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Android开发首页底部tab切换图标有动画效果

主页tab切换很正常，但往往加上写动画更好看

一、思路：

用属性动画，并且事先准备多张图片，用于切换后播放动画

二、效果图：

单纯图看不出来，看下视频效果

三、关键代码：

public class TabButtonGroup extends LinearLayout implements View.OnClickListener {private TabButton[] mTabButtons;private ViewPager mViewPager;private int mCurPosition;public TabButtonGroup(Context context) {this(context, null);}public TabButtonGroup(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public TabButtonGroup(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onFinishInflate() {super.onFinishInflate();int childCount = getChildCount();if (childCount > 0) {mTabButtons = new TabButton[childCount];for (int i = 0; i < childCount; i++) {View v = getChildAt(i);v.setTag(i);v.setOnClickListener(this);mTabButtons[i] = (TabButton) v;}}}public void setCurPosition(int position) {if (position == mCurPosition) {return;}if (mClickIntercepter != null && mClickIntercepter.needIntercept(position)) {return;}mTabButtons[mCurPosition].setChecked(false);mTabButtons[position].setChecked(true);mCurPosition = position;if (mViewPager != null) {mViewPager.setCurrentItem(position, false);}}@Overridepublic void onClick(View v) {Object tag = v.getTag();if (tag != null) {setCurPosition((int) tag);}}public void setViewPager(ViewPager viewPager) {mViewPager = viewPager;}public void cancelAnim() {if (mTabButtons != null) {for (TabButton tbn : mTabButtons) {if (tbn != null) {tbn.cancelAnim();}}}}public ClickIntercepter mClickIntercepter;public void setClickIntercepter(ClickIntercepter intercepter) {mClickIntercepter = intercepter;}public interface ClickIntercepter {boolean needIntercept(int position);}public void btnPerformClick(int position){if (mTabButtons != null&&mTabButtons[position]!=null) {mTabButtons[position].performClick();}}
}

public class TabButton extends LinearLayout {private Context mContext;private float mScale;private String mTip;private int mIconSize;private int mTextSize;private int mTextColorChecked;private int mTextColorUnChecked;private boolean mChecked;private ImageView mImg;private TextView mText;private Drawable[] mDrawables;private int mDrawaleArrayLength;private ValueAnimator mAnimator;private int mDrawableIndex;public TabButton(Context context) {this(context, null);}public TabButton(Context context, AttributeSet attrs) {this(context, attrs, 0);}public TabButton(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);mContext = context;mScale = context.getResources().getDisplayMetrics().density;TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TabButton);int iconArrayId = ta.getResourceId(R.styleable.TabButton_tbn_icon_array_id, 0);mTip = ta.getString(R.styleable.TabButton_tbn_tip);mIconSize = (int) ta.getDimension(R.styleable.TabButton_tbn_icon_size, 0);mTextSize = (int) ta.getDimension(R.styleable.TabButton_tbn_text_size, 0);mTextColorChecked = ta.getColor(R.styleable.TabButton_tbn_text_color_checked, 0);mTextColorUnChecked = ta.getColor(R.styleable.TabButton_tbn_text_color_unchecked, 0);mChecked = ta.getBoolean(R.styleable.TabButton_tbn_checked, false);ta.recycle();if (iconArrayId != 0) {TypedArray arr = getResources().obtainTypedArray(iconArrayId);int len = arr.length();int[] iconResArray = new int[len];for (int i = 0; i < len; i++) {iconResArray[i] = arr.getResourceId(i, 0);}arr.recycle();mDrawaleArrayLength = iconResArray.length;if (mDrawaleArrayLength > 0) {mDrawables = new Drawable[mDrawaleArrayLength];for (int i = 0; i < mDrawaleArrayLength; i++) {mDrawables[i] = ContextCompat.getDrawable(context, iconResArray[i]);}}}mAnimator = ValueAnimator.ofFloat(1, mDrawaleArrayLength - 1);mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {float v = (float) animation.getAnimatedValue();int index = (int) v;if (mDrawableIndex != index) {mDrawableIndex = index;if (mImg != null) {mImg.setImageDrawable(mDrawables[index]);}}}});mAnimator.setDuration(500);mAnimator.setInterpolator(new LinearInterpolator());}@Overrideprotected void onFinishInflate() {super.onFinishInflate();setOrientation(VERTICAL);setGravity(Gravity.CENTER_HORIZONTAL);mImg = new ImageView(mContext);LayoutParams params1 = new LayoutParams(mIconSize, mIconSize);params1.setMargins(0, dp2px(4), 0, 0);mImg.setLayoutParams(params1);if (mDrawables != null && mDrawaleArrayLength > 0) {if (mChecked) {mImg.setImageDrawable(mDrawables[mDrawaleArrayLength - 1]);} else {mImg.setImageDrawable(mDrawables[0]);}}mText = new TextView(mContext);LayoutParams params2 = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);mText.setLayoutParams(params2);mText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);mText.setText(mTip);mText.setTextColor(mChecked ? mTextColorChecked : mTextColorUnChecked);addView(mImg);addView(mText);}public void setChecked(boolean checked) {mChecked = checked;if (mDrawables != null && mDrawaleArrayLength > 0) {if (mChecked) {if (mText != null) {mText.setTextColor(mTextColorChecked);}if (mAnimator != null) {mAnimator.start();}} else {if (mAnimator != null) {mAnimator.cancel();}if (mImg != null) {mImg.setImageDrawable(mDrawables[0]);}if (mText != null) {mText.setTextColor(mTextColorUnChecked);}}}}private int dp2px(int dpVal) {return (int) (mScale * dpVal + 0.5f);}public void cancelAnim() {if (mAnimator != null) {mAnimator.cancel();mAnimator.removeAllUpdateListeners();}}}

四、项目demo源码结构图：

有问题或者需要完整源码的私信我