android如何实现后台拍照

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（1）CameraActivity.java

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package com.camera.test;   import android.app.Activity; import android.content.pm.ActivityInfo; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; import android.widget.RelativeLayout;   public class CameraActivity extends Activity {     private CameraView view;     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);           getWindow().clearFlags(                 WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);         getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);         requestWindowFeature(Window.FEATURE_NO_TITLE);// 设置横屏模式以及全屏模式           view = new CameraView(this);// 通过一个surfaceview的view来实现拍照         view.setId(1);         view = new CameraView(this, this);         setContentView(R.layout.camera_layout);         RelativeLayout relative = (RelativeLayout) this.findViewById(R.id.ly);         RelativeLayout.LayoutParams Layout = new RelativeLayout.LayoutParams(3, 3);// 设置surfaceview使其满足需求无法观看预览         Layout.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, 1);         Layout.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, 1);           relative.addView(view, Layout);       }   }       （2） CameraView.java   package com.camera.test;   import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Point; import android.graphics.PointF; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.ShutterCallback; import android.media.AudioManager; import android.media.FaceDetector; import android.media.FaceDetector.Face; import android.os.Environment; import android.os.Handler;   import android.view.SurfaceHolder; import android.view.SurfaceView; import android.widget.Toast;   public class CameraView extends SurfaceView implements SurfaceHolder.Callback,         Camera.PictureCallback {       private SurfaceHolder holder;     private Camera camera;     private Camera.Parameters parameters;     private Activity act;     private Handler handler = new Handler();     private Context context;     private SurfaceView surfaceView;     private AudioManager audio;     private int current;       public CameraView(Context context) {         super(context);           surfaceView = this;         audio = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);         final int current = audio.getRingerMode();         audio.setRingerMode(AudioManager.RINGER_MODE_SILENT);         this.context = context;         holder = getHolder();// 生成Surface Holder         holder.addCallback(this);         holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 指定Push Buffer           handler.postDelayed(new Runnable() {               @Override             public void run() {                 if (camera == null) {                     handler.postDelayed(this, 1 * 1000);// 由于启动camera需要时间，在此让其等两秒再进行聚焦知道camera不为空                 } else {                     camera.autoFocus(new AutoFocusCallback() {                         @Override                         public void onAutoFocus(boolean success, Camera camera) {                             if (success) {                                 camera.takePicture(new ShutterCallback() {// 如果聚焦成功则进行拍照                                             @Override                                             public void onShutter() {                                             }                                         }, null, CameraView.this);                             } else {                             }                         }                     });                 }             }         }, 2 * 1000);     }       public CameraView(Context context, Activity act) {// 在此定义一个构造方法用于拍照过后把CameraActivity给finish掉         this(context);         this.act = act;     }       @Override     public void surfaceCreated(final SurfaceHolder holder) {         // TODO Auto-generated method stub           camera = Camera.open();// 摄像头的初始化         handler.postDelayed(new Runnable() {               @Override             public void run() {                 if (holder != null) {                     try {                         camera.setPreviewDisplay(holder);                     } catch (IOException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                 } else {                     handler.postDelayed(this, 1 * 1000);                 }             }         }, 2 * 1000);     }       @Override     public void surfaceChanged(SurfaceHolder holder, int format, int width,             int height) {         // TODO Auto-generated method stub           parameters = camera.getParameters();         camera.setParameters(parameters);// 设置参数         camera.startPreview();// 开始预览     }       @Override     public void surfaceDestroyed(SurfaceHolder holder) {         // TODO Auto-generated method stub       }       public void onPictureTaken(byte[] data, Camera camera) {// 拍摄完成后保存照片           try {               Date date = new Date();             SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");             String time = format.format(date);               //在SD卡上创建文件夹             File file = new File(Environment.getExternalStorageDirectory()                     + "/myCamera/pic");             if (!file.exists()) {                   file.mkdirs();             }               String path = Environment.getExternalStorageDirectory()                     + "/myCamera/pic/" + time + ".jpg";             data2file(data, path);             camera.setPreviewCallback(null);             camera.stopPreview();             camera.release();             camera = null;             holder.removeCallback(CameraView.this);             audio.setRingerMode(current);             act.finish();             //uploadFile(path);           } catch (Exception e) {           }       }       private void data2file(byte[] w, String fileName) throws Exception {// 将二进制数据转换为文件的函数         FileOutputStream out = null;         try {             out = new FileOutputStream(fileName);             out.write(w);             out.close();         } catch (Exception e) {             if (out != null)                 out.close();             throw e;         }     } //  private void uploadFile(String filePath)// 拍照过后上传文件到服务器 //  { //  }   }   （3）camera_layout.xml   <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/ly"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >       </RelativeLayout>