Java tutorial
/* * Copyright (C) 2018 AlexMofer * * 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 am.project.x.business.main; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.design.widget.NavigationView; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.widget.Toolbar; import android.text.TextUtils; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import am.project.x.BuildConfig; import am.project.x.R; import am.project.x.base.BaseActivity; import am.project.x.business.about.AboutActivity; import am.project.x.business.developing.DevelopingActivity; import am.project.x.business.main.fragments.DevelopFragment; import am.project.x.business.main.fragments.DrawablesFragment; import am.project.x.business.main.fragments.OthersFragment; import am.project.x.business.main.fragments.WidgetsFragment; import am.project.x.utils.ContextUtils; import am.project.x.utils.ViewUtils; /** * */ public class MainActivity extends BaseActivity implements View.OnClickListener, NavigationView.OnNavigationItemSelectedListener { private static final String EXTRA_FRAGMENT = "current"; private static final String TAG_WIDGETS = "fragment_widgets"; private static final String TAG_DRAWABLES = "fragment_drawables"; private static final String TAG_OTHERS = "fragment_others"; private static final String TAG_DEVELOP = "fragment_develop"; private static final String REPORT = "https://github.com/AlexMofer/ProjectX/issues"; private static final String EMAIL = "moferalex@gmail.com"; private DrawerLayout mVDrawer; private ViewGroup mVContent; private String mCurrent; public static void start(Context context) { context.startActivity(new Intent(context, MainActivity.class)); } @Override protected int getContentViewLayout() { return R.layout.activity_main; } @Override protected void initializeActivity(@Nullable Bundle savedInstanceState) { ViewUtils.setLayoutFullscreen(getWindow().getDecorView(), false); final Toolbar toolbar = findViewById(R.id.main_toolbar); mVDrawer = findViewById(R.id.main_drawer); mVContent = findViewById(R.id.main_lyt_content); final NavigationView navigation = findViewById(R.id.main_navigation); setSupportActionBar(toolbar); final ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, mVDrawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); toggle.setToolbarNavigationClickListener(this); mVDrawer.addDrawerListener(toggle); toggle.syncState(); navigation.setNavigationItemSelectedListener(this); final String tag; final boolean debug = BuildConfig.DEBUG; if (savedInstanceState == null) { tag = TAG_WIDGETS; final MenuItem item = navigation.getMenu().findItem(R.id.main_nav_widgets); item.setChecked(true); setTitle(item.getTitle()); if (debug) DevelopingActivity.start(this); } else { tag = savedInstanceState.getString(EXTRA_FRAGMENT, TAG_WIDGETS); MenuItem item; switch (tag) { default: case TAG_WIDGETS: item = navigation.getMenu().findItem(R.id.main_nav_widgets); break; case TAG_DRAWABLES: item = navigation.getMenu().findItem(R.id.main_nav_drawables); break; case TAG_OTHERS: item = navigation.getMenu().findItem(R.id.main_nav_others); break; case TAG_DEVELOP: item = navigation.getMenu().findItem(R.id.main_nav_develop); break; } item.setChecked(true); setTitle(item.getTitle()); } final MenuItem develop = navigation.getMenu().findItem(R.id.main_nav_develop); develop.setVisible(debug); setFragment(tag); } private void setFragment(String tag) { final String oldTag = mCurrent; mCurrent = tag; final FragmentManager manager = getFragmentManager(); final FragmentTransaction transaction = manager.beginTransaction(); if (!TextUtils.isEmpty(oldTag)) { final Fragment old = manager.findFragmentByTag(oldTag); if (old != null && old.isVisible()) { transaction.hide(old); } } Fragment target = manager.findFragmentByTag(tag); if (target != null && target.isVisible()) return; if (target == null) { switch (tag) { default: case TAG_WIDGETS: target = WidgetsFragment.newInstance(); break; case TAG_DRAWABLES: target = DrawablesFragment.newInstance(); break; case TAG_OTHERS: target = OthersFragment.newInstance(); break; case TAG_DEVELOP: target = DevelopFragment.newInstance(); break; } transaction.add(mVContent.getId(), target, tag); } transaction.show(target); transaction.commit(); } @Override public void onBackPressed() { if (mVDrawer.isDrawerOpen(GravityCompat.START)) { mVDrawer.closeDrawer(GravityCompat.START); return; } super.onBackPressed(); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString(EXTRA_FRAGMENT, mCurrent); } // Listener @Override public void onClick(View v) { onBackPressed(); } @Override public boolean onNavigationItemSelected(@NonNull MenuItem item) { switch (item.getItemId()) { case R.id.main_nav_widgets: setTitle(item.getTitle()); setFragment(TAG_WIDGETS); break; case R.id.main_nav_drawables: setTitle(item.getTitle()); setFragment(TAG_DRAWABLES); break; case R.id.main_nav_others: setTitle(item.getTitle()); setFragment(TAG_OTHERS); break; case R.id.main_nav_develop: setTitle(item.getTitle()); setFragment(TAG_DEVELOP); break; case R.id.main_nav_report: ContextUtils.openBrowser(this, REPORT); break; case R.id.main_nav_contact: ContextUtils.sendEmail(this, null, null, EMAIL); break; case R.id.main_nav_about: AboutActivity.start(this); break; } mVDrawer.closeDrawer(GravityCompat.START); return true; } }