android开发的一些常用不常用的公共方法

//将 R.drawable里面的图片资源转成换Bitmap型 

Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon); 
Bitmap newb = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 ); 
Canvas canvasTemp = new Canvas( newb );  
canvasTemp.drawBitmap(bmp, 50, 50, p); 

    InputStream is = getResources().openRawResource(R.drawable.icon);  
    Bitmap mBitmap = BitmapFactory.decodeStream(is); 

/** 
* 根据日期“2013-12-18”得到星期几 
* @param pTime 
* @return

[size=large][/size]

*/ 
public String getWeek(String pTime) { 
String Week = ""; 
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); 
Calendar c = Calendar.getInstance(); 
try { 
c.setTime(format.parse(pTime)); 
} catch (ParseException e) { 
e.printStackTrace(); 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 1) { 
Week += "日"; 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 2) { 
Week += "一"; 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 3) { 
Week += "二"; 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 4) { 
Week += "三"; 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 5) { 
Week += "四"; 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 6) { 
Week += "五"; 
} 
if (c.get(Calendar.DAY_OF_WEEK) == 7) { 
Week += "六"; 
} 
return Week; 
} 

public DisplayImageOptions picCircleOptions(Context context) { 
DisplayImageOptions options = new DisplayImageOptions.Builder() 
.displayer( 
new RoundedBitmapDisplayer(new DPIUtil().dip2px( 
context, 35.0f))).build(); 
return options; 
} 
/** 
* 判断字符串是否是数字(0.0) 
* @param str 
* @return 
*/ 
public boolean isNumeric(String str) { 
if(str == null || str.equals("")) { 
return false; 
} 
char[] p = str.toCharArray(); 
for (int i = 0; i < p.length; i++) { 
if(!isNum(""+p[i])) { 
return false; 
} 
} 
return true; 
} 

private boolean isNum(String str) { 
Pattern pattern = Pattern.compile("[0-9.]*"); 
Matcher isNum = pattern.matcher(str); 
if (!isNum.matches()) { 
return false; 
} 
return true; 
} 

/** 
* 隐藏软键盘 
* @param context 
*/ 
public void hideSoftKeyboard(Context context) { 
((InputMethodManager) context.getSystemService("input_method")). 
hideSoftInputFromWindow(((Activity) context).getCurrentFocus(). 
getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); 
} 

//判断当前ImageView是显示的哪一个本地图片 
if(ivStartTest.getDrawable().getConstantState() == getResources().getDrawable(R.drawable.ic_start_test).getConstantState()) 
{ 
} 

// 代码里实现对控件的属性设置 

RelativeLayout.Layoutparams params = (RelativeLayout.LayoutParams)button.getLayoutParams(); 
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
params.addRule(RelativeLayout.LEFT_OF, R.id.id_to_be_left_of); 
//1是控件的Id：rlTopView.setId(1); 
params.addRule(RelativeLayout.BELOW, 1); 

button.setLayoutParams(params); //使layout更新 
//添加权重： 
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, 
height, 1); 
llNews.setWeightSum(3.0f);