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