(Color.parseColor("#12ADFF"));mInCrilePaint = new Paint();mInCrilePaint.setAntiAlias(true);mInCrilePaint.setStrokeWidth((float) 0.5);mInCrilePaint.setStyle(Style.STROKE);mInCrilePaint.setColor(Color.parseColor("#eeeeee"));mInLine = new Paint();mInLine.setAntiAlias(true);mInLine.setStrokeWidth(3);mInLine.setColor(Color.parseColor("#00ff00"));mTextPaint = new Paint();mTextPaint.setAntiAlias(true);mTextPaint.setStrokeWidth(3);mTextPaint.setTextSize(tvSize);mTextPaint.setColor(Color.parseColor("#ffffff"));}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mWidth = w;mHeight = h;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);canvasOutArc1(canvas, mRectF);canvasOutArc2(canvas, mRectF);canvasOutArc3(canvas, mRectF);canvasOutArc4(canvas, mRectF);drawCircle(canvas);drawCircleIn(canvas);canvasDrawText(canvas);}// 绘制文字private void canvasDrawText(Canvas canvas) {float textSize = mTextPaint.measureText(text);float x = mWidth / 2 - textSize / 2;float y = mHeight / 2 + textSize / 5;canvas.drawText(text, x, y, mTextPaint);}// 绘制最里面的圆// 绘制内切圆和锯齿private void drawCircleIn(Canvas canvas) {float radius = (float) (mHeight - (mHeight * 0.3) * 2 - (mWidth * 0.22));float yuanX = (float) (mHeight / 2);float yuanY = (float) (mWidth / 2);canvas.drawCircle(yuanX, yuanY, radius, mInCrilePaint);canvas.save();}// 绘制内切圆和锯齿private void drawCircle(Canvas canvas) {float radius = (float) (mHeight - (mHeight * 0.3) * 2 - (mWidth * 0.17));float yuanX = (float) (mHeight / 2);float yuanY = (float) (mWidth / 2);canvas.drawCircle(yuanX, yuanY, radius, mInCrilePaint);canvas.save();float nowWidth = (float) (getMeasuredWidth());float nowHeight = getMeasuredHeight();for (int i = 0; i < 72; i++) {// canvas.drawLine(nowWidth / 2, nowHeight / 2 - nowWidth / 2,// nowWidth / 2, nowHeight / 2 - nowWidth / 2 + 30, mInLine);if (i >= progress) {mInLine.setColor(Color.parseColor("#555555"));} else {mInLine.setColor(Color.parseColor("#00ff00"));}canvas.drawLine(nowWidth / 2,(float) (nowHeight / 2 - nowWidth / 2 + mWidth / 3.7),nowWidth / 2, (float) (nowHeight / 2 - nowWidth / 2+ mWidth * 0.05 + mWidth / 3.7), mInLine);canvas.rotate(5, getWidth() / 2, getHeight() / 2);}}/*** 绘制最外面的弧线* * @param canvas*/private void canvasOutArc1(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.1), (float) (mWidth * 0.1),(float) (mWidth * 0.9), (float) (mWidth * 0.9));canvas.drawArc(mRectF, startAngle, sweepAngle + 90, false, mSmileRing);}/*** 绘制外层的第二个* * @param canvas* @param mRectF*/private void canvasOutArc2(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.14), (float) (mWidth * 0.14),(float) (mWidth * 0.85), (float) (mWidth * 0.85));canvas.drawArc(mRectF, startAngle2, sweepAngle + 30, false, mBigRing);}/*** 绘制里面第二个小的* * @param canvas*/private void canvasOutArc3(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.22), (float) (mWidth * 0.22),(float) (mWidth * 0.795), (float) (mWidth * 0.795));canvas.drawArc(mRectF, startAngle3, sweepAngle, false, mSmileRing);}/*** 绘制里面第二个小的* * @param canvas*/private void canvasOutArc4(Canvas canvas, RectF mRectF) {mRectF = new RectF((float) (mWidth * 0.255), (float) (mWidth * 0.255),(float) (mWidth * 0.75), (float) (mWidth * 0.75));canvas.drawArc(mRectF, startAngle4, sweepAngle, false, mBigRing);}public void setData(int startAngle, float d) {this.startAngle = startAngle;this.startAngle2 = 360 - startAngle;this.startAngle3 = startAngle;this.startAngle4 = 360 - startAngle;progress = d / 4;postInvalidateDelayed(500);}}
好了，所有的代码都列出来了，有什么不懂的可以在下方留言，如果有更好的想法，也可以分享一下哈。最后，祝大家周末愉快！
