add position changed listener

Author: bruce3x

cardstackview/src/main/java/me/brucezz/cardstackview/CardFactory.java

@@ -5,6 +5,7 @@
 import android.view.ViewGroup;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 
 /**
  * Created by brucezz on 2016-10-12.
@@ -85,4 +86,13 @@ public void swapRealIndex(int one, int another) {
         mCardHolders.get(one).mRealIndex = one;
         mCardHolders.get(another).mRealIndex = another;
     }
+
+    public List<Integer> getAllPosition() {
+        List<Integer> all = new ArrayList<>();
+        for (CardHolder holder : mCardHolders) {
+            all.add(holder.mChildIndex);
+        }
+
+        return all;
+    }
 }

cardstackview/src/main/java/me/brucezz/cardstackview/CardStackView.java

@@ -11,6 +11,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.OvershootInterpolator;
+import java.util.List;
 
 /**
  * Created by brucezz on 2016-10-08.
@@ -30,7 +31,8 @@ public class CardStackView extends ViewGroup {
 
     private ViewDragHelper mViewDragHelper;
     private GestureDetectorCompat mGestureDetector;
-    private onCardClickListener mOnCardClickListener;
+    private OnCardClickListener mOnCardClickListener;
+    private OnPositionChangedListener mOnPositionChangedListener;
     /**
      * 阻力滑动计算
      */
@@ -126,6 +128,9 @@ public void onViewPositionChanged(View changedView, int left, int top, int dx, i
                     mCardFactory.findByRealIndex(holder.mRealIndex + directionFlag).onSwap(holder);
 
                     mCardFactory.swapRealIndex(holder.mRealIndex, holder.mRealIndex + directionFlag);
+                    if (mOnPositionChangedListener != null) {
+                        mOnPositionChangedListener.onPositionChanged(mCardFactory.getAllPosition());
+                    }
                 }
             }
         };
@@ -284,10 +289,14 @@ public void setAdapter(CardAdapter adapter) {
         }
     }
 
-    public void setOnCardClickListener(onCardClickListener listener) {
+    public void setOnCardClickListener(OnCardClickListener listener) {
         this.mOnCardClickListener = listener;
     }
 
+    public void setOnPositionChangedListener(OnPositionChangedListener onPositionChangedListener) {
+        mOnPositionChangedListener = onPositionChangedListener;
+    }
+
     /**
      * 重置卡片间距
      */
@@ -305,7 +314,7 @@ public void onAnimationUpdate(ValueAnimator animation) {
         spanResetAnimator.start();
     }
 
-    public interface onCardClickListener {
+    public interface OnCardClickListener {
 
         /**
          * @param view         被点击的 View
@@ -315,6 +324,13 @@ public interface onCardClickListener {
         void onClick(View view, int realIndex, int initialIndex);
     }
 
+    public interface OnPositionChangedListener {
+        void onPositionChanged(List<Integer> position);
+    }
+
+
+
+
     private class CardStackViewDataObserver extends DataSetObserver {
         @Override
         public void onChanged() {

sample/src/main/java/me/brucezz/sample/MainActivity.java

@@ -1,7 +1,10 @@
 package me.brucezz.sample;
 
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
 import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -16,19 +19,44 @@ public class MainActivity extends AppCompatActivity {
     SimpleCardAdapter mCardAdapter;
     private List<Card> mCards;
 
+    private Handler mHandler = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            super.handleMessage(msg);
+            modifyData();
+            mHandler.sendEmptyMessageDelayed(0, 2000);
+        }
+    };
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        mHandler.removeMessages(0);
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         mCardStackView = (CardStackView) findViewById(R.id.card_stack_view);
-        mCardStackView.setOnCardClickListener(new CardStackView.onCardClickListener() {
+        mCardStackView.setOnCardClickListener(new CardStackView.OnCardClickListener() {
             @Override
             public void onClick(View view, int realIndex, int initialIndex) {
                 Toast.makeText(MainActivity.this, "点击了第" + realIndex + "个卡片 => " + mCards.get(initialIndex).mTitle,
                     Toast.LENGTH_SHORT).show();
             }
         });
+        mCardStackView.setOnPositionChangedListener(new CardStackView.OnPositionChangedListener() {
+            @Override
+            public void onPositionChanged(List<Integer> position) {
+                StringBuilder sb = new StringBuilder();
+                for (Integer integer : position) {
+                    sb.append(integer).append(" ");
+                }
+                Log.d("TAG", "onPositionChanged: " + sb.toString());
+            }
+        });
 
         mCards = fakeCards();
         mCardAdapter = new SimpleCardAdapter(this, mCards);
@@ -44,7 +72,7 @@ private List<Card> fakeCards() {
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
-        menu.add(1, 1, 1, "修改数据");
+        menu.add(1, 1, 1, "定时2s修改数据");
         menu.add(1, 2, 1, "重置");
         return super.onCreateOptionsMenu(menu);
     }
@@ -53,15 +81,19 @@ public boolean onCreateOptionsMenu(Menu menu) {
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case 1:
-                for (Card card : mCards) {
-                    card.mTitle += "X";
-                }
-                mCardAdapter.notifyDataSetChanged();
+                mHandler.sendEmptyMessageDelayed(0, 2000);
                 break;
             case 2:
                 recreate();
                 break;
         }
         return super.onOptionsItemSelected(item);
     }
+
+    private void modifyData() {
+        for (int i = 0; i < mCards.size(); i++) {
+            mCards.get(i).mTitle += String.valueOf(i);
+        }
+        mCardAdapter.notifyDataSetChanged();
+    }
 }