1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.settings.flashlight;
18 
19 import static android.app.slice.Slice.EXTRA_TOGGLE_STATE;
20 
21 import static androidx.slice.builders.ListBuilder.ICON_IMAGE;
22 
23 import android.annotation.ColorInt;
24 import android.app.PendingIntent;
25 import android.content.Context;
26 import android.content.Intent;
27 import android.content.IntentFilter;
28 import android.hardware.camera2.CameraAccessException;
29 import android.hardware.camera2.CameraCharacteristics;
30 import android.hardware.camera2.CameraManager;
31 import android.net.Uri;
32 import android.provider.Settings;
33 import android.provider.Settings.Secure;
34 import android.util.Log;
35 
36 import androidx.core.graphics.drawable.IconCompat;
37 import androidx.slice.Slice;
38 import androidx.slice.builders.ListBuilder;
39 import androidx.slice.builders.ListBuilder.RowBuilder;
40 import androidx.slice.builders.SliceAction;
41 
42 import com.android.internal.annotations.VisibleForTesting;
43 import com.android.settings.R;
44 import com.android.settings.Utils;
45 import com.android.settings.slices.CustomSliceRegistry;
46 import com.android.settings.slices.CustomSliceable;
47 
48 
49 /**
50  * Utility class to build a Flashlight Slice, and handle all associated actions.
51  */
52 public class FlashlightSlice implements CustomSliceable {
53 
54     private static final String TAG = "FlashlightSlice";
55 
56     /**
57      * Action broadcasting a change on whether flashlight is on or off.
58      */
59     private static final String ACTION_FLASHLIGHT_CHANGED =
60             "com.android.settings.flashlight.action.FLASHLIGHT_CHANGED";
61 
62     private final Context mContext;
63 
FlashlightSlice(Context context)64     public FlashlightSlice(Context context) {
65         mContext = context;
66     }
67 
68     @Override
getSlice()69     public Slice getSlice() {
70         if (!isFlashlightAvailable(mContext)) {
71             return null;
72         }
73         final PendingIntent toggleAction = getBroadcastIntent(mContext);
74         @ColorInt final int color = Utils.getColorAccentDefaultColor(mContext);
75         final IconCompat icon =
76                 IconCompat.createWithResource(mContext, R.drawable.ic_signal_flashlight);
77         return new ListBuilder(mContext, CustomSliceRegistry.FLASHLIGHT_SLICE_URI,
78                 ListBuilder.INFINITY)
79                 .setAccentColor(color)
80                 .addRow(new RowBuilder()
81                         .setTitle(mContext.getText(R.string.power_flashlight))
82                         .setTitleItem(icon, ICON_IMAGE)
83                         .setPrimaryAction(
84                                 SliceAction.createToggle(toggleAction, null,
85                                         isFlashlightEnabled(mContext))))
86                 .build();
87     }
88 
89     @Override
getUri()90     public Uri getUri() {
91         return CustomSliceRegistry.FLASHLIGHT_SLICE_URI;
92     }
93 
94     @Override
getIntentFilter()95     public IntentFilter getIntentFilter() {
96         return new IntentFilter(ACTION_FLASHLIGHT_CHANGED);
97     }
98 
99     @Override
onNotifyChange(Intent intent)100     public void onNotifyChange(Intent intent) {
101         try {
102             final String cameraId = getCameraId(mContext);
103             if (cameraId != null) {
104                 final boolean state = intent.getBooleanExtra(
105                         EXTRA_TOGGLE_STATE, isFlashlightEnabled(mContext));
106                 final CameraManager cameraManager = mContext.getSystemService(CameraManager.class);
107                 cameraManager.setTorchMode(cameraId, state);
108             }
109         } catch (CameraAccessException e) {
110             Log.e(TAG, "Camera couldn't set torch mode.", e);
111         }
112         mContext.getContentResolver().notifyChange(CustomSliceRegistry.FLASHLIGHT_SLICE_URI, null);
113     }
114 
115     @Override
getIntent()116     public Intent getIntent() {
117         return null;
118     }
119 
120     @Override
getSliceHighlightMenuRes()121     public int getSliceHighlightMenuRes() {
122         // no landing page in Settings
123         return NO_RES;
124     }
125 
getCameraId(Context context)126     private static String getCameraId(Context context) throws CameraAccessException {
127         final CameraManager cameraManager = context.getSystemService(CameraManager.class);
128         final String[] ids = cameraManager.getCameraIdList();
129         for (String id : ids) {
130             CameraCharacteristics c = cameraManager.getCameraCharacteristics(id);
131             Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
132             Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
133             if (flashAvailable != null && flashAvailable
134                     && lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
135                 return id;
136             }
137         }
138         return null;
139     }
140 
141     @VisibleForTesting
isFlashlightAvailable(Context context)142     static boolean isFlashlightAvailable(Context context) {
143         int defaultAvailability = 0;
144         try {
145             // check if there is a flash unit
146             if (getCameraId(context) != null) {
147                 defaultAvailability = 1;
148             }
149         } catch (CameraAccessException e) {
150             Log.e(TAG, "Error getting camera id.", e);
151         }
152         return Secure.getInt(context.getContentResolver(),
153                 Secure.FLASHLIGHT_AVAILABLE, defaultAvailability) == 1;
154     }
155 
isFlashlightEnabled(Context context)156     private static boolean isFlashlightEnabled(Context context) {
157         return Settings.Secure.getInt(
158                 context.getContentResolver(), Secure.FLASHLIGHT_ENABLED, 0) == 1;
159     }
160 }
161