| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package android.service.media; |
| |
| import android.app.Service; |
| import android.content.Intent; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.Message; |
| import android.os.Messenger; |
| |
| /** |
| * Extend this class to implement a camera prewarm service. See |
| * {@link android.provider.MediaStore#META_DATA_STILL_IMAGE_CAMERA_PREWARM_SERVICE}. |
| */ |
| public abstract class CameraPrewarmService extends Service { |
| |
| /** |
| * Intent action to bind the service as a prewarm service. |
| * @hide |
| */ |
| public static final String ACTION_PREWARM = |
| "android.service.media.CameraPrewarmService.ACTION_PREWARM"; |
| |
| /** |
| * Message sent by the client indicating that the camera intent has been fired. |
| * @hide |
| */ |
| public static final int MSG_CAMERA_FIRED = 1; |
| |
| private final Handler mHandler = new Handler() { |
| |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MSG_CAMERA_FIRED: |
| mCameraIntentFired = true; |
| break; |
| default: |
| super.handleMessage(msg); |
| } |
| } |
| }; |
| private boolean mCameraIntentFired; |
| |
| @Override |
| public IBinder onBind(Intent intent) { |
| if (ACTION_PREWARM.equals(intent.getAction())) { |
| onPrewarm(); |
| return new Messenger(mHandler).getBinder(); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean onUnbind(Intent intent) { |
| if (ACTION_PREWARM.equals(intent.getAction())) { |
| onCooldown(mCameraIntentFired); |
| } |
| return false; |
| } |
| |
| /** |
| * Called when the camera should be prewarmed. |
| */ |
| public abstract void onPrewarm(); |
| |
| /** |
| * Called when prewarm phase is done, either because the camera launch intent has been fired |
| * at this point or prewarm is no longer needed. A client should close the camera |
| * immediately in the latter case. |
| * <p> |
| * In case the camera launch intent has been fired, there is no guarantee about the ordering |
| * of these two events. Cooldown might happen either before or after the activity has been |
| * created that handles the camera intent. |
| * |
| * @param cameraIntentFired Indicates whether the intent to launch the camera has been |
| * fired. |
| */ |
| public abstract void onCooldown(boolean cameraIntentFired); |
| } |