本文實例為大家分享了Android后臺開啟服務默默拍照的具體代碼，供大家參考，具體內容如下
最近項目原因，需要編寫一后臺運行的程序，在給定時間間隔下進行拍照，關鍵技術主要是：1、開啟服務；2、在不不預覽的情況下，進行拍照操作。3、使用AlarmManager進行定時操作。
資源清單如下：
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<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> |
服務代碼如下：
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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(); // 注冊廣播 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);// 馬上開始，每1分鐘觸發一次 } @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); // 注銷廣播 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; } } |
進行拍照存儲的操作代碼如下：
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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"); } } |
項目代碼如下：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/yangzl2008/article/details/9262505
