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Android中实现类似探探中图片左右滑动切换效果
偶然之间发现探探的左右滑动的图片挺好玩，试着去做了下，再到后来，看到许多大神也推出了同样仿探探效果的博客，从头到尾阅读下来，写得通俗易懂，基本上没什么问题。于是，实现仿探探效果的想法再次出现在脑海中。那么，还犹豫什么，趁热来一发吧!就这么愉快地决定了。
RecyclerView 是最佳选择!
RecyclerView 是最佳选择!
RecyclerView 是最佳选择!
重要的话讲三遍!!!
究其原因，第一，RecyclerView 是自带 Item View 回收和重用功能的，就不需要我们考虑这个问题了;第二，RecyclerView 的布局方式是通过设置 LayoutManager 来实现的，这样就充分地把布局和 RecyclerView “解耦”开来了。而 LayoutManager 是可以通过自定义的方式来实现的。这恰恰是我们想要的!!!再说一点，这也正是不选用 ListView 的原因之一。
下面，我们就开始动手了。带你见证奇迹的时刻。
1.创建 CardLayoutManager 并继承自 RecyclerView.LayoutManager 。需要我们自己实现 generateDefaultLayoutParams() 方法：
@Overridepublic RecyclerView.LayoutParams generateDefaultLayoutParams() {
return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
} 2.一般情况下，像上面这样写即可。
下面这个方法就是我们的重点了。 onLayoutChildren(final RecyclerView.Recycler recycler, RecyclerView.State state) 方法就是用来实现 Item View 布局的：
@Overridepublic void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
super.onLayoutChildren(recycler, state);removeAllViews();detachAndScrapAttachedViews(recycler);
int itemCount = getItemCount();
if(itemCount>CardConfig.DEFAULT_SHOW_ITEM){
for(int position = CardConfig.DEFAULT_SHOW_ITEM;position>=0;position--){
final View view = recycler.getViewForPosition(position);addView(view);measureChildWithMargins(view,0,0);
int widthSpace = getWidth() -getDecoratedMeasuredWidth(view);
int heightSpace = getHeight() - getBottomDecorationHeight(view);layoutDecoratedWithMargins(view,widthSpace/2,heightSpace/2,widthSpace/2+getDecoratedMeasuredWidth(view),heightSpace/2+getBottomDecorationHeight(view));
if(position == CardConfig.DEFAULT_SHOW_ITEM){view.setScaleX(1-(position-1)*CardConfig.DEFAULT_SCALE);view.setScaleY(1-(position-1)*CardConfig.DEFAULT_SCALE);view.setTranslationY((position-1)*view.getMeasuredHeight()/CardConfig.DEFAULT_TRANSLATE_Y);}else if(position>0){view.setScaleX(1 - position * CardConfig.DEFAULT_SCALE);view.setScaleY(1 - position * CardConfig.DEFAULT_SCALE);view.setTranslationY(position * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);}else{view.setOnTouchListener(mOnTouchListener);}}}else{
// 当数据源个数小于或等于最大显示数时for (int position = itemCount - 1; position >= 0; position--) {
final View view = recycler.getViewForPosition(position);addView(view);measureChildWithMargins(view, 0, 0);
int widthSpace = getWidth() - getDecoratedMeasuredWidth(view);
int heightSpace = getHeight() - getDecoratedMeasuredHeight(view);
// recyclerview 布局layoutDecoratedWithMargins(view, widthSpace / 2, heightSpace / 2,widthSpace / 2 + getDecoratedMeasuredWidth(view),heightSpace / 2 + getDecoratedMeasuredHeight(view));
if (position > 0) {view.setScaleX(1 - position * CardConfig.DEFAULT_SCALE);view.setScaleY(1 - position * CardConfig.DEFAULT_SCALE);view.setTranslationY(position * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);} else {view.setOnTouchListener(mOnTouchListener);}}}}3.创建onTouchListener
private View.OnTouchListener mOnTouchListener = new View.OnTouchListener() {
@Overridepublic boolean onTouch(View v, MotionEvent event) {RecyclerView.ViewHolder childViewHolder = mRecyclerView.getChildViewHolder(v);
if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {mItemTouchHelper.startSwipe(childViewHolder);}
return false;}
};4.完整CardLayoutManager代码如下
public class CardLayoutManager extends RecyclerView.LayoutManager {
private RecyclerView mRecyclerView;
private ItemTouchHelper mItemTouchHelper;
public CardLayoutManager(@NonNull RecyclerView recyclerView, @NonNull ItemTouchHelper itemTouchHelper) {
this.mRecyclerView = recyclerView;
this.mItemTouchHelper = itemTouchHelper;}
@Overridepublic RecyclerView.LayoutParams generateDefaultLayoutParams() {
return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);}
@Overridepublic void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
super.onLayoutChildren(recycler, state);removeAllViews();detachAndScrapAttachedViews(recycler);
int itemCount = getItemCount();
if(itemCount>CardConfig.DEFAULT_SHOW_ITEM){
for(int position = CardConfig.DEFAULT_SHOW_ITEM;position>=0;position--){
final View view = recycler.getViewForPosition(position);addView(view);measureChildWithMargins(view,0,0);
int widthSpace = getWidth() -getDecoratedMeasuredWidth(view);
int heightSpace = getHeight() - getBottomDecorationHeight(view);layoutDecoratedWithMargins(view,widthSpace/2,heightSpace/2,widthSpace/2+getDecoratedMeasuredWidth(view),heightSpace/2+getBottomDecorationHeight(view));
if(position == CardConfig.DEFAULT_SHOW_ITEM){view.setScaleX(1-(position-1)*CardConfig.DEFAULT_SCALE);view.setScaleY(1-(position-1)*CardConfig.DEFAULT_SCALE);view.setTranslationY((position-1)*view.getMeasuredHeight()/CardConfig.DEFAULT_TRANSLATE_Y);}else if(position>0){view.setScaleX(1 - position * CardConfig.DEFAULT_SCALE);view.setScaleY(1 - position * CardConfig.DEFAULT_SCALE);view.setTranslationY(position * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);}else{view.setOnTouchListener(mOnTouchListener);}}}else{
// 当数据源个数小于或等于最大显示数时for (int position = itemCount - 1; position >= 0; position--) {
final View view = recycler.getViewForPosition(position);addView(view);measureChildWithMargins(view, 0, 0);
int widthSpace = getWidth() - getDecoratedMeasuredWidth(view);
int heightSpace = getHeight() - getDecoratedMeasuredHeight(view);
// recyclerview 布局layoutDecoratedWithMargins(view, widthSpace / 2, heightSpace / 2,widthSpace / 2 + getDecoratedMeasuredWidth(view),heightSpace / 2 + getDecoratedMeasuredHeight(view));
if (position > 0) {view.setScaleX(1 - position * CardConfig.DEFAULT_SCALE);view.setScaleY(1 - position * CardConfig.DEFAULT_SCALE);view.setTranslationY(position * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);} else {view.setOnTouchListener(mOnTouchListener);}}}}
private View.OnTouchListener mOnTouchListener = new View.OnTouchListener() {
@Overridepublic boolean onTouch(View v, MotionEvent event) {RecyclerView.ViewHolder childViewHolder = mRecyclerView.getChildViewHolder(v);
if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {mItemTouchHelper.startSwipe(childViewHolder);}
return false;}};
}
可以看出，大致的效果已经有了。缺少的就是处理触摸滑动事件了。
5.CardConfig
public class CardConfig {
/*** 显示可见的卡片数量*/public static final int DEFAULT_SHOW_ITEM = 3;
/*** 默认缩放的比例*/public static final float DEFAULT_SCALE = 0.1f;
/*** 卡片Y轴偏移量时按照14等分计算*/public static final int DEFAULT_TRANSLATE_Y = 14;
/*** 卡片滑动时默认倾斜的角度*/public static final float DEFAULT_ROTATE_DEGREE = 15f;
/*** 卡片滑动时不偏左也不偏右*/public static final int SWIPING_NONE = 1;
/*** 卡片向左滑动时*/public static final int SWIPING_LEFT = 1 << 2;
/*** 卡片向右滑动时*/public static final int SWIPING_RIGHT = 1 << 3;
/*** 卡片从左边滑出*/public static final int SWIPED_LEFT = 1;
/*** 卡片从右边滑出*/public static final int SWIPED_RIGHT = 1 << 2;} 6.OnSwipeListener
在看滑动事件的代码之前，我们先定义一个监听器。主要用于监听卡片滑动事件，代码就如下所示，注释也给出来了。应该都看得懂吧：
public interface OnSwipeListener<T> {
/*** 卡片还在滑动时回调** @param viewHolder 该滑动卡片的viewHolder* @param ratio 滑动进度的比例* @param direction 卡片滑动的方向，CardConfig.SWIPING_LEFT 为向左滑，CardConfig.SWIPING_RIGHT 为向右滑，* CardConfig.SWIPING_NONE 为不偏左也不偏右*/void onSwiping(RecyclerView.ViewHolder viewHolder, float ratio, int direction);
/*** 卡片完全滑出时回调** @param viewHolder 该滑出卡片的viewHolder* @param t 该滑出卡片的数据* @param direction 卡片滑出的方向，CardConfig.SWIPED_LEFT 为左边滑出；CardConfig.SWIPED_RIGHT 为右边滑出*/void onSwiped(RecyclerView.ViewHolder viewHolder, T t, int direction);
/*** 所有的卡片全部滑出时回调*/void onSwipedClear();
}7.CardItemTouchHelperCallback
现在，我们可以回过头来看看卡片滑动了。对于 ItemTouchHelper 来处理 Item View 的触摸滑动事件相必都不陌生吧!
我们暂且命名为 CardItemTouchHelperCallback 。对于 ItemTouchHelper.Callback 而言，需要在 getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) 方法中配置 swipeFlags 和 dragFlags 。
public class CardItemTouchHelperCallback<T> extends ItemTouchHelper.Callback {
private final RecyclerView.Adapter adapter;
private List<T> dataList;
private OnSwipeListener<T> mListener;
public CardItemTouchHelperCallback(@NonNull RecyclerView.Adapter adapter, @NonNull List<T> dataList) {
this.adapter = adapter;
this.dataList = dataList;}
public CardItemTouchHelperCallback(@NonNull RecyclerView.Adapter adapter, @NonNull List<T> dataList, OnSwipeListener<T> listener) {
this.adapter = adapter;
this.dataList = dataList;
this.mListener = listener;}
@Overridepublic int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int dragFlags = 0;
int swipeFlags = 0;RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if (layoutManager instanceof CardLayoutManager) {swipeFlags = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;}
return makeMovementFlags(dragFlags, swipeFlags);}
@Overridepublic boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;}
@Overridepublic void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
// 移除之前设置的 onTouchListener, 否则触摸滑动会乱了viewHolder.itemView.setOnTouchListener(null);
// 删除相对应的数据int layoutPosition = viewHolder.getLayoutPosition();T remove = dataList.remove(layoutPosition);adapter.notifyDataSetChanged();
// 卡片滑出后回调 OnSwipeListener 监听器if (mListener != null) {mListener.onSwiped(viewHolder, remove, direction == ItemTouchHelper.LEFT ? CardConfig.SWIPED_LEFT : CardConfig.SWIPED_RIGHT);}
// 当没有数据时回调 OnSwipeListener 监听器if (adapter.getItemCount() == 0) {
if (mListener != null) {mListener.onSwipedClear();}}}
public void setOnSwipedListener(OnSwipeListener<T> mListener) {
this.mListener = mListener;}
@Overridepublic boolean isItemViewSwipeEnabled() {
return false;}
@Overridepublic void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
float dX, float dY, int actionState, boolean isCurrentlyActive) {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);View itemView = viewHolder.itemView;
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
// 得到滑动的阀值 float ratio = dX / getThreshold(recyclerView, viewHolder);
// ratio 最大为 1 或 -1if (ratio > 1) {ratio = 1;} else if (ratio < -1) {ratio = -1;}
// 默认最大的旋转角度为 15 度itemView.setRotation(ratio * CardConfig.DEFAULT_ROTATE_DEGREE);
int childCount = recyclerView.getChildCount();
// 当数据源个数大于最大显示数时if (childCount > CardConfig.DEFAULT_SHOW_ITEM) {
for (int position = 1; position < childCount - 1; position++) {
int index = childCount - position - 1;View view = recyclerView.getChildAt(position);
// 和之前 onLayoutChildren 是一个意思，不过是做相反的动画view.setScaleX(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);view.setScaleY(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);view.setTranslationY((index - Math.abs(ratio)) * itemView.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);}} else {
// 当数据源个数小于或等于最大显示数时for (int position = 0; position < childCount - 1; position++) {
int index = childCount - position - 1;View view = recyclerView.getChildAt(position);view.setScaleX(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);view.setScaleY(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);view.setTranslationY((index - Math.abs(ratio)) * itemView.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);}}
// 回调监听器if (mListener != null) {
if (ratio != 0) {mListener.onSwiping(viewHolder, ratio, ratio < 0 ? CardConfig.SWIPING_LEFT : CardConfig.SWIPING_RIGHT);} else {mListener.onSwiping(viewHolder, ratio, CardConfig.SWIPING_NONE);}}}}
private float getThreshold(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
return recyclerView.getWidth() * getSwipeThreshold(viewHolder);}
@Overridepublic void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);viewHolder.itemView.setRotation(0f);}
}8.在Activity中引用
public class MainActivity extends AppCompatActivity {
private List<Integer> list = new ArrayList<>();
@Overrideprotected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();}
private void initView() {
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);recyclerView.setItemAnimator(new DefaultItemAnimator());recyclerView.setAdapter(new MyAdapter());CardItemTouchHelperCallback cardCallback = new CardItemTouchHelperCallback(recyclerView.getAdapter(), list);cardCallback.setOnSwipedListener(new OnSwipeListener<Integer>() {
@Overridepublic void onSwiping(RecyclerView.ViewHolder viewHolder, float ratio, int direction) {MyAdapter.MyViewHolder myHolder = (MyAdapter.MyViewHolder) viewHolder;viewHolder.itemView.setAlpha(1 - Math.abs(ratio) * 0.2f);
if (direction == CardConfig.SWIPING_LEFT) {myHolder.dislikeImageView.setAlpha(Math.abs(ratio));} else if (direction == CardConfig.SWIPING_RIGHT) {myHolder.likeImageView.setAlpha(Math.abs(ratio));} else {myHolder.dislikeImageView.setAlpha(0f);myHolder.likeImageView.setAlpha(0f);}}
@Overridepublic void onSwiped(RecyclerView.ViewHolder viewHolder, Integer o, int direction) {MyAdapter.MyViewHolder myHolder = (MyAdapter.MyViewHolder) viewHolder;viewHolder.itemView.setAlpha(1f);myHolder.dislikeImageView.setAlpha(0f);myHolder.likeImageView.setAlpha(0f);Toast.makeText(MainActivity.this, direction == CardConfig.SWIPED_LEFT ? "swiped left" : "swiped right", Toast.LENGTH_SHORT).show();}
@Overridepublic void onSwipedClear() {Toast.makeText(MainActivity.this, "data clear", Toast.LENGTH_SHORT).show();recyclerView.postDelayed(new Runnable() {
@Overridepublic void run() {initData();recyclerView.getAdapter().notifyDataSetChanged();}}, 3000L);}});
final ItemTouchHelper touchHelper = new ItemTouchHelper(cardCallback);
final CardLayoutManager cardLayoutManager = new CardLayoutManager(recyclerView, touchHelper);recyclerView.setLayoutManager(cardLayoutManager);touchHelper.attachToRecyclerView(recyclerView);}
private void initData() {list.add(R.drawable.img_avatar_01);list.add(R.drawable.img_avatar_02);list.add(R.drawable.img_avatar_03);list.add(R.drawable.img_avatar_04);list.add(R.drawable.img_avatar_05);list.add(R.drawable.img_avatar_06);list.add(R.drawable.img_avatar_07);}
private class MyAdapter extends RecyclerView.Adapter {
@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
return new MyViewHolder(view);}
@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {ImageView avatarImageView = ((MyViewHolder) holder).avatarImageView;avatarImageView.setImageResource(list.get(position));}
@Overridepublic int getItemCount() {
return list.size();}
class MyViewHolder extends RecyclerView.ViewHolder {ImageView avatarImageView;ImageView likeImageView;ImageView dislikeImageView;MyViewHolder(View itemView) {
super(itemView);avatarImageView = (ImageView) itemView.findViewById(R.id.iv_avatar);likeImageView = (ImageView) itemView.findViewById(R.id.iv_like);dislikeImageView = (ImageView) itemView.findViewById(R.id.iv_dislike);}}}9.MainActiviy布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><android.support.v7.widget.RecyclerViewandroid:id="@+id/recyclerView"android:layout_width="match_parent"android:layout_height="match_parent" />
</LinearLayout>
10.item布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""xmlns:app=""android:layout_width="336dp"android:layout_height="426dp"android:background="@drawable/img_card_background"android:gravity="center"android:orientation="vertical"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"><com.example.admin.tantanuse.RoundImageViewandroid:id="@+id/iv_avatar"android:layout_width="match_parent"android:layout_height="match_parent"android:scaleType="centerCrop"app:radius="7.5dp"android:src="@drawable/img_avatar_01" /><ImageViewandroid:id="@+id/iv_dislike"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:layout_marginRight="15dp"android:layout_marginTop="15dp"android:alpha="0"android:src="@drawable/img_dislike" /><ImageViewandroid:id="@+id/iv_like"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="15dp"android:layout_marginTop="15dp"android:alpha="0"android:src="@drawable/img_like" /></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="100dp"android:paddingLeft="14dp"android:paddingTop="15dp"><TextViewandroid:id="@+id/tv_name"android:layout_width="wrap_content"android:layout_height="wrap_content"android:gravity="center"android:text="小姐姐"android:textColor="@android:color/black"android:textSize="16sp" /><TextViewandroid:id="@+id/tv_age"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/tv_name"android:layout_marginTop="5dp"android:background="@drawable/shape_age"android:gravity="center"android:text="♀ 23"android:textColor="#FFFFFF"android:textSize="14sp" /><TextViewandroid:id="@+id/tv_constellation"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/tv_name"android:layout_marginLeft="4dp"android:layout_marginTop="5dp"android:layout_toRightOf="@id/tv_age"android:background="@drawable/shape_constellation"android:gravity="center"android:text="狮子座"android:textColor="#FFFFFF"android:textSize="14sp" /><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/tv_age"android:layout_marginTop="5dp"android:gravity="center"android:text="IT/互联网"android:textColor="#cbcbcb" /></RelativeLayout>
</LinearLayout>11.带圆角的ImagView
public class RoundImageView extends ImageView {
private Path mPath;
private RectF mRectF;
private float[] rids = new float[8];
private PaintFlagsDrawFilter paintFlagsDrawFilter;
public RoundImageView(Context context) {
this(context, null);}
public RoundImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);}
public RoundImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
float mRadius = array.getDimension(R.styleable.RoundImageView_radius, 10);rids[0] = mRadius;rids[1] = mRadius;rids[2] = mRadius;rids[3] = mRadius;rids[4] = 0f;rids[5] = 0f;rids[6] = 0f;rids[7] = 0f;array.recycle();mPath = new Path();paintFlagsDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);setLayerType(View.LAYER_TYPE_HARDWARE, null);}
@Overrideprotected void onDraw(Canvas canvas) {mPath.reset();mPath.addRoundRect(mRectF, rids, Path.Direction.CW);canvas.setDrawFilter(paintFlagsDrawFilter);canvas.save();canvas.clipPath(mPath);
super.onDraw(canvas);canvas.restore();}
@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);mRectF = new RectF(0, 0, w, h);}
}12.attrs.XML
<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="RoundImageView"><attr name="radius" format="reference|dimension" /></declare-styleable>
</resources>本文标签： Android中实现类似探探中图片左右滑动切换效果
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