[Android] Using camera to capture pictures.

To prepare the surface:
  this.surface = (SurfaceView)findViewById(R.id.yourSurface);
  this.surfaceHolder = this.surface.getHolder();
  this.surfaceHolder.addCallback(this);
  this.surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

To start the camera:
  this.camera = Camera.open()
  this.camera.setPreviewDisplay(this.surfaceHolder);
  Camera.parameters parameters = this.camera.getParameters();
  parameters.getPreviewSize(x, y);
  this.camera.startPreview();

To reset or pause the camera:
  this.camera.stopPreview();
  this.camera.release();

To take a picture:
  this.camera.takePicture(shutterCallback, rawCallback, jpegCallback);

To check SD card inside:
  android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);

To save picture:
  Bitmap bm = BitmapFactory.decodeByteArray(_data, 0, _data.length);
  File myCaptureFile = new File(strCaptureFilePath);
  BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
  bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
  bos.flush();
  bos.close();

[Linux] VirtualBox里debian的分辨率修改

之前使用VirtualBox安装debian，发现没有办法改分辨率，很难受。
经过查找，找到了x-windows修改分辨率的方法： 

使用gtf 1280 800 60得到要修改的代码，修改/etc/X11/xorg.conf如下： 

Section "Monitor" 
Identifier "Configured Monitor"
Option "DPMS"
Modeline "1280x800_60.00" 83.46 1280 1344 1480 1680 800 801 804 828 -HSync +Vsync
Modeline "1024x768_60.00" 64.11 1024 1080 1184 1344 768 769 772 795 -HSync +Vsync
EndSection
 
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
SubSection   "Display"
Modes "1280x1024_60.00" "1024x768_60.00"
EndSubSection
EndSection