Android开发片段–调用系统相机拍照

初始化相机

 

private void initCamera() {
		setContentView(R.layout.main);
		btnTake = (Button) this.findViewById(R.id.take);

		btnTake.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				camera.autoFocus(new AutoFocusCallback());
			}
		});
		Display display = getWindowManager().getDefaultDisplay();
		surfaceView = (SurfaceView) this.findViewById(R.id.mSurfaceView1);
		surfaceView.getHolder().setFixedSize(display.getWidth(),
				display.getHeight()); // 设置分辨率
		/* 下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 */
		surfaceView.getHolder()
				.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		surfaceView.getHolder().addCallback(new SurfaceCallback());
	}

 

回调函数类

 private final class SurfaceCallback implements SurfaceHolder.Callback {

		@Override
		public void surfaceChanged(SurfaceHolder holder, int format, int width,
				int height) {

		}

		@Override
		public void surfaceCreated(SurfaceHolder holder) {
			try {
				camera = Camera.open();
				Camera.Parameters parameters = camera.getParameters();
				// parameters.setPreviewSize(1024, 768);//设置预览照片的大小
				// parameters.setPreviewFrameRate(3);//每秒3帧
				parameters.setPictureFormat(PixelFormat.JPEG);// 设置照片的输出格式
				parameters.set("jpeg-quality", quality);// 照片质量
				parameters.setPictureSize(photoWidth, photoHeight);// 设置照片的大小
				parameters.set("orientation", "landscape");
				// parameters.set("orientation", "portrait");
				// parameters.set("rientation", "90");
				// camera.setDisplayOrientation(90);
				// parameters.set("rotation", "180");
				// parameters.set("orientation", "landscape");
				parameters.setRotation(180);

				camera.setParameters(parameters);
				camera.setPreviewDisplay(surfaceView.getHolder());// 通过SurfaceView显示取景画面
				camera.startPreview();// 开始预览
				preview = true;
			} catch (IOException e) {
				Log.e(TAG, e.toString());
			}

		}

		@Override
		public void surfaceDestroyed(SurfaceHolder holder) {
			if (camera != null) {
				if (preview)
					camera.stopPreview();
				camera.release();
			}
		}

	}

 自动对焦

private final class AutoFocusCallback implements Camera.AutoFocusCallback {
		@Override
		public void onAutoFocus(boolean success, Camera camera) {
			camera.takePicture(null, null, new TakePictureCallback());
		}

	}

 拍照保存

private final class TakePictureCallback implements PictureCallback {
		@Override
		public void onPictureTaken(byte[] data, Camera camera) {
			try {

				Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
						data.length);
				File file = new File(temPath);
				FileOutputStream outStream = new FileOutputStream(file);

				// Bitmap 旋转
				Matrix vMatrix = new Matrix();
				vMatrix.setRotate(270);

				Bitmap vB2 = Bitmap.createBitmap(bitmap, 0, 0, bitmap
						.getWidth() // 宽度
						, bitmap.getHeight() // 高度
						, vMatrix, true);
				vB2.compress(CompressFormat.JPEG, 100, outStream);
				outStream.close();
				camera.stopPreview();
				// savePhoto();
				setReview();
			} catch (Exception e) {
				Log.e(TAG, e.toString());
			}
		}
	}