Java tutorial
/* * Copyright 2012 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.larswerkman.quickreturnlistview; import android.annotation.SuppressLint; import android.os.Build; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewTreeObserver; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.TranslateAnimation; import android.widget.AbsListView; import android.widget.ArrayAdapter; import android.widget.TextView; import android.widget.AbsListView.OnScrollListener; public class AnimationFragment extends ListFragment { private QuickReturnListView mListView; private View mHeader; private TextView mQuickReturnView; private View mPlaceHolder; private int mCachedVerticalScrollRange; private int mQuickReturnHeight; private static final int STATE_ONSCREEN = 0; private static final int STATE_OFFSCREEN = 1; private static final int STATE_RETURNING = 2; private static final int STATE_EXPANDED = 3; private int mState = STATE_ONSCREEN; private int mScrollY; private int mMinRawY = 0; private int rawY; private boolean noAnimation = false; private TranslateAnimation anim; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment, null); mHeader = inflater.inflate(R.layout.header, null); mQuickReturnView = (TextView) view.findViewById(R.id.sticky); mPlaceHolder = mHeader.findViewById(R.id.placeholder); return view; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mListView = (QuickReturnListView) getListView(); mQuickReturnView.setText("Animation"); mListView.addHeaderView(mHeader); String[] array = new String[] { "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android", "Android" }; setListAdapter(new ArrayAdapter<String>(getActivity(), R.layout.list_item, R.id.text1, array)); mListView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { mQuickReturnHeight = mQuickReturnView.getHeight(); mListView.computeScrollY(); mCachedVerticalScrollRange = mListView.getListHeight(); } }); mListView.setOnScrollListener(new OnScrollListener() { @SuppressLint("NewApi") @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { mScrollY = 0; int translationY = 0; if (mListView.scrollYIsComputed()) { mScrollY = mListView.getComputedScrollY(); } rawY = mPlaceHolder.getTop() - Math.min(mCachedVerticalScrollRange - mListView.getHeight(), mScrollY); switch (mState) { case STATE_OFFSCREEN: if (rawY <= mMinRawY) { mMinRawY = rawY; } else { mState = STATE_RETURNING; } translationY = rawY; break; case STATE_ONSCREEN: if (rawY < -mQuickReturnHeight) { System.out.println("test3"); mState = STATE_OFFSCREEN; mMinRawY = rawY; } translationY = rawY; break; case STATE_RETURNING: if (translationY > 0) { translationY = 0; mMinRawY = rawY - mQuickReturnHeight; } else if (rawY > 0) { mState = STATE_ONSCREEN; translationY = rawY; } else if (translationY < -mQuickReturnHeight) { mState = STATE_OFFSCREEN; mMinRawY = rawY; } else if (mQuickReturnView.getTranslationY() != 0 && !noAnimation) { noAnimation = true; anim = new TranslateAnimation(0, 0, -mQuickReturnHeight, 0); anim.setFillAfter(true); anim.setDuration(250); mQuickReturnView.startAnimation(anim); anim.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationEnd(Animation animation) { noAnimation = false; mMinRawY = rawY; mState = STATE_EXPANDED; } }); } break; case STATE_EXPANDED: if (rawY < mMinRawY - 2 && !noAnimation) { noAnimation = true; anim = new TranslateAnimation(0, 0, 0, -mQuickReturnHeight); anim.setFillAfter(true); anim.setDuration(250); anim.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { noAnimation = false; mState = STATE_OFFSCREEN; } }); mQuickReturnView.startAnimation(anim); } else if (translationY > 0) { translationY = 0; mMinRawY = rawY - mQuickReturnHeight; } else if (rawY > 0) { mState = STATE_ONSCREEN; translationY = rawY; } else if (translationY < -mQuickReturnHeight) { mState = STATE_OFFSCREEN; mMinRawY = rawY; } else { mMinRawY = rawY; } } /** this can be used if the build is below honeycomb **/ if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.HONEYCOMB) { anim = new TranslateAnimation(0, 0, translationY, translationY); anim.setFillAfter(true); anim.setDuration(0); mQuickReturnView.startAnimation(anim); } else { mQuickReturnView.setTranslationY(translationY); } } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } }); } }