相机具备自拍功能

    private MyAutoFocus mAutoFocus = new MyAutoFocus();
    //自动对焦方法
    class MyAutoFocus implements AutoFocusCallback{
        @SuppressLint("NewApi")
        public void onAutoFocus(boolean success, Camera camera) {
            if(mCamera.getParameters().getFocusAreas() != null)
                for(Area a: mCamera.getParameters().getFocusAreas())
                    Log.e("wangshuo","bottom is "+a.rect.bottom+"; top is "+a.rect.top+"; left is "+a.rect.left+"; right is "+a.rect.right);
            focusImage.setImageResource(R.drawable.focus_focusing);
            focusImage.setVisibilit