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@@ -9,10 +9,8 @@ import android.os.PersistableBundle;
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import android.preference.PreferenceManager;
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import android.support.design.widget.FloatingActionButton;
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import android.support.design.widget.TabLayout;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v4.app.FragmentPagerAdapter;
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import android.support.v4.content.ContextCompat;
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import android.support.v4.view.ViewPager;
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import android.util.Log;
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import android.util.SparseArray;
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@@ -40,6 +38,7 @@ public class MainActivity extends BaseActivity {
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private static final String LAST_TAB = "last_tab";
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private static final int DEFAULT_TAB = 0;
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private ModifyOffsetOnPageChangeListener mModifyFabPositionListener;
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/**
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* The {@link android.support.v4.view.PagerAdapter} that will provide
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* fragments for each of the sections. We use a
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@@ -51,25 +50,11 @@ public class MainActivity extends BaseActivity {
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private SectionsPagerAdapter mSectionsPagerAdapter;
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private Drawable mAddItemDrawable;
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// // For delaying fab.show() on SCROLL_STATE_SETTLING
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// private final Handler mHandler = new Handler();
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//
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// private boolean mScrollStateDragging;
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// private int mPageDragging = -1; // TOneverDO: initial value >= 0
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// private boolean mDraggingPastEndBoundaries;
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@Bind(R.id.container)
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ViewPager mViewPager;
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@Bind(R.id.fab)
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FloatingActionButton mFab;
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// // https://medium.com/@chrisbanes/appcompat-v23-2-age-of-the-vectors-91cbafa87c88#.141274xy8
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// // This is needed to load vector drawables from 23.4.0
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// static {
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// AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
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// }
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@Override
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protected void onCreate(final Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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@@ -86,7 +71,7 @@ public class MainActivity extends BaseActivity {
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public void run() {
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if (mViewPager.getCurrentItem() == mSectionsPagerAdapter.getCount() - 1) {
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// Restore the FAB's translationX from a previous configuration.
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mFab.setTranslationX(mViewPager.getWidth() / -2f + getFabPixelOffsetForXTranslation());
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mFab.setTranslationX(mViewPager.getWidth() / -2f + getFabPixelOffsetForXTranslation(mFab));
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}
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}
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});
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@@ -95,124 +80,7 @@ public class MainActivity extends BaseActivity {
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// primary sections of the activity.
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mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
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mViewPager.setAdapter(mSectionsPagerAdapter);
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mViewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
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/**
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* @param position Either the current page position if the offset is increasing,
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* or the previous page position if it is decreasing.
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* @param positionOffset If increasing from [0, 1), scrolling right and position = currentPagePosition
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* If decreasing from (1, 0], scrolling left and position = (currentPagePosition - 1)
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*/
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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Log.d(TAG, String.format("pos = %d, posOffset = %f, posOffsetPixels = %d",
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position, positionOffset, positionOffsetPixels));
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int pageBeforeLast = mSectionsPagerAdapter.getCount() - 2;
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if (position <= pageBeforeLast) {
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if (position < pageBeforeLast) {
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// When the scrolling is due to tab selection between multiple tabs apart,
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// this callback is called for each intermediate page, but each of those pages
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// will briefly register a sparsely decreasing range of positionOffsets, always
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// from (1, 0). As such, you would notice the FAB to jump back and forth between
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// x-positions as each intermediate page is scrolled through.
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// This is a visual optimization that ends the translation motion, immediately
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// returning the FAB to its target position.
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// TODO: The animation visibly skips to the end. We could interpolate
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// intermediate x-positions if we cared to smooth it out.
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mFab.setTranslationX(0);
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} else {
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// Initially, the FAB's translationX property is zero because, at its original
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// position, it is not translated. setTranslationX() is relative to the view's
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// left position, at its original position; this left position is taken to be
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// the zero point of the coordinate system relative to this view. As your
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// translationX value is increasingly negative, the view is translated left.
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// But as translationX is decreasingly negative and down to zero, the view
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// is translated right, back to its original position.
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float translationX = positionOffsetPixels / -2f;
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// NOTE: You MUST scale your own additional pixel offsets by positionOffset,
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// or else the FAB will immediately translate by that many pixels, appearing
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// to skip/jump.
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translationX += positionOffset * getFabPixelOffsetForXTranslation();
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mFab.setTranslationX(translationX);
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}
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}
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}
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@Override
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public void onPageSelected(int position) {
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Log.d(TAG, "onPageSelected");
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if (position < mSectionsPagerAdapter.getCount() - 1) {
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mFab.setImageDrawable(mAddItemDrawable);
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}
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Fragment f = mSectionsPagerAdapter.getFragment(mViewPager.getCurrentItem());
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// NOTE: This callback is fired after a rotation, right after onStart().
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// Unfortunately, the FragmentManager handling the rotation has yet to
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// tell our adapter to re-instantiate the Fragments, so our collection
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// of fragments is empty. You MUST keep this check so we don't cause a NPE.
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if (f instanceof BaseFragment) {
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((BaseFragment) f).onPageSelected();
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}
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}
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// @Override
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// public void onPageScrollStateChanged(int state) {
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// // TODO: This was not sufficient to prevent the user from quickly
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// // hitting the fab for the previous page.
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// switch (state) {
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// case ViewPager.SCROLL_STATE_DRAGGING:
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// if (mDraggingPastEndBoundaries) {
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// return;
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// }
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// mScrollStateDragging = true;
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// mPageDragging = mViewPager.getCurrentItem();
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// mFab.hide();
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// break;
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// case ViewPager.SCROLL_STATE_SETTLING:
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// if (!mScrollStateDragging) {
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// mFab.hide();
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// }
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// mScrollStateDragging = false;
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// // getCurrentItem() has changed to the target page we're settling on.
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// // 200ms is the same as show/hide animation duration
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// int targetPage = mViewPager.getCurrentItem();
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// if (targetPage != 2) { // TODO: Use page constant
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// int delay = mPageDragging == targetPage ? 0 : 200;
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// mHandler.postDelayed(new Runnable() {
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// @Override
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// public void run() {
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// mFab.show();
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// }
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// }, delay);
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// }
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// mPageDragging = -1;
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// break;
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// case ViewPager.SCROLL_STATE_IDLE:
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// // Nothing
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// break;
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// }
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// }
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});
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// mViewPager.setPageTransformer(false, new ViewPager.PageTransformer() {
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// @Override
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// public void transformPage(View page, float position) {
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// Log.d(TAG, "position: " + position);
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// // position represents a page's offset from the front-and-center position of 0 (the page
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// // that is in full view). Consider pages A, B, C, D.
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// // If we are now on page A (position 0), then pages B, C, and D are respectively
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// // in positions 1, 2, 3.
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// // If we move to the right to page B (now in position 0), then pages A, C, D are
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// // respectively in positions -1, 1, 2.
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// int currentPage = mViewPager.getCurrentItem();
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// // TODO: Use page constants
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// // Page 0 can't move one full page position to the right (i.e. there is no page to
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// // the left of page 0 that can adopt the front-and-center position of 0 while page 0
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// // moves to adopt position 1)
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// mDraggingPastEndBoundaries = currentPage == 0 && position >= 0f
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// // The last page can't move one full page position to the left (i.e. there
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// // is no page to the right of the last page that can adopt the front-and-center
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// // position of 0 while the last page moves to adopt position -1)
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// || currentPage == mSectionsPagerAdapter.getCount() - 1 && position <= 0f;
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// Log.d(TAG, "Draggin past end bounds: " + mDraggingPastEndBoundaries);
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// }
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// });
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this.mModifyFabPositionListener = new ModifyOffsetOnPageChangeListener(mFab, mSectionsPagerAdapter, mViewPager);
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TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
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tabLayout.setupWithViewPager(mViewPager);
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@@ -225,15 +93,13 @@ public class MainActivity extends BaseActivity {
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mFab.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View view) {
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Fragment f = mSectionsPagerAdapter.getFragment(mViewPager.getCurrentItem());
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BaseFragment f = mSectionsPagerAdapter.getFragment(mViewPager.getCurrentItem());
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if (f instanceof RecyclerViewFragment) {
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((RecyclerViewFragment) f).onFabClick();
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}
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}
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});
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mAddItemDrawable = ContextCompat.getDrawable(this, R.drawable.ic_add_24dp);
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final int initialPage = getIntent().getIntExtra(EXTRA_SHOW_PAGE, -1);
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if (initialPage >= 0 && initialPage <= mSectionsPagerAdapter.getCount() - 1) {
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// This is so we don't keep it around when the configuration changes.
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@@ -298,13 +164,10 @@ public class MainActivity extends BaseActivity {
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// http://stackoverflow.com/a/24303360/5055032
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super.onActivityResult(requestCode, resultCode, data);
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switch (requestCode) {
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case REQUEST_THEME_CHANGE:
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if (data != null && data.getBooleanExtra(SettingsActivity.EXTRA_THEME_CHANGED, false)) {
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if (requestCode == REQUEST_THEME_CHANGE
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&& data != null && data.getBooleanExtra(SettingsActivity.EXTRA_THEME_CHANGED, false)) {
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recreate();
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}
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break;
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}
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}
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@Override
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@@ -319,6 +182,18 @@ public class MainActivity extends BaseActivity {
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restoreTab(savedInstanceState, DEFAULT_TAB);
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}
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@Override
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protected void onStart() {
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super.onStart();
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mViewPager.addOnPageChangeListener(mModifyFabPositionListener);
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}
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@Override
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protected void onStop() {
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super.onStop();
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mViewPager.removeOnPageChangeListener(mModifyFabPositionListener);
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}
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@SuppressLint("CommitPrefEdits")
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@Override
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protected void onDestroy() {
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@@ -329,6 +204,7 @@ public class MainActivity extends BaseActivity {
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.commit();
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super.onDestroy();
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this.mModifyFabPositionListener = null;
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}
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@Override
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@@ -367,11 +243,11 @@ public class MainActivity extends BaseActivity {
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* relative to its center position. An X-translation normally is done relative to a view's
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* left position.
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*/
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private float getFabPixelOffsetForXTranslation() {
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private static float getFabPixelOffsetForXTranslation(FloatingActionButton fab) {
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final int margin;
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
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// Since each side's margin is the same, any side's would do.
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margin = ((ViewGroup.MarginLayoutParams) mFab.getLayoutParams()).rightMargin;
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margin = ((ViewGroup.MarginLayoutParams) fab.getLayoutParams()).rightMargin;
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} else {
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// Pre-Lollipop has measurement issues with FAB margins. This is
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// probably as good as we can get to centering the FAB, without
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@@ -381,7 +257,7 @@ public class MainActivity extends BaseActivity {
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// X-translation is done relative to a view's left position; by adding
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// an offset of half the FAB's width, we effectively rebase the translation
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// relative to the view's center position.
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return mFab.getWidth() / 2f + margin;
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return fab.getWidth() / 2f + margin;
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}
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/**
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@@ -392,14 +268,14 @@ public class MainActivity extends BaseActivity {
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// We can't use an ArrayList because the structure reorganizes as elements are removed,
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// so page indices won't stay in sync with list indices. SparseArray allows you to have
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// gaps in your range of indices.
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private final SparseArray<Fragment> mFragments = new SparseArray<>(getCount());
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private final SparseArray<BaseFragment> mFragments = new SparseArray<>(getCount());
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public SectionsPagerAdapter(FragmentManager fm) {
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private SectionsPagerAdapter(FragmentManager fm) {
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super(fm);
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}
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@Override
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public Fragment getItem(int position) {
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public BaseFragment getItem(int position) {
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// getItem is called to instantiate the fragment for the given page.
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switch (position) {
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case PAGE_ALARMS:
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@@ -415,7 +291,7 @@ public class MainActivity extends BaseActivity {
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@Override
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public Object instantiateItem(ViewGroup container, int position) {
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Fragment fragment = (Fragment) super.instantiateItem(container, position);
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BaseFragment fragment = (BaseFragment) super.instantiateItem(container, position);
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mFragments.put(position, fragment);
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return fragment;
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}
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@@ -432,22 +308,80 @@ public class MainActivity extends BaseActivity {
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return 3;
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}
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// TODO: If you wish to have text labels for your tabs, then implement this method.
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// @Override
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// public CharSequence getPageTitle(int position) {
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// switch (position) {
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// case 0:
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// return "SECTION 1";
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// case 1:
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// return "SECTION 2";
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// case 2:
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// return "SECTION 3";
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// }
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// return null;
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// }
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public Fragment getFragment(int position) {
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BaseFragment getFragment(int position) {
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return mFragments.get(position);
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|
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}
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|
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}
|
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private static final class ModifyOffsetOnPageChangeListener extends ViewPager.SimpleOnPageChangeListener {
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private final FloatingActionButton mFab;
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private final SectionsPagerAdapter mSectionsPagerAdapter;
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|
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private final ViewPager mViewPager;
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|
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private ModifyOffsetOnPageChangeListener(final FloatingActionButton mFab,
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final SectionsPagerAdapter mSectionsPagerAdapter,
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|
|
|
|
final ViewPager mViewPager) {
|
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|
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|
this.mFab = mFab;
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|
|
|
this.mSectionsPagerAdapter = mSectionsPagerAdapter;
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|
|
|
this.mViewPager = mViewPager;
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|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
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|
|
|
* @param position Either the current page position if the offset is increasing,
|
|
|
|
|
* or the previous page position if it is decreasing.
|
|
|
|
|
* @param positionOffset If increasing from [0, 1), scrolling right and position = currentPagePosition
|
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|
|
|
* If decreasing from (1, 0], scrolling left and position = (currentPagePosition - 1)
|
|
|
|
|
*/
|
|
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|
|
@Override
|
|
|
|
|
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
|
|
|
|
|
Log.d(TAG, String.format("pos = %d, posOffset = %f, posOffsetPixels = %d",
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|
|
|
|
position, positionOffset, positionOffsetPixels));
|
|
|
|
|
int pageBeforeLast = mSectionsPagerAdapter.getCount() - 2;
|
|
|
|
|
if (position <= pageBeforeLast) {
|
|
|
|
|
if (position < pageBeforeLast) {
|
|
|
|
|
// When the scrolling is due to tab selection between multiple tabs apart,
|
|
|
|
|
// this callback is called for each intermediate page, but each of those pages
|
|
|
|
|
// will briefly register a sparsely decreasing range of positionOffsets, always
|
|
|
|
|
// from (1, 0). As such, you would notice the FAB to jump back and forth between
|
|
|
|
|
// x-positions as each intermediate page is scrolled through.
|
|
|
|
|
// This is a visual optimization that ends the translation motion, immediately
|
|
|
|
|
// returning the FAB to its target position.
|
|
|
|
|
// TODO: The animation visibly skips to the end. We could interpolate
|
|
|
|
|
// intermediate x-positions if we cared to smooth it out.
|
|
|
|
|
mFab.setTranslationX(0);
|
|
|
|
|
} else {
|
|
|
|
|
// Initially, the FAB's translationX property is zero because, at its original
|
|
|
|
|
// position, it is not translated. setTranslationX() is relative to the view's
|
|
|
|
|
// left position, at its original position; this left position is taken to be
|
|
|
|
|
// the zero point of the coordinate system relative to this view. As your
|
|
|
|
|
// translationX value is increasingly negative, the view is translated left.
|
|
|
|
|
// But as translationX is decreasingly negative and down to zero, the view
|
|
|
|
|
// is translated right, back to its original position.
|
|
|
|
|
float translationX = positionOffsetPixels / -2f;
|
|
|
|
|
// NOTE: You MUST scale your own additional pixel offsets by positionOffset,
|
|
|
|
|
// or else the FAB will immediately translate by that many pixels, appearing
|
|
|
|
|
// to skip/jump.
|
|
|
|
|
translationX += positionOffset * getFabPixelOffsetForXTranslation(mFab);
|
|
|
|
|
mFab.setTranslationX(translationX);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
|
public void onPageSelected(int position) {
|
|
|
|
|
Log.d(TAG, "onPageSelected");
|
|
|
|
|
if (position < mSectionsPagerAdapter.getCount() - 1) {
|
|
|
|
|
mFab.setImageResource(R.drawable.ic_add_24dp);
|
|
|
|
|
}
|
|
|
|
|
BaseFragment f = mSectionsPagerAdapter.getFragment(mViewPager.getCurrentItem());
|
|
|
|
|
// NOTE: This callback is fired after a rotation, right after onStart().
|
|
|
|
|
// Unfortunately, the FragmentManager handling the rotation has yet to
|
|
|
|
|
// tell our adapter to re-instantiate the Fragments, so our collection
|
|
|
|
|
// of fragments is empty. You MUST keep this check so we don't cause a NPE.
|
|
|
|
|
if (f != null) {
|
|
|
|
|
f.onPageSelected();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|