Java tutorial
/* * Copyright 2013 serso aka se.solovyev * * 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. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * Contact details * * Email: se.solovyev@gmail.com * Site: http://se.solovyev.org */ package org.solovyev.android.calculator.floating; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.IBinder; import android.support.v4.app.NotificationCompat; import android.util.DisplayMetrics; import android.view.WindowManager; import com.squareup.otto.Bus; import com.squareup.otto.Subscribe; import org.solovyev.android.Check; import org.solovyev.android.calculator.*; import org.solovyev.android.calculator.ga.Ga; import javax.annotation.Nonnull; import javax.annotation.Nullable; import javax.inject.Inject; import static org.solovyev.android.calculator.App.cast; public class FloatingCalculatorService extends Service implements FloatingViewListener, SharedPreferences.OnSharedPreferenceChangeListener { private static final String SHOW_WINDOW_ACTION = "org.solovyev.android.calculator.floating.SHOW_WINDOW"; private static final String SHOW_NOTIFICATION_ACTION = "org.solovyev.android.calculator.floating.SHOW_NOTIFICATION"; private static final int NOTIFICATION_ID = 9031988; // my birthday =) private FloatingCalculatorView view; @Inject Bus bus; @Inject Editor editor; @Inject Display display; @Inject Ga ga; @Inject SharedPreferences preferences; public static void show(@Nonnull Context context) { context.sendBroadcast(createShowWindowIntent(context)); } @Nonnull private static Intent createShowWindowIntent(@Nonnull Context context) { final Intent intent = new Intent(SHOW_WINDOW_ACTION); intent.setClass(context, FloatingCalculatorBroadcastReceiver.class); return intent; } @Override public IBinder onBind(Intent intent) { return null; } private void createView() { if (view != null) { return; } final WindowManager wm = ((WindowManager) this.getSystemService(Context.WINDOW_SERVICE)); final DisplayMetrics dm = getResources().getDisplayMetrics(); final android.view.Display dd = wm.getDefaultDisplay(); //noinspection deprecation final int maxWidth = 2 * Math.min(dd.getWidth(), dd.getHeight()) / 3; final int desiredWidth = App.toPixels(dm, 300); final int width = Math.min(maxWidth, desiredWidth); final int height = getHeight(width); final FloatingCalculatorView.State state = new FloatingCalculatorView.State(width, height, -1, -1); view = new FloatingCalculatorView(this, state, this); view.show(); view.updateEditorState(editor.getState()); view.updateDisplayState(display.getState()); bus.register(this); preferences.registerOnSharedPreferenceChangeListener(this); } private int getHeight(int width) { return 4 * width / 3; } @Override public void onCreate() { super.onCreate(); cast(getApplication()).getComponent().inject(this); } @Override public void onDestroy() { if (view != null) { preferences.unregisterOnSharedPreferenceChangeListener(this); bus.unregister(this); view.hide(); view = null; } super.onDestroy(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { final int result = super.onStartCommand(intent, flags, startId); handleStart(intent); return result; } private void handleStart(@Nullable Intent intent) { if (intent == null) { return; } if (isShowWindowIntent(intent)) { hideNotification(); createView(); ga.onFloatingCalculatorOpened(); } else if (isShowNotificationIntent(intent)) { showNotification(); } } private boolean isShowNotificationIntent(@Nonnull Intent intent) { return intent.getAction().equals(SHOW_NOTIFICATION_ACTION); } private boolean isShowWindowIntent(@Nonnull Intent intent) { return intent.getAction().equals(SHOW_WINDOW_ACTION); } private void hideNotification() { final NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); nm.cancel(NOTIFICATION_ID); } @Override public void onViewMinimized() { showNotification(); stopSelf(); } @Override public void onViewHidden() { stopSelf(); } private void showNotification() { final NotificationCompat.Builder builder = new NotificationCompat.Builder(this); builder.setSmallIcon(R.drawable.kb_logo); builder.setContentTitle(getText(R.string.c_app_name)); builder.setContentText(getString(R.string.open_onscreen_calculator)); builder.setOngoing(true); final Intent intent = createShowWindowIntent(this); builder.setContentIntent(PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)); final NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); nm.notify(NOTIFICATION_ID, builder.build()); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { Check.isNotNull(view); if (Preferences.Gui.theme.isSameKey(key) || Preferences.Onscreen.theme.isSameKey(key)) { stopSelf(); FloatingCalculatorService.show(this); } } @Subscribe public void onEditorChanged(@Nonnull Editor.ChangedEvent e) { Check.isNotNull(view); view.updateEditorState(e.newState); } @Subscribe public void onCursorMoved(@Nonnull Editor.CursorMovedEvent e) { Check.isNotNull(view); view.updateEditorState(e.state); } @Subscribe public void onDisplayChanged(@Nonnull Display.ChangedEvent e) { Check.isNotNull(view); view.updateDisplayState(e.newState); } }