Android实现仿iOS菊花加载圈动画效果
目录
- 常见的实现方式
- 效果图:
- 完整代码
- 布局代码
常见的实现方式
- 切图,做旋转动画
- 自定义View,绘制效果
- gif图
1、切图会增加体积,但相对简单,不过在换肤的场景下,会使用不同颜色,需要准备多张图,不够灵活。
2、由于自定义的好处,不同颜色只需要提供自定义属性,换肤时切换属性设置即可,比较灵活。
3、gif图普遍比较大,而且加载gif没有原生支持,需要引入第三方库,而且消耗内存比较大,不推荐。
效果图:
完整代码
自定义属性:
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="ActivityIndicatorView"> <!-- 菊花颜色 --> <attr name="aiv_color" format="color" /> <!-- 开始角度 --> <attr name="aiv_startAngle" format="integer" /> <!-- 线条宽度 --> <attr name="aiv_strokeWidth" format="dimension" /> <!-- 是否自动开始 --> <attr name="aiv_auto_start" format="boolean" /> </declare-styleable> </resources>
Java代码实现过程:
public class ActivityIndicatorView extends View { /** * 菊花颜色 */ private int mColor = Color.argb(255, 255, 255, 255); /** * 开始角度 */ private int mStartAngle = 0; /** * 每条线的宽度 */ private float mStrokeWidth = 0; /** * 是否自动开始旋转 */ private boolean isAutoStart; /** * 一共多少条先 */ private final int mLineCount = 12; private final int minAlpha = 0; /** * 每一条线叠加的 */ private final int mAngleGradient = 360 / mLineCount; /** * 每条线的颜色 */ private int[] mColors = new int[mLineCount]; /** * 画笔 */ private Paint mPaint; /** * 动画Handler */ private Handler mAnimHandler = new Handler(Looper.getMainLooper()); /** * 动画任务 */ private Runnable mAnimRunnable = new Runnable() { @Override public void run() { mStartAngle += mAngleGradient; invalidate(); mAnimHandler.postDelayed(mAnimRunnable, 50); } }; public ActivityIndicatorView(Context context) { this(context, null); } public ActivityIndicatorView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ActivityIndicatorView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); setup(context, attrs, defStyleAttr, 0); } private void setup(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ActivityIndicatorView, defStyleAttr, defStyleRes); mColor = typedArray.getColor(R.styleable.ActivityIndicatorView_aiv_color, mColor); mStartAngle = typedArray.getInt(R.styleable.ActivityIndicatorView_aiv_startAngle, mStartAngle); mStrokeWidth = typedArray.getDimension(R.styleable.ActivityIndicatorView_aiv_strokeWidth, mStrokeWidth); isAutoStart = typedArray.getBoolean(R.styleable.ActivityIndicatorView_aiv_auto_start, true); typedArray.recycle(); initialize(); } private void initialize() { mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); int alpha = Color.alpha(mColor); int red = Color.red(mColor); int green = Color.green(mColor); int blue = Color.blue(mColor); int alphaGradient = Math.abs(alpha - minAlpha) / mLineCount; for (int i = 0; i < mColors.length; i++) { mColors[i] = Color.argb(alpha - alphaGradient * i, red, green, blue); } mPaint.setStrokeCap(Paint.Cap.ROUND); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int centerX = getWidth() / 2; int centerY = getHeight() / 2; float radius = Math.min(getWidth() - getPaddingLeft() - getPaddingRight(), getHeight() - getPaddingTop() - getPaddingBottom()) * 0.5f; if (mStrokeWidth == 0) { mStrokeWidth = pointX(mAngleGradient / 2, radius / 2) / 2; } mPaint.setStrokeWidth(mStrokeWidth); for (int i = 0; i < mColors.length; i++) { mPaint.setColor(mColors[i]); canvas.drawLine( centerX + pointX(-mAngleGradient * i + mStartAngle, radius / 2), centerY + pointY(-mAngleGradient * i + mStartAngle, radius / 2), //这里计算Y值时, 之所以减去线宽/2, 是防止没有设置的Padding时,图像会超出View范围 centerX + pointX(-mAngleGradient * i + mStartAngle, radius - mStrokeWidth / 2), //这里计算Y值时, 之所以减去线宽/2, 是防止没有设置的Padding时,图像会超出View范围 centerY + pointY(-mAngleGradient * i + mStartAngle, radius - mStrokeWidth / 2), mPaint); } } private float pointX(int angle, float radius) { return (float) (radius * Math.cos(angle * Math.PI / 180)); } private float pointY(int angle, float radius) { return (float) (radius * Math.sin(angle * Math.PI / 180)); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); if (isAutoStart) { start(); } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); if (mAnimHandler != null) { stop(); } } /** * 开始动画 */ public void start() { mAnimHandler.post(mAnimRunnable); } /** * 停止动画 */ public void stop() { mAnimHandler.removeCallbacks(mAnimRunnable); } /** * 设置菊花颜色 */ public void setColor(int color) { this.mColor = color; } /** * 设置线宽 */ public void setStrokeWidth(float strokeWidth) { this.mStrokeWidth = strokeWidth; } /** * 设置开始的角度 */ public void setStartAngle(int startAngle) { this.mStartAngle = startAngle; } }
布局代码
布局中添加控件,适当时候显示、隐藏即可,最好都设置宽、高、颜色以及线宽,默认效果比较不符合使用。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <com.tongwei.bootrunsample.base.widget.ActivityIndicatorView android:id="@+id/activity_indicator" android:layout_width="25dp" android:layout_height="25dp" android:layout_gravity="center" android:layout_centerInParent="true" app:aiv_color="#A2A3B0" app:aiv_strokeWidth="2.5dp" /> </RelativeLayout>
到这里就结束了.
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