DisableCameraReceiver.java revision dbf0c4f2fbf366f764f421f70605205440c07fa2 
1/*
2 * Copyright (C) 2012 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
17package com.android.camera;
18
19import android.content.BroadcastReceiver;
20import android.content.ComponentName;
21import android.content.Context;
22import android.content.Intent;
23import android.content.pm.PackageManager;
24import android.hardware.Camera.CameraInfo;
25import android.util.Log;
26
27// We want to disable camera-related activities if there is no camera. This
28// receiver runs when BOOT_COMPLETED intent is received. After running once
29// this receiver will be disabled, so it will not run again.
30public class DisableCameraReceiver extends BroadcastReceiver {
31    private static final String TAG = "DisableCameraReceiver";
32    private static final boolean CHECK_BACK_CAMERA_ONLY = true;
33    private static final Class ACTIVITIES[] = {
34        com.android.camera.Camera.class,
35        com.android.camera.VideoCamera.class,
36        com.android.camera.PanoramaActivity.class,
37    };
38
39    @Override
40    public void onReceive(Context context, Intent intent) {
41        // Disable camera-related activities if there is no camera.
42        boolean needCameraActivity = CHECK_BACK_CAMERA_ONLY
43            ? hasBackCamera()
44            : hasCamera();
45
46        if (!needCameraActivity) {
47            Log.i(TAG, "disable all camera activities");
48            for (int i = 0; i < ACTIVITIES.length; i++) {
49                disableComponent(context, ACTIVITIES[i]);
50            }
51        }
52
53        // Disable this receiver so it won't run again.
54        disableComponent(context, DisableCameraReceiver.class);
55    }
56
57    private boolean hasCamera() {
58        int n = android.hardware.Camera.getNumberOfCameras();
59        Log.i(TAG, "number of camera: " + n);
60        return (n > 0);
61    }
62
63    private boolean hasBackCamera() {
64        int n = android.hardware.Camera.getNumberOfCameras();
65        CameraInfo info = new CameraInfo();
66        for (int i = 0; i < n; i++) {
67            android.hardware.Camera.getCameraInfo(i, info);
68            if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
69                Log.i(TAG, "back camera found: " + i);
70                return true;
71            }
72        }
73        Log.i(TAG, "no back camera");
74        return false;
75    }
76
77    private void disableComponent(Context context, Class klass) {
78        ComponentName name = new ComponentName(context, klass);
79        PackageManager pm = context.getPackageManager();
80
81        // We need the DONT_KILL_APP flag, otherwise we will be killed
82        // immediately because we are in the same app.
83        pm.setComponentEnabledSetting(name,
84            PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
85            PackageManager.DONT_KILL_APP);
86    }
87}
88