Android使用摄像头拍照

//main.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

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

</LinearLayout>




//MainActivity如下:
package com.bravesoft;
import java.io.File;
import java.io.FileOutputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.view.Display;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
/**
 * 注意权限
 *  <uses-permission android:name="android.permission.CAMERA"/>
   <!-- 在SDCard中创建与删除文件权限 -->
   <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
   <!-- 往SDCard写入数据权限 -->
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 * @author Administrator
 *
 */
public class TestCameraActivity extends Activity {
	private SurfaceView surfaceView;
	private Camera camera;
	private boolean isPriview;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 去掉标题栏
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		// 全屏幕显示
		getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);// 全屏幕显示
		setContentView(R.layout.main);
		surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
		surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		surfaceView.getHolder().setFixedSize(176, 144);// 设置分辨率
		surfaceView.getHolder().addCallback(new SurfaceHolderCallbackImpl());// SurfaceView的回调
	}

	class SurfaceHolderCallbackImpl implements SurfaceHolder.Callback {
		@Override
		public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}

		@Override
		public void surfaceCreated(SurfaceHolder holder) {
			WindowManager windowManager = (WindowManager) TestCameraActivity.this.getSystemService(WINDOW_SERVICE);
			Display display = windowManager.getDefaultDisplay();
			camera = Camera.open();// 打开摄像头
			Parameters params = camera.getParameters();
			params.setPreviewSize(display.getWidth(), display.getHeight());// 设置预览照片的大小
			params.setPreviewFrameRate(5);// 摄像头每秒捕获的照片数量.此为每秒钟5个画面
			params.setPictureFormat(PixelFormat.JPEG);// 设置照片的输出格式
			params.set("jpeg-quality", 85);// 设置照片质量
			params.setPictureSize(display.getWidth(), display.getHeight());// 设置照片的大小

			try {
				camera.setParameters(params);// 摄像头设置参数
				camera.setPreviewDisplay(holder);// 设置摄像头使用的SurfaceView
				camera.startPreview();// 摄像头开启预览
				isPriview = true;
			} catch (Exception e) {
				e.printStackTrace();
			}

		}

		@Override
		public void surfaceDestroyed(SurfaceHolder holder) {
			if (camera != null) {
				if (isPriview) {// 如果在预览
					camera.stopPreview();// 停止预览
					isPriview = false;
				}
				camera.release();// 释放掉摄像头
			}
		}
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {// 重写Activity的方法
		if (camera != null && event.getRepeatCount() == 0) {// event.getRepeatCount()按键的重复次数.重复次数=0,表示只按了一下
			switch (keyCode) {
			// case KeyEvent.KEYCODE_SEARCH://搜索按键
			// camera.autoFocus(null);//自动对焦.此为自动对焦的回调方法.可以为空
			// return true;
			case KeyEvent.KEYCODE_CAMERA:// 拍照键
			case KeyEvent.KEYCODE_SEARCH:// SEARCH键.按下这两个键的时候执行拍照
				camera.takePicture(null, null, null, new PictureCallbackImpl());// 拍照.且拍照后调用TakePictureCallback回调函数来处理照片
				return true;
			}
		}
		return super.onKeyDown(keyCode, event);
	}

	class PictureCallbackImpl implements PictureCallback {// 拍照后的回调处理
		@Override
		public void onPictureTaken(byte[] data, Camera camera) {
			Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
			File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis() + ".jpg");
			try {
				FileOutputStream outputStream = new FileOutputStream(file);
				bitmap.compress(CompressFormat.JPEG, 100, outputStream);// 100是无损压缩
				outputStream.close();
				camera.startPreview();// 拍照后,摄像头再次开始预览.否则出现屏幕不动的情况
			} catch (Exception e) {
				e.printStackTrace();
			}

		}
	}
}