这篇文章主要介绍Android如何实现后台开启服务默默拍照功能，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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具体内容如下
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：
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;
}
}
@Override
public 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
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService", "Received start id " + startId + ": " + intent);
return START_STICKY;
}
@Override
public 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();
}
@Override
public 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() {
@Override
public 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：
Android后台开启服务默默拍照
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