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实现360手机助手TabHost的波纹效果

Android互联网报道阅读(78)2019-06-04 收藏0次评论

现在新版360手机助手的界面都做得挺漂亮的,在切换底部导航时的波纹效果也很好看,刚好最近看了个开源项目才了解到原来Drawable做动画效果也怎么好用,所以就仿照360实现了下带波纹的TabHost。源代码地址:https://github.com/Rukey7/XFragmentTabHost

先来看一下实现后的效果:

说明一下实现要点:

1. 因为我们项目之前用的是FragmentTabHost,所以我直接继承FragmentTabHost来实现动画效果更方便;

2. 波纹动画的实现其实是自定义带动画效果的Drawable,然后将Drawable设置为Tab菜单的背景;

3. 其它的就是一些Tab菜单切换的处理了。

一. 自定义波纹Drawable

 

自定义Drawable只要继承Drawable并实现以下4个方法,同时实现Animatable接口:

 

public class RippleDrawable extends Drawable implements Animatable {
    @Override
    public void draw(Canvas canvas) {
        // 绘图
    }

    @Override
    public void setAlpha(int alpha) {
        // 设置透明度
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        // 设置颜色过滤
    }

    @Override
    public int getOpacity() {
        // 设置颜色格式
        return PixelFormat.RGBA_8888;
    }

    @Override
    public void start() {
        // 启动动画
    }

    @Override
    public void stop() {
        // 停止动画
    }

    @Override
    public boolean isRunning() {
        // 判断动画是否运行
        return false;
    }
}

这几个方法中最重要的就是draw()方法了,相信自定义过View的都知道我们图形就是在这里绘制,这里也一样,其它方法在这里影响不大,最后一个方法用来设置Drawable的颜色格式。要实现动画Drawable需要实现Animatable接口,并实现3个方法如下,其实不实现这个接口也能做动画效果,但还是实现比较好。

 

下面是整个波纹Drawable的实现代码:

/**
 * Created by long on 2016/6/27.
 * 波纹Drawable
 */
public class RippleDrawable extends Drawable implements Animatable {

    /**
     * 3种模式:左边、中间和右边波纹
     */
    public static final int MODE_LEFT = 1;
    public static final int MODE_MIDDLE = 2;
    public static final int MODE_RIGHT = 3;

    private int mMode = MODE_MIDDLE;
    // 前景色和后景色画笔
    private Paint mPaintFront;
    private Paint mPaintBehind;
    // 用来绘制扇形的矩形框
    private RectF mRect;
    // 目标View的宽高的一半
    private int mHalfWidth;
    private int mHalfHeight;
    // 扩散半径
    private int mRadius;
    // 前景色和背景色的分割距离
    private int mDivideSpace;
    // 扩散满视图需要的距离,中点到斜角的距离
    private int mFullSpace;
    // 动画控制
    private ValueAnimator mValueAnimator;


    public RippleDrawable(int frontColor, int behindColor, int mode) {
        mPaintFront = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaintFront.setColor(frontColor);
        mPaintBehind = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaintBehind.setColor(behindColor);
        mRect = new RectF();
        mMode = mode;
    }

    @Override
    public void draw(Canvas canvas) {
        if (mRadius > mHalfWidth) {
            int count = canvas.save();
            canvas.drawCircle(mHalfWidth, mHalfHeight, mHalfWidth, mPaintBehind);
            canvas.restoreToCount(count);
            count = canvas.save();
            canvas.drawCircle(mHalfWidth, mHalfHeight, mDivideSpace, mPaintFront);
            canvas.restoreToCount(count);
        } else if (mRadius > mDivideSpace) {
            int count = canvas.save();
            canvas.drawCircle(mHalfWidth, mHalfHeight, mRadius, mPaintBehind);
            canvas.restoreToCount(count);
            count = canvas.save();
            canvas.drawCircle(mHalfWidth, mHalfHeight, mDivideSpace, mPaintFront);
            canvas.restoreToCount(count);
        } else {
            canvas.drawCircle(mHalfWidth, mHalfHeight, mRadius, mPaintFront);
        }

        // 左右两边才进行扇形绘制
        if (mMode != MODE_MIDDLE) {
            mRect.left = mHalfWidth - mRadius;
            mRect.right = mHalfWidth + mRadius;
            mRect.top = mHalfHeight - mRadius;
            mRect.bottom = mHalfHeight + mRadius;
        }
        if (mMode == MODE_LEFT) {
            canvas.drawArc(mRect, 90, 180, true, mPaintFront);
        } else if (mMode == MODE_RIGHT) {
            canvas.drawArc(mRect, -90, 180, true, mPaintFront);
        }
    }

    @Override
    public void setAlpha(int alpha) {
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
    }

    @Override
    public int getOpacity() {
        return PixelFormat.RGBA_8888;
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
        mHalfHeight = (bounds.bottom - bounds.top) / 2;
        mHalfWidth = (bounds.right - bounds.left) / 2;
        mDivideSpace = Math.max(mHalfHeight, mHalfWidth) * 3 / 4;
        mFullSpace = (int) Math.sqrt(mHalfWidth * mHalfWidth + mHalfHeight * mHalfHeight);
        // 属性动画
        mValueAnimator = ValueAnimator.ofInt(0, mFullSpace);
        mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mRadius = (int) animation.getAnimatedValue();
                invalidateSelf();
            }
        });
        mValueAnimator.setDuration(200);
        start();
    }


    @Override
    public void start() {
        mValueAnimator.start();
    }

    @Override
    public void stop() {
        mValueAnimator.end();
    }

    @Override
    public boolean isRunning() {
        return mValueAnimator != null && mValueAnimator.isRunning();
    }
}

整体还是比较简单的,主要就是绘图那里需要绘制3个图形,一个前景色的圆形、一个后景色的圆形和左右两边的扇形。在绘制前需要计算前景色和后景色绘制的半径,中点都为Tab视图的中心。这里需要实现onBoundsChange(Rect bounds)方法,在这里可以获取到Tab菜单项的尺寸信息,这里的mDivideSpace是前景色圆形的半径,也就是前景和后景的分割距离,而后景色圆形半径为Tab项宽度的一半。最后就剩下左右两边需要填充Tab边角的扇形半径mFullSpace了,距离就是中心到Tab边角点的距离了。

 

当然了,要实现动画效果肯定不止这些,还有一个重要的ValueAnimator,通过它来控制波纹的扩散半径,用法还是很简单的,用过属性动画的应该都不陌生。这里面需要注意的是里面调用了一个方法invalidateSelf() ,Drawable是通过这个方法来进行重绘的,它会重新调用draw()方法来实现波纹效果。

二. 实现扩展的FragmentTabHost

要实现扩展的FragmentTabHost需要继承它并实现一个重要的方法setCurrentTab(int index),当FragmentTabHost在选择Tab菜单时会调用该方法,在这方法里我们可以得到当前选中的项和之前选中的项,并做动画处理。

在实现FragmentTabHost之前,我们的Tab菜单布局生成也通过这里实现,并提供方法让外面调用,首先是菜单布局:

 


android:background="?selectableItemBackgroundBorderless" android:id="@+id/tab_layout" android:layout_height="@dimen/tab_height" android:layout_width="match_parent" android:minwidth="@dimen/tab_min_width" android:orientation="vertical" android:paddingbottom="@dimen/tab_padding_bottom" android:paddingtop="@dimen/tab_padding_top_inactive" xmlns:android="https://schemas.android.com/apk/res/android">

    

    

这个很简单,就是图标和标题,和正常使用没区别。然后是Tab菜单类:

 

 

/**
 * Created by long on 2016/4/15.
 * Tab项
 */
public class TabItem {

    private String title;
    private int imageRes;

    public TabItem(String title, int imageRes) {
        this.title = title;
        this.imageRes = imageRes;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getImageRes() {
        return imageRes;
    }

    public void setImageRes(int imageRes) {
        this.imageRes = imageRes;
    }
}

同样很简单,和布局文件对应一个图标和一个标题。

 

最后看下扩展FragmentTabHost的实现:

 

/**
 * Created by long on 2016/4/15.
 * 扩展TabHost
 */
public class XFragmentTabHost extends FragmentTabHost {

    private Context mContext;
    private List mTabViews;
    private List mTabItems;
    // 字体激活颜色
    private int mTextActiveColor;
    private int mTextInactiveColor;
    // 字体激活大小
    private float mTextActiveSize;
    private float mTextInactiveSize;
    // 视图激活对顶部的偏移
    private int mViewActivePaddingTop;
    private int mViewInactivePaddingTop;
    // 波纹模式的前景颜色和后景颜色
    private int mFrontColor;
    private int mBehindColor;
    // TabHost模式
    private TabMode mTabMode;


    public XFragmentTabHost(Context context) {
        super(context);
        _init(context);
    }

    public XFragmentTabHost(Context context, AttributeSet attrs) {
        super(context, attrs);
        _init(context);
    }

    private void _init(Context context) {
        mTabViews = new ArrayList<>();
        mTabItems = new ArrayList<>();
        mContext = context;
        mTextActiveColor = ContextCompat.getColor(mContext, R.color.colorActive);
        mTextInactiveColor = ContextCompat.getColor(mContext, R.color.colorInactive);
        mFrontColor = ContextCompat.getColor(mContext, R.color.colorFront);
        mBehindColor = ContextCompat.getColor(mContext, R.color.colorBehind);
        mTextActiveSize = getResources().getDimension(R.dimen.tab_text_size_active);
        mTextInactiveSize = getResources().getDimension(R.dimen.tab_text_size_inactive);
        mViewActivePaddingTop = (int) getResources().getDimension(R.dimen.tab_padding_top_active);
        mViewInactivePaddingTop = (int) getResources().getDimension(R.dimen.tab_padding_top_inactive);
        mTabMode = TabMode.MoveToTop;
    }

    /**
     * 覆写父类接口,并在这里做些动画特效
     * @param index 当前选中的Tab项
     */
    @Override
    public void setCurrentTab(int index) {
        // 获取之前选中的index
        int lastIndex = getCurrentTab();
        super.setCurrentTab(index);
        // 选中不同的Tab项才做切换处理
        if (lastIndex != index) {
            _switchTab(lastIndex, index);
        }
    }

    /**
     * 添加TabItem
     * @param item  TabItem
     * @param fragClass fragment类名
     * @param bundle 传给fragment的参数
     */
    public void addTabItem(TabItem item, Class fragClass, Bundle bundle) {
        mTabItems.add(item);
        View view = _getIndicator(item);
        mTabViews.add(view);
        this.addTab(newTabSpec(item.getTitle()).setIndicator(view), fragClass, bundle);
    }

    /**
     * 获取TabItem视图
     * @param item TabItem
     * @return
     */
    private View _getIndicator(TabItem item) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.tab_indicator, null);
        ImageView imageView = (ImageView) view.findViewById(R.id.tab_icon);
        TextView title = (TextView) view.findViewById(R.id.tab_title);
        imageView.setImageResource(item.getImageRes());
        title.setText(item.getTitle());
        title.setTextColor(mTextInactiveColor);
        return view;
    }

    /**
     * 切换Tab
     * @param lastIndex 上一个选中索引
     * @param nextIndex 下一个选中索引
     */
    private void _switchTab(int lastIndex, int nextIndex) {
        for (int i = 0; i < mTabViews.size(); i++) {
            if (i == lastIndex) {
                _doRipple(i, false);
            } else if (i == nextIndex) {
                _doRipple(i, true);
            }
        }
    }

    /**
     * 波纹处理
     * @param index 索引
     * @param isActivated 是否激活
     */
    private void _doRipple(int index, boolean isActivated) {
        View view = mTabViews.get(index);
        View tabView = view.findViewById(R.id.tab_layout);
        TextView title = (TextView) view.findViewById(R.id.tab_title);
        if (index == 0) {
            _rippleDrawable(tabView, mFrontColor, mBehindColor, RippleDrawable.MODE_LEFT, isActivated);
        } else if (index == (mTabViews.size() - 1)){
            _rippleDrawable(tabView, mFrontColor, mBehindColor, RippleDrawable.MODE_RIGHT, isActivated);
        } else {
            _rippleDrawable(tabView, mFrontColor, mBehindColor, RippleDrawable.MODE_MIDDLE, isActivated);
        }
        if (isActivated) {
            title.setTextColor(mTextActiveColor);
        } else {
            title.setTextColor(mTextInactiveColor);
        }
    }

    /**
     * 波纹动画
     * @param view
     * @param frontColor
     * @param behindColor
     * @param mode
     * @param isActivated
     */
    @SuppressWarnings("deprecation")
    private void _rippleDrawable(final View view, int frontColor, int behindColor, int mode, boolean isActivated) {
        if (isActivated) {
            RippleDrawable rippleDrawable = new RippleDrawable(frontColor, behindColor, mode);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                view.setBackground(rippleDrawable);
            } else {
                view.setBackgroundDrawable(rippleDrawable);
            }
        } else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                view.setBackground(null);
            } else {
                view.setBackgroundDrawable(null);
            }
        }
    }

    /**
     * 属性设置
     * @return
     */
    public int getTextActiveColor() {
        return mTextActiveColor;
    }

    public void setTextActiveColor(int textActiveColor) {
        mTextActiveColor = textActiveColor;
    }

    public int getTextInactiveColor() {
        return mTextInactiveColor;
    }

    public void setTextInactiveColor(int textInactiveColor) {
        mTextInactiveColor = textInactiveColor;
    }

    public int getFrontColor() {
        return mFrontColor;
    }

    public void setFrontColor(int frontColor) {
        mFrontColor = frontColor;
    }

    public int getBehindColor() {
        return mBehindColor;
    }

    public void setBehindColor(int behindColor) {
        mBehindColor = behindColor;
    }
}

其实也不会复杂,就是在切换Tab菜单时,对选中菜单设置背景为RippleDrawable,对之前的菜单背景设置为空,就这么简单^ ^,使用的话大体和FragmentHost是基本一样的,就添加Tab菜单使用上面实现的方法addTabItem(TabItem item, ClassfragClass, Bundle bundle)就行了,具体下载源代码查看。

 

这个TabHost实现还是不复杂,处理波纹效果外,源代码里还有一些其它动画效果,实现思路都一样,有兴趣也可以自己定制些更好看的动画效果~

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