CameraButtonIntentReceiver.java revision 271b3095b9f763421c0547109da9de774795072d 
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 * {@code CameraButtonIntentReceiver} is invoked when the camera button is
25 * long-pressed.
26 *
27 * It is declared in {@code AndroidManifest.xml} to receive the
28 * {@code android.intent.action.CAMERA_BUTTON} intent.
29 *
30 * After making sure we can use the camera hardware, it starts the Camera
31 * activity.
32 */
33public class CameraButtonIntentReceiver extends BroadcastReceiver {
34
35    @Override
36    public void onReceive(Context context, Intent intent) {
37        // Try to get the camera hardware
38        CameraHolder holder = CameraHolder.instance();
39        if (holder.tryOpen() == null) return;
40
41        // We are going to launch the camera, so hold the camera for later use
42        holder.keep();
43        holder.release();
44        Intent i = new Intent(Intent.ACTION_MAIN);
45        i.setClass(context, Camera.class);
46        i.addCategory(Intent.CATEGORY_LAUNCHER);
47        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
48                | Intent.FLAG_ACTIVITY_CLEAR_TOP);
49        context.startActivity(i);
50    }
51}
52