仿探探的卡片滑動效果-recyclerView實現
阿新 • • 發佈：2019-01-22
這裡是一個通過自定義view和自定義RecyclerView的:layoutManager，再結合ItemTouchHelper實現的一個仿探探的卡片滑動的效果:
效果圖已經奉上，接下來是程式碼:
首先是每張圖片的佈局:item
activity_main:<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="336dp" android:layout_height="426dp" android:background="@drawable/img_card_background" android:gravity="center" android:orientation="vertical"> <RelativeLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <com.bwie.w.test1121.cardswipelayout.RoundImageView android:id="@+id/iv_avatar" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop" android:src="@drawable/img_avatar_01" app:radius="7.5dp" /> <ImageView android: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" /> <ImageView android: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> <RelativeLayout android:layout_width="match_parent" android:layout_height="100dp" android:paddingLeft="14dp" android:paddingTop="15dp"> <TextView android: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" /> <TextView android: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" /> <TextView android: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="獅子座" android:textColor="#FFFFFF" android:textSize="14sp" /> <TextView android: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/網際網路" android:textColor="#cbcbcb" /> </RelativeLayout> </LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />一個常量引數類:CardConfig
拖動item的回撥類:CardItemTouchHelperCallBack/** * 常量引數 */ public final class CardConfig { /** * 顯示可見的卡片數量 */ public static final int DEFAULT_SHOW_ITEM = 3; /** * 預設縮放的比例 */ public static final float DEFAULT_SCALE = 0.1f; /** * 卡片Y軸偏移量時按照14等分計算 */ public static final int DEFAULT_TRANSLATE_Y = 14; /** * 卡片滑動時預設傾斜的角度 */ public static final float DEFAULT_ROTATE_DEGREE = 15f; /** * 卡片滑動時不偏左也不偏右 */ public static final int SWIPING_NONE = 1; /** * 卡片向左滑動時 */ public static final int SWIPING_LEFT = 1 << 2; /** * 卡片向右滑動時 */ public static final int SWIPING_RIGHT = 1 << 3; /** * 卡片從左邊滑出 */ public static final int SWIPED_LEFT = 1; /** * 卡片從右邊滑出 */ public static final int SWIPED_RIGHT = 1 << 2; }
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 = checkIsNull(adapter); this.dataList = checkIsNull(dataList); } public CardItemTouchHelperCallback(@NonNull RecyclerView.Adapter adapter, @NonNull List<T> dataList, OnSwipeListener<T> listener) { this.adapter = checkIsNull(adapter); this.dataList = checkIsNull(dataList); this.mListener = listener; } private <T> T checkIsNull(T t) { if (t == null) { throw new NullPointerException(); } return t; } public void setOnSwipedListener(OnSwipeListener<T> mListener) { this.mListener = mListener; } /** * 設定滑動型別標記 * * @param recyclerView * @param viewHolder * @return * 返回一個整數型別的標識，用於判斷Item那種移動行為是允許的 */ @Override public 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); } /** * 拖拽切換Item的回撥 * * @param recyclerView * @param viewHolder * @param target * @return * 如果Item切換了位置，返回true；反之，返回false */ @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { return false; } /** * * 劃出時會執行 * @param viewHolder * @param direction:左側劃出為:4,右側劃出為:8 */ @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { Log.d("mylog", "onSwiped: " + direction); // 移除 onTouchListener,否則觸控滑動會亂了 viewHolder.itemView.setOnTouchListener(null); int layoutPosition = viewHolder.getLayoutPosition(); T remove = dataList.remove(layoutPosition); adapter.notifyDataSetChanged(); if (mListener != null) { mListener.onSwiped(viewHolder, remove, direction == ItemTouchHelper.LEFT ? CardConfig.SWIPED_LEFT : CardConfig.SWIPED_RIGHT); } // 當沒有資料時回撥 mListener if (adapter.getItemCount() == 0) { if (mListener != null) { mListener.onSwipedClear(); } } } /** * Item是否支援滑動 * * @return * true 支援滑動操作 * false 不支援滑動操作 */ @Override public boolean isItemViewSwipeEnabled() { return false; } /** * 拖動時會執行的方法 * @param c * @param recyclerView * @param viewHolder * @param dX * @param dY * @param actionState * @param isCurrentlyActive */ @Override public 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); // Log.d("mylog", "onChildDraw: 拖動"); View itemView = viewHolder.itemView; if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) { float ratio = dX / getThreshold(recyclerView, viewHolder); // ratio 最大為 1 或 -1 if (ratio > 1) { ratio = 1; } else if (ratio < -1) { ratio = -1; } Log.d("mylog", "onChildDraw: " + ratio); itemView.setRotation(ratio * CardConfig.DEFAULT_ROTATE_DEGREE); int childCount = recyclerView.getChildCount(); // 當資料來源個數大於最大顯示數時 if (childCount > CardConfig.DEFAULT_SHOW_ITEM) { for (int position = 1; 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.setScaleX(1 - index * CardConfig.DEFAULT_SCALE ); view.setScaleY(1 - index * CardConfig.DEFAULT_SCALE);*/ view.setTranslationY((index - Math.abs(ratio)) * itemView.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y); } } else { // 當資料來源個數小於或等於最大顯示數時 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); } } if (mListener != null) { if (ratio != 0) { // Log.d("mylog", "onChildDraw: 不為零"); mListener.onSwiping(viewHolder, ratio, ratio < 0 ? CardConfig.SWIPING_LEFT : CardConfig.SWIPING_RIGHT); } else { // Log.d("mylog", "onChildDraw: 為零"); mListener.onSwiping(viewHolder, ratio, CardConfig.SWIPING_NONE); } } } } @Override public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { super.clearView(recyclerView, viewHolder); viewHolder.itemView.setRotation(0f); } private float getThreshold(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { return recyclerView.getWidth() * getSwipeThreshold(viewHolder); } }
自定義佈局管理器:CardLayoutManager:
/**
* 自定義佈局管理器
*/
public class CardLayoutManager extends RecyclerView.LayoutManager {
private RecyclerView mRecyclerView;
private ItemTouchHelper mItemTouchHelper;
public CardLayoutManager(@NonNull RecyclerView recyclerView, @NonNull ItemTouchHelper itemTouchHelper) {
this.mRecyclerView = checkIsNull(recyclerView);
this.mItemTouchHelper = checkIsNull(itemTouchHelper);
}
private <T> T checkIsNull(T t) {
if (t == null) {
throw new NullPointerException();
}
return t;
}
@Override
public RecyclerView.LayoutParams generateDefaultLayoutParams() {
return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
}
@Override
public void onLayoutChildren(final RecyclerView.Recycler recycler, RecyclerView.State state) {
detachAndScrapAttachedViews(recycler);
int itemCount = getItemCount();
// 當資料來源個數大於最大顯示數時
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() - getDecoratedMeasuredHeight(view);
// recyclerview 佈局
layoutDecoratedWithMargins(view, widthSpace / 2, heightSpace / 2,
widthSpace / 2 + getDecoratedMeasuredWidth(view),
heightSpace / 2 + getDecoratedMeasuredHeight(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 {
// 當資料來源個數小於或等於最大顯示數時
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 佈局
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() {
@Override
public boolean onTouch(View v, MotionEvent event) {
RecyclerView.ViewHolder childViewHolder = mRecyclerView.getChildViewHolder(v);
if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {
mItemTouchHelper.startSwipe(childViewHolder);
}
return false;
}
};
}
狀態回撥介面:OnSwipeListener
/**
* @author 狀態回撥介面
*/
public interface OnSwipeListener<T> {
/**
* 卡片還在滑動時回撥
*
* @param viewHolder 該滑動卡片的viewHolder
* @param ratio 滑動進度的比例
* @param direction 卡片滑動的方向，CardConfig.SWIPING_LEFT 為向左滑，CardConfig.SWIPING_RIGHT 為向右滑，
* CardConfig.SWIPING_NONE 為不偏左也不偏右
*/
void onSwiping(RecyclerView.ViewHolder viewHolder, float ratio, int direction);
/**
* 卡片完全滑出時回撥
*
* @param viewHolder 該滑出卡片的viewHolder
* @param t 該滑出卡片的資料
* @param direction 卡片滑出的方向，CardConfig.SWIPED_LEFT 為左邊滑出；CardConfig.SWIPED_RIGHT 為右邊滑出
*/
void onSwiped(RecyclerView.ViewHolder viewHolder, T t, int direction);
/**
* 所有的卡片全部滑出時回撥
*/
void onSwipedClear();
}
自定義條目圖片樣式:RoundImageView:
/**
* 自定義圖片樣式，頂部圓角顯示
*/
public class RoundImageView extends ImageView {
private Path mPath;
private RectF mRectF;
/*圓角的半徑，依次為左上角xy半徑，右上角，右下角，左下角*/
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();
//用於繪製的類
mPath = new Path();
//抗鋸齒
paintFlagsDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
//關閉硬體加速，同時其他地方依然享受硬體加速
setLayerType(View.LAYER_TYPE_HARDWARE, null);
}
@Override
protected void onDraw(Canvas canvas) {
// Log.d("mylog", "onDraw: ");
//重置path
mPath.reset();
//p1:大小，p2:圓角，p3:CW:順時針繪製path，CCW:逆時針
mPath.addRoundRect(mRectF, rids, Path.Direction.CW);
//新增抗鋸齒
canvas.setDrawFilter(paintFlagsDrawFilter);
canvas.save();
//該方法不支援硬體加速，如果開啟會導致效果出不來，所以之前設定關閉硬體加速
//Clip(剪下)的時機：通常理解的clip(剪下)，是對已經存在的圖形進行clip的。
// 但是，在android上是對canvas（畫布）上進行clip的，要在畫圖之前對canvas進行clip，
// 如果畫圖之後再對canvas進行clip不會影響到已經畫好的圖形。一定要記住clip是針對canvas而非圖形
//開始根據path裁剪
canvas.clipPath(mPath);
super.onDraw(canvas);
canvas.restore();
}
int a,b;
//執行在onDraw()之前
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// Log.d("mylog", "onSizeChanged: ");
a = w;
b = h;
mRectF = new RectF(0, 0, w, h);
Log.d("mylog", "onSizeChanged: "+w+"-----"+h);
}
}
MainActivity:
public class MainActivity extends AppCompatActivity {
private List<Integer> list = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initView() {
final 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>() {
@Override
public 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);
}
}
@Override
public 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();
}
@Override
public void onSwipedClear() {
Toast.makeText(MainActivity.this, "data clear", Toast.LENGTH_SHORT).show();
recyclerView.postDelayed(new Runnable() {
@Override
public 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 {
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
ImageView avatarImageView = ((MyViewHolder) holder).avatarImageView;
avatarImageView.setImageResource(list.get(position));
}
@Override
public 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);
}
}
}
}
attrs:
<resources>
<declare-styleable name="RoundImageView">
<attr name="radius" format="reference|dimension" />
</declare-styleable>
</resources>