Java tutorial
/* * Copyright (C) 2015 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 android.support.v7.app; import android.app.Notification; import android.app.PendingIntent; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.os.Build; import android.os.SystemClock; import android.support.v4.app.NotificationBuilderWithBuilderAccessor; import android.support.v4.app.NotificationCompatBase; import android.support.v7.appcompat.R; import android.util.TypedValue; import android.view.View; import android.widget.RemoteViews; import java.text.NumberFormat; import java.util.List; /** * Helper class to generate MediaStyle notifications for pre-Lollipop platforms. Overrides * contentView and bigContentView of the notification. */ class NotificationCompatImplBase { static final int MAX_MEDIA_BUTTONS_IN_COMPACT = 3; static final int MAX_MEDIA_BUTTONS = 5; public static <T extends NotificationCompatBase.Action> void overrideContentView( NotificationBuilderWithBuilderAccessor builder, Context context, CharSequence contentTitle, CharSequence contentText, CharSequence contentInfo, int number, Bitmap largeIcon, CharSequence subText, boolean useChronometer, long when, List<T> actions, int[] actionsToShowInCompact, boolean showCancelButton, PendingIntent cancelButtonIntent) { RemoteViews views = generateContentView(context, contentTitle, contentText, contentInfo, number, largeIcon, subText, useChronometer, when, actions, actionsToShowInCompact, showCancelButton, cancelButtonIntent); builder.getBuilder().setContent(views); if (showCancelButton) { builder.getBuilder().setOngoing(true); } } private static <T extends NotificationCompatBase.Action> RemoteViews generateContentView(Context context, CharSequence contentTitle, CharSequence contentText, CharSequence contentInfo, int number, Bitmap largeIcon, CharSequence subText, boolean useChronometer, long when, List<T> actions, int[] actionsToShowInCompact, boolean showCancelButton, PendingIntent cancelButtonIntent) { RemoteViews view = applyStandardTemplate(context, contentTitle, contentText, contentInfo, number, largeIcon, subText, useChronometer, when, R.layout.notification_template_media, true /* fitIn1U */); final int numActions = actions.size(); final int N = actionsToShowInCompact == null ? 0 : Math.min(actionsToShowInCompact.length, MAX_MEDIA_BUTTONS_IN_COMPACT); view.removeAllViews(R.id.media_actions); if (N > 0) { for (int i = 0; i < N; i++) { if (i >= numActions) { throw new IllegalArgumentException(String.format( "setShowActionsInCompactView: action %d out of bounds (max %d)", i, numActions - 1)); } final NotificationCompatBase.Action action = actions.get(actionsToShowInCompact[i]); final RemoteViews button = generateMediaActionButton(context, action); view.addView(R.id.media_actions, button); } } if (showCancelButton) { view.setViewVisibility(R.id.end_padder, View.GONE); view.setViewVisibility(R.id.cancel_action, View.VISIBLE); view.setOnClickPendingIntent(R.id.cancel_action, cancelButtonIntent); view.setInt(R.id.cancel_action, "setAlpha", context.getResources().getInteger(R.integer.cancel_button_image_alpha)); } else { view.setViewVisibility(R.id.end_padder, View.VISIBLE); view.setViewVisibility(R.id.cancel_action, View.GONE); } return view; } public static <T extends NotificationCompatBase.Action> void overrideBigContentView(Notification n, Context context, CharSequence contentTitle, CharSequence contentText, CharSequence contentInfo, int number, Bitmap largeIcon, CharSequence subText, boolean useChronometer, long when, List<T> actions, boolean showCancelButton, PendingIntent cancelButtonIntent) { n.bigContentView = generateBigContentView(context, contentTitle, contentText, contentInfo, number, largeIcon, subText, useChronometer, when, actions, showCancelButton, cancelButtonIntent); if (showCancelButton) { n.flags |= Notification.FLAG_ONGOING_EVENT; } } private static <T extends NotificationCompatBase.Action> RemoteViews generateBigContentView(Context context, CharSequence contentTitle, CharSequence contentText, CharSequence contentInfo, int number, Bitmap largeIcon, CharSequence subText, boolean useChronometer, long when, List<T> actions, boolean showCancelButton, PendingIntent cancelButtonIntent) { final int actionCount = Math.min(actions.size(), MAX_MEDIA_BUTTONS); RemoteViews big = applyStandardTemplate(context, contentTitle, contentText, contentInfo, number, largeIcon, subText, useChronometer, when, getBigLayoutResource(actionCount), false /* fitIn1U */); big.removeAllViews(R.id.media_actions); if (actionCount > 0) { for (int i = 0; i < actionCount; i++) { final RemoteViews button = generateMediaActionButton(context, actions.get(i)); big.addView(R.id.media_actions, button); } } if (showCancelButton) { big.setViewVisibility(R.id.cancel_action, View.VISIBLE); big.setInt(R.id.cancel_action, "setAlpha", context.getResources().getInteger(R.integer.cancel_button_image_alpha)); big.setOnClickPendingIntent(R.id.cancel_action, cancelButtonIntent); } else { big.setViewVisibility(R.id.cancel_action, View.GONE); } return big; } private static RemoteViews generateMediaActionButton(Context context, NotificationCompatBase.Action action) { final boolean tombstone = (action.getActionIntent() == null); RemoteViews button = new RemoteViews(context.getPackageName(), R.layout.notification_media_action); button.setImageViewResource(R.id.action0, action.getIcon()); if (!tombstone) { button.setOnClickPendingIntent(R.id.action0, action.getActionIntent()); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) { button.setContentDescription(R.id.action0, action.getTitle()); } return button; } private static int getBigLayoutResource(int actionCount) { if (actionCount <= 3) { return R.layout.notification_template_big_media_narrow; } else { return R.layout.notification_template_big_media; } } private static RemoteViews applyStandardTemplate(Context context, CharSequence contentTitle, CharSequence contentText, CharSequence contentInfo, int number, Bitmap largeIcon, CharSequence subText, boolean useChronometer, long when, int resId, boolean fitIn1U) { RemoteViews contentView = new RemoteViews(context.getPackageName(), resId); boolean showLine3 = false; boolean showLine2 = false; // On versions before Jellybean, the large icon was shown by SystemUI, so we need to hide // it here. if (largeIcon != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { contentView.setViewVisibility(R.id.icon, View.VISIBLE); contentView.setImageViewBitmap(R.id.icon, largeIcon); } else { contentView.setViewVisibility(R.id.icon, View.GONE); } if (contentTitle != null) { contentView.setTextViewText(R.id.title, contentTitle); } if (contentText != null) { contentView.setTextViewText(R.id.text, contentText); showLine3 = true; } if (contentInfo != null) { contentView.setTextViewText(R.id.info, contentInfo); contentView.setViewVisibility(R.id.info, View.VISIBLE); showLine3 = true; } else if (number > 0) { final int tooBig = context.getResources().getInteger(R.integer.status_bar_notification_info_maxnum); if (number > tooBig) { contentView.setTextViewText(R.id.info, context.getResources().getString(R.string.status_bar_notification_info_overflow)); } else { NumberFormat f = NumberFormat.getIntegerInstance(); contentView.setTextViewText(R.id.info, f.format(number)); } contentView.setViewVisibility(R.id.info, View.VISIBLE); showLine3 = true; } else { contentView.setViewVisibility(R.id.info, View.GONE); } // Need to show three lines? Only allow on Jellybean+ if (subText != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { contentView.setTextViewText(R.id.text, subText); if (contentText != null) { contentView.setTextViewText(R.id.text2, contentText); contentView.setViewVisibility(R.id.text2, View.VISIBLE); showLine2 = true; } else { contentView.setViewVisibility(R.id.text2, View.GONE); } } // RemoteViews.setViewPadding and RemoteViews.setTextViewTextSize is not available on ICS- if (showLine2 && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { if (fitIn1U) { // need to shrink all the type to make sure everything fits final Resources res = context.getResources(); final float subTextSize = res.getDimensionPixelSize(R.dimen.notification_subtext_size); contentView.setTextViewTextSize(R.id.text, TypedValue.COMPLEX_UNIT_PX, subTextSize); } // vertical centering contentView.setViewPadding(R.id.line1, 0, 0, 0, 0); } if (when != 0) { if (useChronometer) { contentView.setViewVisibility(R.id.chronometer, View.VISIBLE); contentView.setLong(R.id.chronometer, "setBase", when + (SystemClock.elapsedRealtime() - System.currentTimeMillis())); contentView.setBoolean(R.id.chronometer, "setStarted", true); } else { contentView.setViewVisibility(R.id.time, View.VISIBLE); contentView.setLong(R.id.time, "setTime", when); } } contentView.setViewVisibility(R.id.line3, showLine3 ? View.VISIBLE : View.GONE); return contentView; } }