質問編集履歴

クラス名の追加

2016/05/22 09:27

投稿

ken0625

スコア40

test CHANGED Viewed

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test CHANGED Viewed

@@ -174,6 +174,8 @@
 ```ここに言語を入力
+public abstract class ArrayFragmentStatePagerAdapter<T> extends ArrayPagerAdapter<T> {
  private static final String TAG = "StatePagerAdapter";
     private static final boolean DEBUG = false;
@@ -270,6 +272,10 @@
     }
+}
 ```
@@ -278,6 +284,8 @@
 ```ここに言語を入力
+public abstract class ArrayPagerAdapter<T> extends PagerAdapter {
  @Override
     public Object instantiateItem(ViewGroup container, int position) {
@@ -324,6 +332,8 @@
      */
+}
 ```

ソースの追加

2016/05/22 09:26

投稿

ken0625

スコア40

test CHANGED Viewed

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test CHANGED Viewed

@@ -271,3 +271,151 @@
     }
 ```
+これが上のスーパーメソッドです
+```ここに言語を入力
+ @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        return items.get(position);
+    }
+    /**
+     * Adds the specified item at the end of the array.
+     *
+     * @param item The item to add at the end of the array.
+     */
+    public void add(T item) {
+        synchronized (lock) {
+            items.add(identifiedItemFactory.create(item));
+        }
+        itemPositionChangeChecked = new SparseBooleanArray(this.items.size());
+        notifyDataSetChanged();
+    }
+    /**
+     * Adds the specified items at the end of the array.
+     *
+     * @param items The items to add at the end of the array.
+     */
+```
+うえで使われているクラスです
+```ここに言語を入力
+    static class IdentifiedItemFactory<T> {
+        private long lastId;
+        IdentifiedItemFactory(long firstId) {
+            lastId = firstId;
+        }
+        IdentifiedItem<T> create(T item) {
+            return new IdentifiedItem(lastId++, item);
+        }
+        ArrayList<IdentifiedItem<T>> createList(List<T> items) {
+            ArrayList<IdentifiedItem<T>> list = new ArrayList();
+            for (T item : items) {
+                list.add(create(item));
+            }
+            return list;
+        }
+        @SafeVarargs
+        final ArrayList createList(T... items) {
+            return createList(new ArrayList<>(Arrays.asList(items)));
+        }
+    }
+    static class IdentifiedItem<T> {
+        long id;
+        T item;
+        public IdentifiedItem(long id, T item) {
+            this.id = id;
+            this.item = item;
+        }
+        @Override
+        public String toString() {
+            return "IdentifiedItem{" +
+                    "id=" + id +
+                    ", item=" + item +
+                    '}';
+        }
+    }
+```

ソースコードの追加

2016/05/22 08:27

投稿

ken0625

スコア40

test CHANGED Viewed

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@@ -169,3 +169,105 @@
 ```
+adapterが継承してるメソッドです
+```ここに言語を入力
+ private static final String TAG = "StatePagerAdapter";
+    private static final boolean DEBUG = false;
+    private final FragmentManager mFragmentManager;
+    private FragmentTransaction mCurTransaction = null;
+    private ItemsStateHandler mItemsStateHandler;
+    private ArrayList<Fragment.SavedState> mSavedState = new ArrayList<>();
+    private ArrayList<Fragment> mFragments = new ArrayList<>();
+    private Fragment mCurrentPrimaryItem = null;
+ @SuppressLint("CommitTransaction")
+    @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        // If we already have this item instantiated, there is nothing
+        // to do.  This can happen when we are restoring the entire pager
+        // from its saved state, where the fragment manager has already
+        // taken care of restoring the fragments we previously had instantiated.
+        if (mFragments.size() > position) {
+            Fragment f = mFragments.get(position);
+            if (f != null) {
+                return super.instantiateItem(container, position);
+            }
+        }
+        if (mCurTransaction == null) {
+            mCurTransaction = mFragmentManager.beginTransaction();
+        }
+        Fragment fragment = getFragment(getItem(position), position);
+        if (DEBUG) Log.d(TAG, "Adding item #" + position + ": f=" + fragment);
+        if (mSavedState.size() > position) {
+            Fragment.SavedState fss = mSavedState.get(position);
+            if (fss != null) {
+                fragment.setInitialSavedState(fss);
+            }
+        }
+        while (mFragments.size() <= position) {
+            mFragments.add(null);
+        }
+        fragment.setMenuVisibility(false);
+        fragment.setUserVisibleHint(false);
+        mFragments.set(position, fragment);
+        mCurTransaction.add(container.getId(), fragment);
+        return super.instantiateItem(container, position);
+    }
+```