Java tutorial
/* * Copyright (C) 2014 The Android Open Source Project * * 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.phearom.um.ui; import android.app.ActivityOptions; import android.app.FragmentManager; import android.content.Intent; import android.content.res.Configuration; import android.os.Bundle; 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.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import com.phearom.um.R; import com.phearom.um.utils.LogHelper; public abstract class ActionBarCastActivity extends AppCompatActivity { private static final String TAG = LogHelper.makeLogTag(ActionBarCastActivity.class); private static final int DELAY_MILLIS = 1000; private MenuItem mMediaRouteMenuItem; private Toolbar mToolbar; private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private boolean mToolbarInitialized; private int mItemToOpenWhenDrawerCloses = -1; private final DrawerLayout.DrawerListener mDrawerListener = new DrawerLayout.DrawerListener() { @Override public void onDrawerClosed(View drawerView) { if (mDrawerToggle != null) mDrawerToggle.onDrawerClosed(drawerView); if (mItemToOpenWhenDrawerCloses >= 0) { Bundle extras = ActivityOptions .makeCustomAnimation(ActionBarCastActivity.this, R.anim.fade_in, R.anim.fade_out) .toBundle(); Class activityClass = null; switch (mItemToOpenWhenDrawerCloses) { case R.id.navigation_allmusic: activityClass = MusicPlayerActivity.class; break; case R.id.navigation_playlists: activityClass = PlaceholderActivity.class; break; } if (activityClass != null) { startActivity(new Intent(ActionBarCastActivity.this, activityClass), extras); finish(); } } } @Override public void onDrawerStateChanged(int newState) { if (mDrawerToggle != null) mDrawerToggle.onDrawerStateChanged(newState); } @Override public void onDrawerSlide(View drawerView, float slideOffset) { if (mDrawerToggle != null) mDrawerToggle.onDrawerSlide(drawerView, slideOffset); } @Override public void onDrawerOpened(View drawerView) { if (mDrawerToggle != null) mDrawerToggle.onDrawerOpened(drawerView); if (getSupportActionBar() != null) getSupportActionBar().setTitle(R.string.app_name); } }; private final FragmentManager.OnBackStackChangedListener mBackStackChangedListener = new FragmentManager.OnBackStackChangedListener() { @Override public void onBackStackChanged() { updateDrawerToggle(); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LogHelper.d(TAG, "Activity onCreate"); } @Override protected void onStart() { super.onStart(); if (!mToolbarInitialized) { throw new IllegalStateException( "You must run super.initializeToolbar at " + "the end of your onCreate method"); } } @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); if (mDrawerToggle != null) { mDrawerToggle.syncState(); } } @Override public void onResume() { super.onResume(); getFragmentManager().addOnBackStackChangedListener(mBackStackChangedListener); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); if (mDrawerToggle != null) { mDrawerToggle.onConfigurationChanged(newConfig); } } @Override public void onPause() { super.onPause(); getFragmentManager().removeOnBackStackChangedListener(mBackStackChangedListener); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle != null && mDrawerToggle.onOptionsItemSelected(item)) { return true; } if (item != null && item.getItemId() == android.R.id.home) { onBackPressed(); return true; } return super.onOptionsItemSelected(item); } @Override public void onBackPressed() { if (mDrawerLayout != null && mDrawerLayout.isDrawerOpen(GravityCompat.START)) { mDrawerLayout.closeDrawers(); return; } FragmentManager fragmentManager = getFragmentManager(); if (fragmentManager.getBackStackEntryCount() > 0) { fragmentManager.popBackStack(); } else { super.onBackPressed(); } } @Override public void setTitle(CharSequence title) { super.setTitle(title); mToolbar.setTitle(title); } @Override public void setTitle(int titleId) { super.setTitle(titleId); mToolbar.setTitle(titleId); } protected void initializeToolbar() { if (mToolbar == null) { throw new IllegalStateException("Layout is required to include a Toolbar with id " + "'toolbar'"); } mToolbar.inflateMenu(R.menu.main); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); if (mDrawerLayout != null) { NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); if (navigationView == null) { throw new IllegalStateException("Layout requires a NavigationView " + "with id 'nav_view'"); } mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open_content_drawer, R.string.close_content_drawer); mDrawerLayout.addDrawerListener(mDrawerListener); populateDrawerItems(navigationView); setSupportActionBar(mToolbar); updateDrawerToggle(); } else { setSupportActionBar(mToolbar); } mToolbarInitialized = true; } private void populateDrawerItems(NavigationView navigationView) { navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(MenuItem menuItem) { menuItem.setChecked(true); mItemToOpenWhenDrawerCloses = menuItem.getItemId(); mDrawerLayout.closeDrawers(); return true; } }); if (MusicPlayerActivity.class.isAssignableFrom(getClass())) { navigationView.setCheckedItem(R.id.navigation_allmusic); } else if (PlaceholderActivity.class.isAssignableFrom(getClass())) { navigationView.setCheckedItem(R.id.navigation_playlists); } } protected void updateDrawerToggle() { if (mDrawerToggle == null) { return; } boolean isRoot = getFragmentManager().getBackStackEntryCount() == 0; mDrawerToggle.setDrawerIndicatorEnabled(isRoot); if (getSupportActionBar() != null) { getSupportActionBar().setDisplayShowHomeEnabled(!isRoot); getSupportActionBar().setDisplayHomeAsUpEnabled(!isRoot); getSupportActionBar().setHomeButtonEnabled(!isRoot); } if (isRoot) { mDrawerToggle.syncState(); } } }