Android后台开启服务默默拍照

最近项目原因，需要编写一后台运行的程序，在给定时间间隔下进行拍照，关键技术主要是：1、开启服务；2、在不不预览的情况下，进行拍照操作。3、使用AlarmManager进行定时操作。

资源清单如下：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.yang.testservice"android:versionCode="1"android:versionName="1.0" ><uses-feature android:name="android.hardware.camera" /><uses-feature android:name="android.hardware.camera.autofocus" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.FLASHLIGHT" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-feature android:name="android.hardware.camera.any" /><uses-sdkandroid:minSdkVersion="13"android:targetSdkVersion="15" /><applicationandroid:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name=".MainActivity"android:label="@string/title_activity_main" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><service android:name="com.yang.service.LocalService" /></application></manifest>

服务代码如下：

package com.yang.service;import java.io.IOException;import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.Camera;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.view.SurfaceView;
import android.widget.Toast;import com.yang.handle.PhotoHandler;
import com.yang.testservice.MainActivity;
import com.yang.testservice.R;public class LocalService extends Service {private AlarmManager am = null;private Camera camera;private final IBinder mBinder = new LocalBinder();private NotificationManager mNM;private int NOTIFICATION = R.string.local_service_started;/*** Class for clients to access. Because we know this service always runs in* the same process as its clients, we don't need to deal with IPC.*/public class LocalBinder extends Binder {public LocalService getService() {return LocalService.this;}}@Overridepublic void onCreate() {mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);showNotification();init();}private void init() {am = (AlarmManager) getSystemService(ALARM_SERVICE);camera = openFacingBackCamera();// 注册广播IntentFilter filter = new IntentFilter();filter.addAction("com.vegetables_source.alarm");registerReceiver(alarmReceiver, filter);Intent intent = new Intent();intent.setAction("com.vegetables_source.alarm");PendingIntent pi = PendingIntent.getBroadcast(this, 0, intent, 0);am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),1000 * 10, pi);// 马上开始，每1分钟触发一次}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.i("LocalService", "Received start id " + startId + ": " + intent);return START_STICKY;}@Overridepublic void onDestroy() {mNM.cancel(NOTIFICATION);cancelAlertManager();if (camera != null) {camera.release();camera = null;}Toast.makeText(this, R.string.local_service_stopped, Toast.LENGTH_SHORT).show();}@Overridepublic IBinder onBind(Intent intent) {return mBinder;}/*** Show a notification while this service is running.*/private void showNotification() {CharSequence text = getText(R.string.local_service_started);Notification notification = new Notification(R.drawable.stat_running,text, System.currentTimeMillis());PendingIntent contentIntent = PendingIntent.getActivity(this, 0,new Intent(this, MainActivity.class), 0);notification.setLatestEventInfo(this,getText(R.string.local_service_label), text, contentIntent);mNM.notify(NOTIFICATION, notification);}private void cancelAlertManager() {Intent intent = new Intent();intent.setAction("com.vegetables_source.alarm");PendingIntent pi = PendingIntent.getBroadcast(this, 0, intent, 0);am.cancel(pi);// 注销广播unregisterReceiver(alarmReceiver);}BroadcastReceiver alarmReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {if ("com.vegetables_source.alarm".equals(intent.getAction())) {if (camera != null) {SurfaceView dummy = new SurfaceView(getBaseContext());try {camera.setPreviewDisplay(dummy.getHolder());} catch (IOException e) {e.printStackTrace();}camera.startPreview();camera.takePicture(null, null, new PhotoHandler(getApplicationContext()));}}}};private Camera openFacingBackCamera() {Camera cam = null;Camera.CameraInfo cameraInfo = new Camera.CameraInfo();;for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx++) {Camera.getCameraInfo(camIdx, cameraInfo);if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {try {cam = Camera.open(camIdx);} catch (RuntimeException e) {e.printStackTrace();}}}return cam;}
}

进行拍照存储的操作代码如下：

package com.yang.handle;import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Environment;
import android.widget.Toast;public class PhotoHandler implements PictureCallback {private final Context context;public PhotoHandler(Context context) {this.context = context;}@Overridepublic void onPictureTaken(byte[] data, Camera camera) {File pictureFileDir = getDir();if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {Toast.makeText(context, "Can't create directory to save image.",Toast.LENGTH_LONG).show();return;}SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");String date = dateFormat.format(new Date());String photoFile = "Picture_" + date + ".jpg";String filename = pictureFileDir.getPath() + File.separator + photoFile;File pictureFile = new File(filename);System.out.println("filename is "+ filename);try {FileOutputStream fos = new FileOutputStream(pictureFile);fos.write(data);fos.close();Toast.makeText(context, "New Image saved:" + photoFile,Toast.LENGTH_LONG).show();} catch (Exception error) {Toast.makeText(context, "Image could not be saved.",Toast.LENGTH_LONG).show();}}private File getDir() {File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);return new File(sdDir, "ServiceCamera");}
}

项目代码如下：

http://download.csdn.net/detail/yangzl2008/5714383

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