Java tutorial
/* * Twidere - Twitter client for Android * * Copyright (C) 2012 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.mariotaku.twidere.activity; import org.mariotaku.twidere.R; import org.mariotaku.twidere.model.Panes; import org.mariotaku.twidere.view.SlidingPaneView; import android.annotation.SuppressLint; import android.content.Context; import android.content.SharedPreferences; import android.content.res.Configuration; import android.content.res.Resources; import android.os.Bundle; import android.support.v4.app.BackStackEntryTrojan; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentManager.BackStackEntry; import android.support.v4.app.FragmentManager.OnBackStackChangedListener; import android.support.v4.app.FragmentManagerTrojan; import android.support.v4.app.FragmentTransaction; import android.view.View; import android.view.ViewGroup; @SuppressLint("Registered") public class DualPaneActivity extends BaseDialogWhenLargeActivity implements OnBackStackChangedListener { private SharedPreferences mPreferences; private SlidingPaneView mSlidingPane; private Fragment mDetailsFragment; private boolean mDualPaneInPortrait, mDualPaneInLandscape; public Fragment getDetailsFragment() { return mDetailsFragment; } public final boolean isDualPaneMode() { return findViewById(PANE_LEFT) instanceof ViewGroup && findViewById(PANE_RIGHT) instanceof ViewGroup; } public final boolean isRightPaneUsed() { final FragmentManager fm = getSupportFragmentManager(); final Fragment right_pane_fragment = fm.findFragmentById(PANE_RIGHT); return right_pane_fragment != null && right_pane_fragment.isAdded(); } @Override public void onBackStackChanged() { if (isDualPaneMode()) { final FragmentManager fm = getSupportFragmentManager(); final int count = fm.getBackStackEntryCount(); final Fragment left_pane_fragment = fm.findFragmentById(PANE_LEFT); final Fragment right_pane_fragment = fm.findFragmentById(PANE_RIGHT); final View main_view = findViewById(R.id.main); final boolean left_pane_used = left_pane_fragment != null && left_pane_fragment.isAdded(); final boolean right_pane_used = right_pane_fragment != null && right_pane_fragment.isAdded(); if (count > 0) { final BackStackEntry entry = fm.getBackStackEntryAt(count - 1); if (entry == null) return; final Fragment fragment = BackStackEntryTrojan.getFragmentInBackStackRecord(entry); if (fragment instanceof Panes.Right) { showRightPane(); } else if (fragment instanceof Panes.Left) { showLeftPane(); } } else { if (fm.findFragmentById(R.id.main) != null || left_pane_used) { showLeftPane(); } else if (right_pane_used) { showRightPane(); } } if (main_view != null) { main_view.setVisibility(left_pane_used ? View.GONE : View.VISIBLE); } } } @Override public void onContentChanged() { super.onContentChanged(); mSlidingPane = (SlidingPaneView) findViewById(R.id.sliding_pane); } @Override public void onCreate(final Bundle savedInstanceState) { mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); super.onCreate(savedInstanceState); final Resources res = getResources(); final int orientation = res.getConfiguration().orientation; final int layout; mDualPaneInPortrait = mPreferences.getBoolean(PREFERENCE_KEY_DUAL_PANE_IN_PORTRAIT, false); mDualPaneInLandscape = mPreferences.getBoolean(PREFERENCE_KEY_DUAL_PANE_IN_LANDSCAPE, false); switch (orientation) { case Configuration.ORIENTATION_LANDSCAPE: layout = mDualPaneInLandscape ? getDualPaneLayoutRes() : getNormalLayoutRes(); break; case Configuration.ORIENTATION_PORTRAIT: layout = mDualPaneInPortrait ? getDualPaneLayoutRes() : getNormalLayoutRes(); break; default: layout = getNormalLayoutRes(); break; } setContentView(layout); final View pane_right = findViewById(PANE_RIGHT); if (pane_right != null) { pane_right.setBackgroundResource(getPaneBackground()); } getSupportFragmentManager().addOnBackStackChangedListener(this); } public final void showAtPane(final int pane, final Fragment fragment, final boolean addToBackStack) { final FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); switch (pane) { case PANE_LEFT: { showLeftPane(); ft.replace(PANE_LEFT, fragment); break; } case PANE_RIGHT: { showRightPane(); ft.replace(PANE_RIGHT, fragment); break; } } if (addToBackStack) { ft.addToBackStack(null); } ft.setTransitionStyle(FragmentTransaction.TRANSIT_FRAGMENT_FADE); ft.commit(); mDetailsFragment = fragment; } public final void showFragment(final Fragment fragment, final boolean add_to_backstack) { if (fragment instanceof Panes.Right) { showAtPane(PANE_RIGHT, fragment, add_to_backstack); } else { showAtPane(PANE_LEFT, fragment, add_to_backstack); } } public final void showLeftPane() { if (mSlidingPane != null) { mSlidingPane.animateClose(); } } public final void showRightPane() { if (mSlidingPane != null) { mSlidingPane.animateOpen(); } } protected int getDualPaneLayoutRes() { return R.layout.base_dual_pane; } protected int getNormalLayoutRes() { return R.layout.base; } @Override protected void onStart() { final FragmentManager fm = getSupportFragmentManager(); if (!isDualPaneMode() && !FragmentManagerTrojan.isStateSaved(fm)) { final int count = fm.getBackStackEntryCount(); for (int i = 0; i < count; i++) { fm.popBackStackImmediate(); } } super.onStart(); final boolean dual_pane_in_portrait = mPreferences.getBoolean(PREFERENCE_KEY_DUAL_PANE_IN_PORTRAIT, false); final boolean dual_pane_in_landscape = mPreferences.getBoolean(PREFERENCE_KEY_DUAL_PANE_IN_LANDSCAPE, false); final Resources res = getResources(); final int orientation = res.getConfiguration().orientation; switch (orientation) { case Configuration.ORIENTATION_LANDSCAPE: if (mDualPaneInLandscape != dual_pane_in_landscape) { restart(); } break; case Configuration.ORIENTATION_PORTRAIT: if (mDualPaneInPortrait != dual_pane_in_portrait) { restart(); } break; } } @Override protected boolean shouldDisableDialogWhenLargeMode() { return true; } private int getPaneBackground() { final boolean dark = isDarkTheme(), solid = isSolidColorBackground(); return dark ? solid ? android.R.color.black : R.drawable.background_holo_dark : solid ? android.R.color.white : R.drawable.background_holo_light; } }