android调用摄像头偷拍demo 无声 无预览 一件拍照存储

结合精简并优化了一下常用的拍照方法，实现了无预览拍照，下面是一个工具类

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;


import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.media.AudioManager;
import android.os.Build;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.SurfaceHolder.Callback;


import com.cn.zongyi.safebox.Constants;
import com.cn.zongyi.safebox.MyApplication;
import com.cn.zongyi.safebox.ui.NewBuildSafeBoxActivity;
import com.cn.zongyi.safebox.ui.R;


public class CameraUtil {
	
	private SurfaceView sView; //画布视图
	private SurfaceHolder surfaceHolder; //画布Holder
	public Camera camera; // 定义系统所用的照相机
	private boolean isPreview = false;// 是否在浏览中
	private AudioManager manager; //声音管理
	private int volumn; //声音值
	private String picPath = "";
	private NewBuildSafeBoxActivity context;


	public CameraUtil(Context context) {
		this.context = (NewBuildSafeBoxActivity) context;
	}


	@SuppressWarnings("deprecation")
	public void initCameraFirst() {
		manager = (AudioManager) context
				.getSystemService(Context.AUDIO_SERVICE);
		manager.setStreamMute(AudioManager.STREAM_SYSTEM, false);
		volumn = manager.getStreamVolume(AudioManager.STREAM_SYSTEM);
		if (volumn != 0) {
			// 如果需要静音并且当前未静音（muteMode的设置可以放在Preference中）
			manager.setStreamVolume(AudioManager.STREAM_SYSTEM, 0,
					AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
		}
		sView = (SurfaceView) ((Activity) context).findViewById(R.id.sView);


		if (MyApplication.invadeMonitor()) {
			// 获得SurfaceView的SurfaceHolder
			surfaceHolder = sView.getHolder();
			// 为surfaceHolder添加一个回调监听器
			surfaceHolder.addCallback(new Callback() {
				public void surfaceChanged(SurfaceHolder holder, int format,
						int width, int height) {
				}


				public void surfaceCreated(SurfaceHolder holder) {
					// surface被创建时打开摄像头
					initCamera();


				}


				// surface摧毁时释放摄像头
				public void surfaceDestroyed(SurfaceHolder holder) {
					// 如果camera不为null ,释放摄像头
					if (camera != null) {
						// 7.结束程序时，调用Camera的StopPriview()结束取景预览，并调用release()方法释放资源.
						if (isPreview)
							camera.stopPreview();
						camera.release();
						camera = null;
					}
				}
			});
			// 设置该SurfaceView自己不维护缓冲
			surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		}
	}


	@TargetApi(Build.VERSION_CODES.GINGERBREAD)
	@SuppressLint("NewApi")
	private void initCamera() {
		if (!isPreview) {
			int cameraCount = 0;
			Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
			cameraCount = Camera.getNumberOfCameras(); // get cameras number
			
			if (cameraCount == 1) {
				// camera = Camera.open();// 调用Camera的open()方法打开相机。
				Log.e("TAG", "无前置摄像头");
			} else {
				Log.e("TAG", "__________4");
				for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
					Camera.getCameraInfo(camIdx, cameraInfo); // get camerainfo
					if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { // 代表摄像头的方位，目前有定义值两个分别为CAMERA_FACING_FRONT前置和CAMERA_FACING_BACK后置
						try {
							camera = Camera.open(camIdx);// 调用Camera的open()方法打开相机。
						} catch (RuntimeException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}
		if (camera != null && !isPreview) {
			try {
				camera.setPreviewDisplay(surfaceHolder);
			} catch (IOException e) {
				e.printStackTrace();
			}
			// 开始预览
			camera.startPreview();
			isPreview = true;
		}
	}


	public PictureCallback myjpegCallback = new PictureCallback() {


		@SuppressLint("SimpleDateFormat")
		public void onPictureTaken(byte[] data, Camera camera) {
			Log.e("TAG", "拍照成功");
			// 重置声音
			manager.setStreamVolume(AudioManager.STREAM_SYSTEM, volumn,
					AudioManager.FLAG_ALLOW_RINGER_MODES);
			// 根据拍照所得的数据创建位图
			final Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
					data.length);
			if (ExistSDCard()) {


				picPath = Constants.HEAD_PIC_PATH
						+ new SimpleDateFormat("yyyyMMdd_HHmmss")
								.format(new Date()) + ".jpg";


				File file = new File(picPath);
				FileOutputStream outStream = null;
				try {
					// 打开指定文件对应的输出流
					outStream = new FileOutputStream(file);
					// 把位图输出到指定文件中
					Matrix matrix = new Matrix();
					Bitmap bm = Bitmap.createBitmap(1200,
							1200 * bitmap.getHeight() / bitmap.getWidth(),
							Config.ARGB_8888);// 固定所拍相片大小
					matrix.setScale(
							(float) bm.getWidth() / (float) bitmap.getWidth(),
							(float) bm.getHeight() / (float) bitmap.getHeight());// 注意参数一定是float哦
					Canvas canvas = new Canvas(bm);// 用bm创建一个画布
													// 可以往bm中画入东西了
					canvas.drawBitmap(bitmap, matrix, null);
					bm.compress(CompressFormat.JPEG, 40, outStream);
					outStream.close();


				} catch (IOException e) {
					e.printStackTrace();
				}
			} else {
				Log.e("TAG", "SD卡不可用");
			}


			camera.stopPreview();
			camera.startPreview();
			isPreview = true;
			MyApplication.getInstance().setUser_pic_path(picPath);


			context.cameraRefresh(picPath);


		}
	};


	public static boolean ExistSDCard() {
		if (android.os.Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED)) {
			return true;
		} else
			return false;
	}
}

布局文件看一下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/new_build_resize_layout"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="match_parent" >



<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
tools:ignore="UselessParent" >



<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="50dp">

<SurfaceView
android:id="@+id/sView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"/>

</RelativeLayout>


<EditText
android:id="@+id/et_pwd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="@string/please_enter_a_password"
android:inputType="number"
android:maxLength="@integer/edit_length"
android:password="true"
tools:ignore="Deprecated" >


<requestFocus />
</EditText>


<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >


<CheckBox
android:id="@+id/ckb_show_pwd"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/show_pwd" />
</LinearLayout>
</LinearLayout>


<LinearLayout
android:id="@+id/next_step_linear"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp" >


<Button
android:id="@+id/next_step"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/new_build_safe_box_new_step_button" />
</LinearLayout>


</RelativeLayout>