| /* |
| * 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 com.android.cts.managedprofile; |
| |
| import android.hardware.camera2.CameraDevice; |
| import android.hardware.camera2.CameraManager; |
| import android.os.Handler; |
| import android.util.Log; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * A util class to help open camera in a blocking way. |
| */ |
| class CameraUtils { |
| |
| private static final String TAG = "CameraUtils"; |
| |
| /** |
| * @return true if success to open camera, false otherwise. |
| */ |
| public static boolean blockUntilOpenCamera(CameraManager cameraManager, Handler handler) { |
| try { |
| String[] cameraIdList = cameraManager.getCameraIdList(); |
| if (cameraIdList == null || cameraIdList.length == 0) { |
| return false; |
| } |
| String cameraId = cameraIdList[0]; |
| CameraCallback callback = new CameraCallback(); |
| cameraManager.openCamera(cameraId, callback, handler); |
| return callback.waitForResult(); |
| } catch (Exception ex) { |
| // No matter what is going wrong, it means fail to open camera. |
| ex.printStackTrace(); |
| return false; |
| } |
| } |
| |
| /** |
| * {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its state. |
| */ |
| private static class CameraCallback extends CameraDevice.StateCallback { |
| |
| private static final int OPEN_TIMEOUT_SECONDS = 5; |
| |
| private final CountDownLatch mLatch = new CountDownLatch(1); |
| |
| private AtomicBoolean mResult = new AtomicBoolean(false); |
| |
| @Override |
| public void onOpened(CameraDevice cameraDevice) { |
| Log.d(TAG, "open camera successfully"); |
| mResult.set(true); |
| if (cameraDevice != null) { |
| cameraDevice.close(); |
| } |
| mLatch.countDown(); |
| } |
| |
| @Override |
| public void onDisconnected(CameraDevice cameraDevice) { |
| Log.d(TAG, "disconnect camera"); |
| mLatch.countDown(); |
| } |
| |
| @Override |
| public void onError(CameraDevice cameraDevice, int error) { |
| Log.e(TAG, "Fail to open camera, error code = " + error); |
| mLatch.countDown(); |
| } |
| |
| public boolean waitForResult() throws InterruptedException { |
| mLatch.await(OPEN_TIMEOUT_SECONDS, TimeUnit.SECONDS); |
| return mResult.get(); |
| } |
| } |
| } |