Java Code Examples for android.support.v4.app.fragment#setInitialSavedState()

@Override
public Fragment getItem(int position, Fragment.SavedState savedState) {
    Fragment f = mFragmentCache.containsKey(position) ? mFragmentCache.get(position)
            : new CheeseListFragment();
    Log.e("test", "getItem:" + position + " from cache" + mFragmentCache.containsKey
            (position));
    if (savedState == null || f.getArguments() == null) {
        Bundle bundle = new Bundle();
        bundle.putInt("index", position);
        f.setArguments(bundle);
        Log.e("test", "setArguments:" + position);
    } else if (!mFragmentCache.containsKey(position)) {
        f.setInitialSavedState(savedState);
        Log.e("test", "setInitialSavedState:" + position);
    }
    mFragmentCache.put(position, f);
    return f;
}
 

@Override
public Fragment getItem(int position, Fragment.SavedState savedState) {
    position = mRecyclerView.transformToActualPosition(position);
    Fragment f = mFragmentCache.containsKey(position) ? mFragmentCache.get(position)
            : new CheeseListFragment();
    Log.e("test", "getItem:" + position + " from cache" + mFragmentCache.containsKey
            (position));
    if (savedState == null || f.getArguments() == null) {
        Bundle bundle = new Bundle();
        bundle.putInt("index", position);
        f.setArguments(bundle);
        Log.e("test", "setArguments:" + position);
    } else if (!mFragmentCache.containsKey(position)) {
        f.setInitialSavedState(savedState);
        Log.e("test", "setInitialSavedState:" + position);
    }
    mFragmentCache.put(position, f);
    return f;
}
 

@SuppressLint("LongLogTag")
@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) Log.v(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 fragment;
}
 

@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG)
        Log.v(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);
    mFragments.set(position, fragment);
    mCurTransaction.add(container.getId(), fragment, getTag(position));

    return fragment;
}
 

@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) {
        Log.v(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, getTag(position));

    return fragment;
}
 

@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) Log.v(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 fragment;
}
 

@NonNull
public Fragment toFragment(@NonNull Context context) {
  Fragment f = Fragment.instantiate(context, fname);
  f.setInitialSavedState(state);
  f.setArguments(args);
  return f;
}
 

@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);
}
 

@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 f;
		}
	}

	if (mCurTransaction == null) {
		mCurTransaction = mFragmentManager.beginTransaction();
	}

	Fragment fragment = getItem(position);
	if (DEBUG)
		Log.v(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 fragment;
}
 

@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.
    // -----------------------------------------------------------------------------------------

    Fragment existingFragment = getFragment(position);
    if (existingFragment != null) {
        return existingFragment;
    }

    // -----------------------------------------------------------------------------------------
    // Else, continue with normal flow.
    // -----------------------------------------------------------------------------------------

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = instantiateFragment(position);
    if (DEBUG) Log.v(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 fragment;
}
 

@Override
@NonNull
public Object instantiateItem(ViewGroup container, int position) {
    long tag = getItemId(position);
    Fragment fragment = mFragments.get(tag);
    // 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 (fragment != null) {
        return fragment;
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    fragment = getItem(position);
    // restore state
    final Fragment.SavedState savedState = mSavedStates.get(tag);
    if (savedState != null) {
        fragment.setInitialSavedState(savedState);
    }
    fragment.setMenuVisibility(false);
    fragment.setUserVisibleHint(false);
    mFragments.put(tag, fragment);
    mCurTransaction.add(container.getId(), fragment, "f" + tag);

    return fragment;
}
 

@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) Log.v(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 fragment;
}
 

@SuppressLint("LongLogTag")
@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) Log.v(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 fragment;
}
 

@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 f;
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) Log.v(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 fragment;
}
 

@Override
@NonNull
public Object instantiateItem(ViewGroup container, int position) {
    long tag = getItemId(position);
    Fragment fragment = mFragments.get(tag);
    // 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 (fragment != null) {
        return fragment;
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    fragment = getItem(position);
    // restore state
    final Fragment.SavedState savedState = mSavedStates.get(tag);
    if (savedState != null) {
        fragment.setInitialSavedState(savedState);
    }
    fragment.setMenuVisibility(false);
    fragment.setUserVisibleHint(false);
    mFragments.put(tag, fragment);
    mCurTransaction.add(container.getId(), fragment, "f" + tag);

    return fragment;
}
 

@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 (mItemInfos.size() > position) {
        ItemInfo ii = mItemInfos.get(position);
        if (ii != null) {
            //判断位置是否相等，如果不相等说明新数据有增加或删除(导致了ViewPager那边有空位)，
            // 而这时notifyDataSetChanged方法还没有完成，ViewPager会先调用instantiateItem来获取新的页面
            //所以为了不取错页面，我们需要对缓存进行检查和调整位置：checkProcessCacheChanged
            if (ii.position == position) {
                return ii;
            } else {
                checkProcessCacheChanged();
            }
        }
    }

    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    Fragment fragment = getItem(position);
    if (DEBUG) Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
    if (mSavedState.size() > position) {
        Fragment.SavedState fss = mSavedState.get(position);
        if (fss != null) {
            fragment.setInitialSavedState(fss);
        }
    }
    while (mItemInfos.size() <= position) {
        mItemInfos.add(null);
    }
    fragment.setMenuVisibility(false);
    fragment.setUserVisibleHint(false);
    ItemInfo<T> iiNew = new ItemInfo<>(fragment, getItemData(position), position);
    mItemInfos.set(position, iiNew);
    mCurTransaction.add(container.getId(), fragment);

    return iiNew;
}
 

private void restoreFragmentState(int index, Fragment fragment) {
    Fragment.SavedState savedState = savedStateSparseArray.get(index);
    fragment.setInitialSavedState(savedState);
}