自定义加载loading view动画组件的使用。

在github上找的一个有点酷炫的loading动画https://github.com/Fichardu/CircleProgress

我写写使用步骤

自定义view（CircleProgress ）的代码

package com.hysmarthotel.view;

import com.hysmarthotel.roomcontrol.R;
import com.hysmarthotel.util.EaseInOutCubicInterpolator;

import android.animation.TimeInterpolator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AnimationUtils;

public class CircleProgress extends View {

    private static final int RED = 0xFFE5282C;
    private static final int YELLOW = 0xFF1F909A;
    private static final int BLUE = 0xFFFC9E12;
    private static final int COLOR_NUM = 3;
    private int[] COLORS;
    private TimeInterpolator mInterpolator = new EaseInOutCubicInterpolator();

    private final double DEGREE = Math.PI / 180;
    private Paint mPaint;
    private int mViewSize;
    private int mPointRadius;
    private long mStartTime;
    private long mPlayTime;
    private boolean mStartAnim = false;
    private Point mCenter = new Point();

    private ArcPoint[] mArcPoint;
    private static final int POINT_NUM = 15;
    private static final int DELTA_ANGLE = 360 / POINT_NUM;
    private long mDuration = 3600;

    public CircleProgress(Context context) {
        super(context);
        init(null, 0);
    }

    public CircleProgress(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(attrs, 0);
    }

    public CircleProgress(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(attrs, defStyle);
    }

    private void init(AttributeSet attrs, int defStyle) {
        mArcPoint = new ArcPoint[POINT_NUM];

        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.FILL);

        TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.CircleProgress, defStyle, 0);
        int color1 = a.getColor(R.styleable.CircleProgress_color1, RED);
        int color2 = a.getColor(R.styleable.CircleProgress_color2, YELLOW);
        int color3 = a.getColor(R.styleable.CircleProgress_color3, BLUE);
        a.recycle();

        COLORS = new int[]{color1, color2, color3};
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int defaultSize = getResources().getDimensionPixelSize(R.dimen.default_circle_view_size);
        int width = getDefaultSize(defaultSize, widthMeasureSpec);
        int height = getDefaultSize(defaultSize, heightMeasureSpec);
        mViewSize = Math.min(width, height);
        setMeasuredDimension(mViewSize, mViewSize);
        mCenter.set(mViewSize / 2, mViewSize / 2);

        calPoints(1.0f);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.save();
        canvas.translate(mCenter.x, mCenter.y);

        float factor = getFactor();
        canvas.rotate(36 * factor);
        float x, y;
        for (int i = 0; i < POINT_NUM; ++i) {
            mPaint.setColor(mArcPoint[i].color);
            float itemFactor = getItemFactor(i, factor);
            x = mArcPoint[i].x - 2 * mArcPoint[i].x * itemFactor;
            y = mArcPoint[i].y - 2 * mArcPoint[i].y * itemFactor;
            canvas.drawCircle(x, y, mPointRadius, mPaint);
        }

        canvas.restore();

        if (mStartAnim) {
            postInvalidate();
        }
    }

    private void calPoints(float factor) {
        int radius = (int) (mViewSize / 3 * factor);
        mPointRadius = radius / 12;

        for (int i = 0; i < POINT_NUM; ++i) {
            float x = radius * -(float) Math.sin(DEGREE * DELTA_ANGLE * i);
            float y = radius * -(float) Math.cos(DEGREE * DELTA_ANGLE * i);

            ArcPoint point = new ArcPoint(x, y, COLORS[i % COLOR_NUM]);
            mArcPoint[i] = point;
        }
    }


    private float getFactor() {
        if (mStartAnim) {
            mPlayTime = AnimationUtils.currentAnimationTimeMillis() - mStartTime;
        }
        float factor = mPlayTime / (float) mDuration;
        return factor % 1f;
    }

    private float getItemFactor(int index, float factor) {
        float itemFactor = (factor - 0.66f / POINT_NUM * index) * 3;
        if (itemFactor < 0f) {
            itemFactor = 0f;
        } else if (itemFactor > 1f) {
            itemFactor = 1f;
        }
        return mInterpolator.getInterpolation(itemFactor);
    }

    public void startAnim() {
        mPlayTime = mPlayTime % mDuration;
        mStartTime = AnimationUtils.currentAnimationTimeMillis() - mPlayTime;
        mStartAnim = true;
        postInvalidate();
    }

    public void reset() {
        stopAnim();
        mPlayTime = 0;
        postInvalidate();

    }

    public void stopAnim() {
        mStartAnim = false;
    }

    public void setInterpolator(TimeInterpolator interpolator) {
        mInterpolator = interpolator;
    }

    public void setDuration(long duration) {
        mDuration = duration;
    }

    public void setRadius(float factor) {
        stopAnim();
        calPoints(factor);
        startAnim();
    }

    static class ArcPoint {
        float x;
        float y;
        int color;

        ArcPoint(float x, float y, int color) {
            this.x = x;
            this.y = y;
            this.color = color;
        }
    }

}

EaseInOutCubicInterpolator是自定义view（CircleProgress ）中要是用的一个工具

package com.hysmarthotel.util;

import android.animation.TimeInterpolator;


public class EaseInOutCubicInterpolator implements TimeInterpolator {

    @Override
    public float getInterpolation(float input) {
        if ((input *= 2) < 1.0f) {
            return 0.5f * input * input * input;
        }
        input -= 2;
        return 0.5f * input * input * input + 1;
    }

}

在activity中的调用（还有一些其他用法可以自己看看github上的源代码）

mProgressView = (CircleProgress)findViewById(R.id.progress_vie);
mProgressView.startAnim();  //开始

mProgressView.stopAnim();  //结束

mProgressView.setRadius(factor);  //半径

mProgressView.reset();  //复原

在xml文件中的布局

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:circleprogress="http://schemas.android.com/apk/res/com.hysmarthotel.roomcontrol"      //这个地方记得要加   //包名
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg1" >
    
    <com.hysmarthotel.view.CircleProgress                                                                         //类名
        android:id="@+id/progress_vie"
        android:layout_x="350.5px"
        android:layout_y="150.0px"
        android:layout_width="1140.0px"
        android:layout_height="700.0px"
        circleprogress:color1="@android:color/holo_red_light"           //这些参数就是通过xmlns:circleprogress，和attrs文件相关联的

 　　　　circleprogress:color2="@android:color/holo_green_light"

 　　　　circleprogress:color3="@android:color/holo_blue_light" />

自己在values目录中新建的attrs文件，这是与自定义view中自定义参数相关的

    <declare-styleable name="CircleProgress">
        <attr name="color1" format="reference|color"/>
        <attr name="color2" format="reference|color"/>
        <attr name="color3" format="reference|color"/>
    </declare-styleable>

自己在values目录中新建的dimens文件，这个只是几个颜色参数

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="default_circle_view_size">200dp</dimen>
</resources>