CameraButtonIntentReceiver.java revision 77c1cdc8f2cda250b1db842204efb49f87e094ae 
1/*
2 * Copyright (C) 2007 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.Context;
21import android.content.Intent;
22
23/**
24 * This class is used when the camera button is long-pressed.
25 *
26 * It is declared in AndroidManifest.xml to receive the
27 * {@code android.intent.action.CAMERA_BUTTON} intent.
28 *
29 * After making sure we can use the camera hardware, it starts the Camera
30 * activity.
31 */
32public class CameraButtonIntentReceiver extends BroadcastReceiver {
33
34    @Override
35    public void onReceive(Context context, Intent intent) {
36        // Try to get the camera hardware
37        CameraHolder holder = CameraHolder.instance();
38        if (holder.tryOpen() == null) return;
39
40        // We are going to launch the camera, so hold the camera for later use
41        holder.keep();
42        holder.release();
43        Intent i = new Intent(Intent.ACTION_MAIN);
44        i.setClass(context, Camera.class);
45        i.addCategory(Intent.CATEGORY_LAUNCHER);
46        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
47                | Intent.FLAG_ACTIVITY_CLEAR_TOP);
48        context.startActivity(i);
49    }
50}
51