Java tutorial
/* * Firetweet - Twitter client for Android * * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.getlantern.firetweet.fragment.support; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.ContentResolver; import android.content.Context; import android.content.IntentFilter; import android.content.SharedPreferences; import android.graphics.Rect; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.ListFragment; import android.view.Gravity; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import org.getlantern.firetweet.Constants; import org.getlantern.firetweet.activity.iface.IControlBarActivity; import org.getlantern.firetweet.app.FiretweetApplication; import org.getlantern.firetweet.fragment.iface.IBaseFragment; import org.getlantern.firetweet.fragment.iface.RefreshScrollTopInterface; import org.getlantern.firetweet.fragment.iface.SupportFragmentCallback; import org.getlantern.firetweet.util.AsyncTwitterWrapper; import org.getlantern.firetweet.util.ListScrollDistanceCalculator; import org.getlantern.firetweet.util.ListScrollDistanceCalculator.ScrollDistanceListener; import org.getlantern.firetweet.util.MultiSelectManager; import org.getlantern.firetweet.util.ThemeUtils; import org.getlantern.firetweet.util.Utils; import org.getlantern.firetweet.view.ExtendedFrameLayout; import org.getlantern.firetweet.view.iface.IExtendedView.TouchInterceptor; import static android.support.v4.app.ListFragmentTrojan.INTERNAL_EMPTY_ID; import static android.support.v4.app.ListFragmentTrojan.INTERNAL_LIST_CONTAINER_ID; import static android.support.v4.app.ListFragmentTrojan.INTERNAL_PROGRESS_CONTAINER_ID; public class BaseSupportListFragment extends ListFragment implements IBaseFragment, Constants, OnScrollListener, RefreshScrollTopInterface, ScrollDistanceListener { private ListScrollDistanceCalculator mListScrollCounter = new ListScrollDistanceCalculator(); private boolean mIsInstanceStateSaved; private boolean mReachedBottom, mNotReachedBottomBefore; private boolean mReachedTop, mNotReachedTopBefore; private boolean mStoppedPreviously; public final FiretweetApplication getApplication() { return FiretweetApplication.getInstance(getActivity()); } public final ContentResolver getContentResolver() { final Activity activity = getActivity(); if (activity != null) return activity.getContentResolver(); return null; } @Override public Bundle getExtraConfiguration() { final Bundle args = getArguments(); final Bundle extras = new Bundle(); if (args != null && args.containsKey(EXTRA_EXTRAS)) { extras.putAll(args.getBundle(EXTRA_EXTRAS)); } return extras; } public final MultiSelectManager getMultiSelectManager() { return getApplication() != null ? getApplication().getMultiSelectManager() : null; } public final SharedPreferences getSharedPreferences(final String name, final int mode) { final Activity activity = getActivity(); if (activity != null) return activity.getSharedPreferences(name, mode); return null; } public final Object getSystemService(final String name) { final Activity activity = getActivity(); if (activity != null) return activity.getSystemService(name); return null; } @Override public final int getTabPosition() { final Bundle args = getArguments(); return args != null ? args.getInt(EXTRA_TAB_POSITION, -1) : -1; } @Override public void requestFitSystemWindows() { final Activity activity = getActivity(); final Fragment parentFragment = getParentFragment(); final SystemWindowsInsetsCallback callback; if (parentFragment instanceof SystemWindowsInsetsCallback) { callback = (SystemWindowsInsetsCallback) parentFragment; } else if (activity instanceof SystemWindowsInsetsCallback) { callback = (SystemWindowsInsetsCallback) activity; } else { return; } final Rect insets = new Rect(); if (callback.getSystemWindowsInsets(insets)) { fitSystemWindows(insets); } } @Override public void onBaseViewCreated(View view, Bundle savedInstanceState) { } protected void fitSystemWindows(Rect insets) { Utils.makeListFragmentFitsSystemWindows(this, insets); } public AsyncTwitterWrapper getTwitterWrapper() { return getApplication() != null ? getApplication().getTwitterWrapper() : null; } public void invalidateOptionsMenu() { final Activity activity = getActivity(); if (activity == null) return; activity.invalidateOptionsMenu(); } public boolean isInstanceStateSaved() { return mIsInstanceStateSaved; } public boolean isReachedBottom() { return mReachedBottom; } @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mNotReachedBottomBefore = true; mStoppedPreviously = false; mIsInstanceStateSaved = savedInstanceState != null; mListScrollCounter.setScrollDistanceListener(this); final ListView lv = getListView(); lv.setOnScrollListener(this); } @Override public void onAttach(final Activity activity) { super.onAttach(activity); } private final TouchInterceptor mInternalOnTouchListener = new TouchInterceptor() { @Override public boolean dispatchTouchEvent(View view, MotionEvent event) { return false; } @Override public boolean onInterceptTouchEvent(View view, MotionEvent event) { switch (event.getActionMasked()) { case MotionEvent.ACTION_DOWN: { onListTouched(); break; } } return false; } @Override public boolean onTouchEvent(View view, MotionEvent event) { return false; } }; protected void onListTouched() { } @Override public final void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); onBaseViewCreated(view, savedInstanceState); requestFitSystemWindows(); } /** * Provide default implementation to return a simple list view. Subclasses * can override to replace with their own layout. If doing so, the returned * view hierarchy <em>must</em> have a ListView whose id is * {@link android.R.id#list android.R.id.list} and can optionally have a * sibling view id {@link android.R.id#empty android.R.id.empty} that is to * be shown when the list is empty. * <p/> * <p/> * If you are overriding this method with your own custom content, consider * including the standard layout {@link android.R.layout#list_content} in * your layout file, so that you continue to retain all of the standard * behavior of ListFragment. In particular, this is currently the only way * to have the built-in indeterminant progress state be shown. */ @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { final Context context = getActivity(); final FrameLayout root = new FrameLayout(context); // ------------------------------------------------------------------ final LinearLayout pframe = new LinearLayout(context); pframe.setId(INTERNAL_PROGRESS_CONTAINER_ID); pframe.setOrientation(LinearLayout.VERTICAL); pframe.setVisibility(View.GONE); pframe.setGravity(Gravity.CENTER); final ProgressBar progress = new ProgressBar(context, null, android.R.attr.progressBarStyleLarge); pframe.addView(progress, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); root.addView(pframe, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); // ------------------------------------------------------------------ final ExtendedFrameLayout lframe = new ExtendedFrameLayout(context); lframe.setId(INTERNAL_LIST_CONTAINER_ID); lframe.setTouchInterceptor(mInternalOnTouchListener); final TextView tv = new TextView(getActivity()); tv.setTextAppearance(context, ThemeUtils.getTextAppearanceLarge(context)); tv.setId(INTERNAL_EMPTY_ID); tv.setGravity(Gravity.CENTER); lframe.addView(tv, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); final ListView lv = new ListView(getActivity()); lv.setId(android.R.id.list); lv.setDrawSelectorOnTop(false); lv.setOnScrollListener(this); lframe.addView(lv, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); root.addView(lframe, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); // ------------------------------------------------------------------ root.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); return root; } @Override public void onDestroy() { mStoppedPreviously = false; super.onDestroy(); } @Override public void onDetach() { super.onDetach(); final Fragment fragment = getParentFragment(); if (fragment instanceof SupportFragmentCallback) { ((SupportFragmentCallback) fragment).onDetachFragment(this); } final Activity activity = getActivity(); if (activity instanceof SupportFragmentCallback) { ((SupportFragmentCallback) activity).onDetachFragment(this); } } public void onPostStart() { } public void onRestart() { } @Override public void onScroll(final AbsListView view, final int firstVisibleItem, final int visibleItemCount, final int totalItemCount) { mListScrollCounter.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount); final ListAdapter adapter = getListAdapter(); if (adapter == null) return; final boolean reachedTop = firstVisibleItem == 0; final boolean reachedBottom = firstVisibleItem + visibleItemCount >= totalItemCount && totalItemCount >= visibleItemCount; if (mReachedBottom != reachedBottom) { mReachedBottom = reachedBottom; if (mReachedBottom && mNotReachedBottomBefore) { mNotReachedBottomBefore = false; return; } if (mReachedBottom && adapter.getCount() > visibleItemCount) { onReachedBottom(); } } if (mReachedTop != reachedTop) { mReachedTop = reachedTop; if (mReachedTop && mNotReachedTopBefore) { mNotReachedTopBefore = false; return; } if (mReachedTop && adapter.getCount() > visibleItemCount) { onReachedTop(); } } } @Override public void onScrollStateChanged(final AbsListView view, final int scrollState) { mListScrollCounter.onScrollStateChanged(view, scrollState); } @Override public void onStart() { super.onStart(); onPostStart(); if (mStoppedPreviously) { onRestart(); } mStoppedPreviously = false; } @Override public void onStop() { mStoppedPreviously = true; super.onStop(); } public void registerReceiver(final BroadcastReceiver receiver, final IntentFilter filter) { final Activity activity = getActivity(); if (activity == null) return; activity.registerReceiver(receiver, filter); } @Override public boolean scrollToStart() { final Activity activity = getActivity(); if (!isAdded() || activity == null) return false; Utils.scrollListToTop(getListView()); if (activity instanceof IControlBarActivity) { ((IControlBarActivity) activity).setControlBarOffset(1); } return true; } public void setProgressBarIndeterminateVisibility(final boolean visible) { final Activity activity = getActivity(); if (activity == null) return; activity.setProgressBarIndeterminateVisibility(visible); } @Override public void setSelection(final int position) { if (getView() == null) return; Utils.scrollListToPosition(getListView(), position); } @Override public void setUserVisibleHint(final boolean isVisibleToUser) { super.setUserVisibleHint(isVisibleToUser); final Fragment fragment = getParentFragment(); if (fragment instanceof SupportFragmentCallback) { ((SupportFragmentCallback) fragment).onSetUserVisibleHint(this, isVisibleToUser); } final Activity activity = getActivity(); if (activity instanceof SupportFragmentCallback) { ((SupportFragmentCallback) activity).onSetUserVisibleHint(this, isVisibleToUser); } } @Override public boolean triggerRefresh() { return false; } public void unregisterReceiver(final BroadcastReceiver receiver) { final Activity activity = getActivity(); if (activity == null) return; activity.unregisterReceiver(receiver); } protected void onReachedBottom() { } protected void onReachedTop() { } @Override public void onScrollDistanceChanged(int delta, int total) { // final FragmentActivity a = getActivity(); // if (a instanceof IControlBarActivity && getTabPosition() >= 0 && getUserVisibleHint()) { // ((IControlBarActivity) a).moveControlBarBy(delta); // } } }