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      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 
     17 package com.android.camera;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import 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  */
     33 public 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         ComboPreferences pref = new ComboPreferences(context);
     40         int cameraId = CameraSettings.readPreferredCameraId(pref);
     41         if (holder.tryOpen(null, cameraId, null) == null) {
     42             return;
     43         }
     44 
     45         // We are going to launch the camera, so hold the camera for later use
     46         holder.keep();
     47         holder.release();
     48         Intent i = new Intent(Intent.ACTION_MAIN);
     49         i.setClass(context, CameraActivity.class);
     50         i.addCategory(Intent.CATEGORY_LAUNCHER);
     51         i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
     52                 | Intent.FLAG_ACTIVITY_CLEAR_TOP);
     53         context.startActivity(i);
     54     }
     55 }
     56