Android自定义View——仿ViVO X6 极速闪充动画效果

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：

    @Override
    protected 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。

    @Override
    protected 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：

"http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg"
    tools:context=".MainActivity" >

    <com.example.vivoopen.weight.VivoView
        android:id="@+id/vivo"
        android:layout_width="180dip"
        android:layout_height="180dip"
        android:layout_centerInParent="true" />

MainActivity.java:

public class MainActivity extends Activity {
    private VivoView view;
    private boolean isRun = true;

    @Override
    protected 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"));
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mWidth = w;
        mHeight = h;

    }

    @Override
    protected 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！