Hao hnrainll

TypedValue.applyDimension()

当我们需要将dp转换成px时，一般我们可以自己写，因为也很简单。其实android api当中已经给我们提供了这个方法了。

TypedValue.applyDimension(COMPLEX_UNIT_DIP, 14, context.getResources().getDisplayMetrics());

作用：将14dp转换为px

	from optparse import OptionParser
	from getpass import getpass
	import base64, hmac, hashlib

	'''
	This small script is meant to generate long passwords by hashing a secret
	password and a site identifier. The intent is to create a usable interface
	for maintaining longer, somewhat more secure (?) passwords.

	The idea here is that you remember a 'master' password and use it to generate

	public class BlankTextDrawable extends Drawable {

	private Paint mPaint = new Paint();
	private RectF mRect = new RectF();
	private static final String text = "wenhao";
	private static final int TEXT_SIZE = 40; //sps

	private Bitmap mBackgroundBitmap;
	private Bitmap mTextBitmap;

	//代码节选自：Drawable.java createFromXmlInner()方法

	switch (name) {
	case "selector":
	drawable = new StateListDrawable();
	break;
	case "animated-selector":
	drawable = new AnimatedStateListDrawable();
	break;
	case "level-list":

	将dp转换为px时，我们通常的做法：
	public static float convertDpToPixel(float dp, Context context){
	final float density = getResources().getDisplayMetrics().density;
	return (dp * scale + 0.5f);
	}

	那么为什么需要+0.5f呢？

	在官方文档中：http://developer.android.com/guide/practices/screens_support.html

	//在onCreate当中调用

	main = LayoutInflater.from(this).inflate(R.layout.activity_main,
	null);
	main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
	setContentView(main);


	fname = raw_input("Enter file name:")

	try:
	fobj = open(fname,"r")
	except IOError, e:
	print 'file open error....'
	else:
	for eachLine in fobj:
	print eachLine,

	import os

	while True:
	filename = raw_input("enter filename:")

	if(os.path.exists(filename)):
	print "%s is already exists" % filename
	else:
	break