博客

mCamera.autoFocus(mAutoFocusCallBack);

自动对焦回调函数mAutoFocusCallBack

private AutoFocusCallback mAutoFocusCallBack = new AutoFocusCallback() {

	@Override
	public void onAutoFocus(boolean success, Camera camera) {

		if (success) {

			mInProgress = true;

			// set parameters of camera
			Camera.Parameters Parameters = mCamera.getParameters();
			Parameters.setPreviewSize(IMG_PREVIEW_WIDTH, IMG_PREVIEW_HEIGHT);
			Parameters.setPictureSize(IMG_WIDTH, IMG_HEIGHT);
			mCamera.setParameters(Parameters);

			mCamera.takePicture(mShutterListener, null, mImageCaptureCallback);
		}
	}
};

设置Camera.Parameters好像有些问题，如果设置了相机（或者是SDK）不支持的分辨率就会报错，估计要添加判断。

目前的设置为

private static int IMG_PREVIEW_WIDTH = 480;
private static int IMG_PREVIEW_HEIGHT = 320;
private static int IMG_WIDTH = 1280;
private static int IMG_HEIGHT = 960;

监听事件mShutterListener

private Camera.ShutterCallback mShutterListener = new Camera.ShutterCallback() {
	public void onShutter() {
	}
};

拍照回调函数mImageCaptureCallback

这里使用了线程，因为考虑到保存图片时一般都会显示一个progress dialog，如果不用线程的话，dialog画面会定在那里，无法起到预期的效果。

当然不用线程也不会有错，适当修改一下就可以了。

private PictureCallback mImageCaptureCallback = new PictureCallback() {

	@Override
	public void onPictureTaken(final byte[] data, Camera camera) {

		new Thread(new Runnable() {

			@Override
			public void run() {

				// get path to save image file
				String filePath = "/sdcard/DCIM/Camera";

				// generate file name
				String name = "mytest.jpg";
				String fileName = filePath + name;

				FileOutputStream fos = null;
				try {
					// saving file
					fos = new FileOutputStream(fileName);
					fos.write(data);
					fos.close();

				} catch (Exception e) {

					// close file if error
					if (fos != null) {
						try {
							fos.close();
						} catch (IOException e1) {
							e1.printStackTrace();
						}
						try {
							throw e;
						} catch (Exception e1) {
							e1.printStackTrace();
						}
					}
					// close scene
					finish();
				}
			}
		}).start();
	}
};

最后提醒一下，别忘记在AndroidManifest.xml里增加

<uses-permission android:name="android.permission.CAMERA" />

好了，就写那么多吧，希望对大家有用。