Java tutorial
/* * Copyright (C) 2010-2014 The MPDroid 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.audiokernel.euphonyrmt.library; import com.audiokernel.euphonyrmt.MPDroidActivities; import com.audiokernel.euphonyrmt.R; import com.audiokernel.euphonyrmt.fragments.AlbumsFragment; import com.audiokernel.euphonyrmt.fragments.AlbumsGridFragment; import com.audiokernel.euphonyrmt.fragments.BrowseFragment; import com.audiokernel.euphonyrmt.fragments.FSFragment; import com.audiokernel.euphonyrmt.fragments.LibraryFragment; import com.audiokernel.euphonyrmt.fragments.SongsFragment; import com.audiokernel.euphonyrmt.fragments.StreamsFragment; import com.audiokernel.euphonyrmt.helpers.MPDControl; import org.a0z.mpd.item.Album; import org.a0z.mpd.item.Artist; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.annotation.NonNull; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentManager.OnBackStackChangedListener; import android.support.v4.app.FragmentTransaction; import android.support.v7.app.ActionBar; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.MenuItem; import android.widget.TextView; public class SimpleLibraryActivity extends MPDroidActivities.MPDroidActivity implements ILibraryFragmentActivity, OnBackStackChangedListener { private static final String EXTRA_ALBUM = "album"; private static final String EXTRA_ARTIST = "artist"; private static final String EXTRA_FOLDER = "folder"; private static final String EXTRA_STREAM = "streams"; private static final String TAG = "SimpleLibraryActivity"; private TextView mTitleView; private String debugIntent(final Intent intent) { final ComponentName callingActivity = getCallingActivity(); final StringBuilder stringBuilder = new StringBuilder(); final Bundle extras = intent.getExtras(); stringBuilder.append("SimpleLibraryActivity started with invalid extra"); if (callingActivity != null) { stringBuilder.append(", calling activity: "); stringBuilder.append(callingActivity.getClassName()); } if (extras != null) { for (final String what : extras.keySet()) { stringBuilder.append(", intent extra: "); stringBuilder.append(what); } } stringBuilder.append('.'); return stringBuilder.toString(); } private Fragment getRootFragment() { final Intent intent = getIntent(); final Fragment rootFragment; if (intent.hasExtra(EXTRA_ALBUM)) { final Album album = intent.getParcelableExtra(EXTRA_ALBUM); rootFragment = new SongsFragment().init(album); } else if (intent.hasExtra(EXTRA_ARTIST)) { final Artist artist = intent.getParcelableExtra(EXTRA_ARTIST); final SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mApp); if (settings.getBoolean(LibraryFragment.PREFERENCE_ALBUM_LIBRARY, true)) { rootFragment = new AlbumsGridFragment(artist); } else { rootFragment = new AlbumsFragment(artist); } } else if (intent.hasExtra(EXTRA_FOLDER)) { final String folder = intent.getStringExtra(EXTRA_FOLDER); rootFragment = new FSFragment().init(folder); } else if (intent.hasExtra(EXTRA_STREAM)) { rootFragment = new StreamsFragment(); } else { throw new IllegalStateException(debugIntent(intent)); } return rootFragment; } @Override public void onBackStackChanged() { refreshTitleFromCurrentFragment(); } @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.library_tabs); final LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); mTitleView = (TextView) inflater.inflate(R.layout.actionbar_title, null); mTitleView.setFocusable(true); mTitleView.setFocusableInTouchMode(true); mTitleView.setSelected(true); mTitleView.requestFocus(); final ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { actionBar.setCustomView(mTitleView); actionBar.setDisplayShowTitleEnabled(false); actionBar.setDisplayShowCustomEnabled(true); } if (savedInstanceState == null) { final Fragment rootFragment = getRootFragment(); if (rootFragment == null) { throw new RuntimeException("Error : SimpleLibraryActivity root fragment is null"); } if (rootFragment instanceof BrowseFragment) { setTitle(((BrowseFragment) rootFragment).getTitle()); } final FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); ft.replace(R.id.root_frame, rootFragment); ft.commit(); } else { refreshTitleFromCurrentFragment(); } getSupportFragmentManager().addOnBackStackChangedListener(this); } @Override public boolean onKeyDown(final int keyCode, final KeyEvent event) { final boolean result; if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP) { // For onKeyLongPress to work event.startTracking(); result = !mApp.isLocalAudible(); } else { result = super.onKeyDown(keyCode, event); } return result; } @Override public boolean onKeyLongPress(final int keyCode, final KeyEvent event) { boolean result = true; switch (keyCode) { case KeyEvent.KEYCODE_VOLUME_UP: MPDControl.run(MPDControl.ACTION_NEXT); break; case KeyEvent.KEYCODE_VOLUME_DOWN: MPDControl.run(MPDControl.ACTION_PREVIOUS); break; default: result = super.onKeyLongPress(keyCode, event); break; } return result; } @Override public boolean onKeyUp(final int keyCode, @NonNull final KeyEvent event) { boolean result = true; if (event.isTracking() && !event.isCanceled() && !mApp.isLocalAudible()) { switch (keyCode) { case KeyEvent.KEYCODE_VOLUME_UP: MPDControl.run(MPDControl.ACTION_VOLUME_STEP_UP); break; case KeyEvent.KEYCODE_VOLUME_DOWN: MPDControl.run(MPDControl.ACTION_VOLUME_STEP_DOWN); break; default: result = super.onKeyUp(keyCode, event); break; } } else { result = super.onKeyUp(keyCode, event); } return result; } @Override public boolean onOptionsItemSelected(final MenuItem item) { boolean result = false; if (item.getItemId() == android.R.id.home) { finish(); result = true; } return result; } @Override public void pushLibraryFragment(final Fragment fragment, final String label) { final String title; if (fragment instanceof BrowseFragment) { title = ((BrowseFragment) fragment).getTitle(); } else { title = fragment.toString(); } setTitle(title); final FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); ft.replace(R.id.root_frame, fragment); ft.addToBackStack(label); ft.setBreadCrumbTitle(title); ft.commit(); } private void refreshTitleFromCurrentFragment() { final FragmentManager supportFM = getSupportFragmentManager(); final int fmStackCount = supportFM.getBackStackEntryCount(); if (fmStackCount > 0) { setTitle(supportFM.getBackStackEntryAt(fmStackCount - 1).getBreadCrumbTitle()); } else { final Fragment displayedFragment = getSupportFragmentManager().findFragmentById(R.id.root_frame); if (displayedFragment instanceof BrowseFragment) { setTitle(((BrowseFragment) displayedFragment).getTitle()); } else { setTitle(displayedFragment.toString()); } } } @Override public void setTitle(final CharSequence title) { super.setTitle(title); mTitleView.setText(title); } @Override public void setTitle(final int titleId) { super.setTitle(titleId); mTitleView.setText(getString(titleId)); } }