Android开发仿扫一扫实现拍摄框内的照片功能

public class MainActivity extends AppCompatActivity {private SurfaceView surfaceview;private Camera camera;private Button take;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE); // 没有标题 必须在设置布局之前找到调用setContentView(R.layout.activity_main);/*getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, // 设置全屏显示WindowManager.LayoutParams.FLAG_FULLSCREEN);*/take = (Button)findViewById(R.id.take);surfaceview = (SurfaceView) findViewById(R.id.surfaceview);SurfaceHolder holder = surfaceview.getHolder();holder.setFixedSize(176, 155);// 设置分辨率holder.setKeepScreenOn(true);holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// SurfaceView只有当activity显示到了前台，该控件才会被创建 因此需要监听surfaceview的创建holder.addCallback(new MySurfaceCallback());//拍照按钮take.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {takepicture();}});}//点击事件@Overridepublic boolean onTouchEvent(MotionEvent event) {//对焦camera.autoFocus(new Camera.AutoFocusCallback() {@Overridepublic void onAutoFocus(boolean b, Camera camera) {camera.cancelAutoFocus();}});return super.onTouchEvent(event);}/*** 监听surfaceview的创建* @author Administrator* Surfaceview只有当activity显示到前台，该空间才会被创建*/private final class MySurfaceCallback implements SurfaceHolder.Callback {@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubtry {// 当surfaceview创建就去打开相机camera = Camera.open();Camera.Parameters params = camera.getParameters();// Log.i("i", params.flatten());params.setJpegQuality(80); // 设置照片的质量params.setPictureSize(1024, 768);params.setPreviewFrameRate(5); // 预览帧率camera.setParameters(params); // 将参数设置给相机//右旋90度，将预览调正camera.setDisplayOrientation(90);// 设置预览显示camera.setPreviewDisplay(surfaceview.getHolder());// 开启预览camera.startPreview();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stubif(camera != null){camera.release();camera = null;}}}//拍照的函数public void takepicture(){/** shutter:快门被按下* raw:相机所捕获的原始数据* jpeg:相机处理的数据*/camera.takePicture(null, null, new MyPictureCallback());}//byte转Bitmappublic Bitmap Bytes2Bimap(byte[] b) {if (b.length != 0) {return BitmapFactory.decodeByteArray(b, 0, b.length);} else {return null;}}//bitmap转bytepublic byte[] Bitmap2Bytes(Bitmap bm) {ByteArrayOutputStream baos = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.PNG, 100, baos);return baos.toByteArray();}//照片回调函数，其实是处理照片的private final class MyPictureCallback implements Camera.PictureCallback {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {// TODO Auto-generated method stubtry {Bitmap bitmap = Bytes2Bimap(data);Matrix m = new Matrix(); int width = bitmap.getWidth(); int height = bitmap.getHeight(); m.setRotate(90);//将照片右旋90度bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, m,true);Log.d("TAG","width "+width);Log.d("TAG","height "+height);//截取透明框内照片bitmap = Bitmap.createBitmap(bitmap,50,250,650,500);data = Bitmap2Bytes(bitmap);File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg");FileOutputStream fos = new FileOutputStream(file);fos.write(data);// 在拍照的时候相机是被占用的,拍照之后需要重新预览camera.startPreview();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}