安卓相机

关键技术：

SurfaceHolder.Callback

public class MyCameraDemo extends Activity {	private SurfaceView surface = null ;	private Button but = null ;	private SurfaceHolder holder = null ;	private Camera cam = null ;	private boolean previewRunning =  true ;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		super.setContentView(R.layout.main);		this.but = (Button) super.findViewById(R.id.but) ;		this.surface = (SurfaceView) super.findViewById(R.id.surface) ;				this.holder = this.surface.getHolder() ;		this.holder.addCallback(new MySurfaceViewCallback()) ;		//设置缓冲类型		this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS) ;		//设置分辨率		this.holder.setFixedSize(600, 350);				this.but.setOnClickListener(new OnClickListenerImpl()) ;	}	private class OnClickListenerImpl implements OnClickListener {		@Override		public void onClick(View v) {			if(MyCameraDemo.this.cam != null) {				//自动对焦				MyCameraDemo.this.cam.autoFocus(new AutoFocusCallbackImpl()) ;			}		}			}		private class MySurfaceViewCallback implements SurfaceHolder.Callback {		//当预览界面格式大小改变时，调用		public void surfaceChanged(SurfaceHolder holder, int format, int width,				int height) {					}		//初次实例化界面调用		public void surfaceCreated(SurfaceHolder holder) {			MyCameraDemo.this.cam = Camera.open(0) ;	// 取得第一个摄像头			//窗口服务			WindowManager manager = (WindowManager) MyCameraDemo.this					.getSystemService(Context.WINDOW_SERVICE);			//取得display显示对象			Display display = manager.getDefaultDisplay() ;			//照相机参数			Parameters param = MyCameraDemo.this.cam.getParameters() ;			//将照相机预览大小设置为display大小			param.setPreviewSize(display.getWidth(), display.getHeight()) ;			param.setPreviewFrameRate(5) ;	// 一秒5帧			param.setPictureFormat(PixelFormat.JPEG) ;	// 图片形式			param.set("jpen-quality", 80) ;//图片质量，最高100			MyCameraDemo.this.cam.setParameters(param) ;			try {				MyCameraDemo.this.cam.setPreviewDisplay(MyCameraDemo.this.holder) ;			} catch (IOException e) {			}			MyCameraDemo.this.cam.startPreview() ;	// 进行预览			MyCameraDemo.this.previewRunning = true ;	// 已经开始预览		}		@Override		public void surfaceDestroyed(SurfaceHolder holder) {			if(MyCameraDemo.this.cam != null) {				if(MyCameraDemo.this.previewRunning) {					MyCameraDemo.this.cam.stopPreview() ;	// 停止预览					MyCameraDemo.this.previewRunning = false ;				}				MyCameraDemo.this.cam.release() ;			}		}			}		private class AutoFocusCallbackImpl implements AutoFocusCallback {		@Override		public void onAutoFocus(boolean success, Camera camera) {			if(success) {	// 成功				MyCameraDemo.this.cam.takePicture(sc, pc, jpgcall) ;			}		}			}		private PictureCallback jpgcall = new PictureCallback() {		@Override		public void onPictureTaken(byte[] data, Camera camera) {	// 保存图片的操作			Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);			String fileName = Environment.getExternalStorageDirectory()					.toString()					+ File.separator					+ "mldnphoto"					+ File.separator					+ "MLDN_" + System.currentTimeMillis() + ".jpg";			File file = new File(fileName) ;			if (!file.getParentFile().exists()) {				file.getParentFile().mkdirs() ;	// 创建文件夹			}			try {				BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file)) ;				bmp.compress(Bitmap.CompressFormat.JPEG, 80, bos) ; // 向缓冲区之中压缩图片				bos.flush() ;				bos.close() ;				Toast.makeText(MyCameraDemo.this,						"拍照成功，照片已保存在" + fileName + "文件之中！", Toast.LENGTH_SHORT)						.show();			} catch (Exception e) {				Toast.makeText(MyCameraDemo.this,						"拍照失败！", Toast.LENGTH_SHORT)						.show();			}			MyCameraDemo.this.cam.stopPreview() ;			MyCameraDemo.this.cam.startPreview() ;		}			} ;		private ShutterCallback sc = new ShutterCallback(){		@Override		public void onShutter() {			// 按下快门之后进行的操作		}	} ;	private PictureCallback pc = new PictureCallback() {		@Override		public void onPictureTaken(byte[] data, Camera camera) {					}			} ;}

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主布局函数

<?xml version="1.0" encoding="utf-8"?><LinearLayout 	xmlns:android="http://schemas.android.com/apk/res/android"	android:orientation="vertical" 	android:layout_width="fill_parent"	android:layout_height="fill_parent">	<Button		android:id="@+id/but" 		android:layout_width="fill_parent"		android:layout_height="wrap_content" 		android:text="照相" />	<SurfaceView		android:id="@+id/surface"		android:layout_width="fill_parent"		android:layout_height="fill_parent" /> </LinearLayout>

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