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public class MainActivity extends Activity {
    /** Called when the activity is first created. */
        private static final String TAG ="llsskk";
        private Button btnShort;
        ImageView image = null;
        public static String SCREEN_SHOTS_LOCATION = Environment.getExternalStorageDirectory().getPath();
        private Context mContext=this;
        private int mLCDWidth;
        private int mLCDHeight;
        private static final int PIXEL_BYTES = 4;
        private Bitmap mBitmap=null;
		private DataOutputStream dos=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);   
        WindowManager mWm = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE));
        Point DisplaySize = new Point();
        mWm.getDefaultDisplay().getSize(DisplaySize);

        mLCDWidth = DisplaySize.x;
        mLCDWidth += 8; // fusion3(SGH-I337), maybe plus 8 pixel.
        mLCDHeight = DisplaySize.y;
        image = (ImageView)findViewById(R.id.image);
        btnShort = (Button) findViewById(R.id.btnShots);
        btnShort.setOnClickListener(new Button.OnClickListener() {
                private Bitmap bitmao;

				public void onClick(View v) {
                        try {
                        	Log.v(TAG, "click!!");
                        	bitmao = takeScreenShotBySec();
                        	image.setImageBitmap(bitmao);
                        } catch (Exception e) {
                                // TODO Auto-generated catch block
                                Log.e("tag",TAG);
                        }
                }
        });
    }
	public boolean root() {
		try {
			// 执行su变更用户身份为root
			Process process = Runtime.getRuntime().exec("su");
			dos = new DataOutputStream(process.getOutputStream());
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
		return true;
	}
    protected Bitmap takeScreenShotBySec() {
		// TODO Auto-generated method stub
    	byte[] bytestream = new byte[mLCDWidth * mLCDHeight * PIXEL_BYTES];    	

        InputStream mFIS = null;
        if(root()){    		
    			try {
    				dos.writeBytes("chmod 777 /dev/graphics/fb0\n");
    				dos.flush();
    			} catch (IOException e) {
    				e.printStackTrace();
    			
    			}  		    		
        }

		try {
			mFIS = new FileInputStream(new File("/dev/graphics/fb0"));
			mFIS.read(bytestream);	       

        if (mBitmap != null)
            mBitmap.recycle();
        Log.v(TAG, "take!!");
        mBitmap = Bitmap.createBitmap(mLCDWidth, mLCDHeight, Config.ARGB_8888);
        Log.v(TAG, mBitmap.toString());

        for (int i = 0; i < bytestream.length; i = i + PIXEL_BYTES) {
            byte tem = bytestream[i];
            bytestream[i] = bytestream[i + 2];
            bytestream[i + 2] = tem;
        }

        Buffer buffer = ByteBuffer.wrap(bytestream);

        mBitmap.copyPixelsFromBuffer(buffer);
		
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			Log.v(TAG, e.toString());
		} finally{
			if(mFIS!=null){
				try {
					mFIS.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		return mBitmap;
	}
}