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-sdk        android:minSdkVersion="13"        android:targetSdkVersion="15" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android: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;    }    @Override    public 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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