TelephonyManager telmgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);                  String deviceID = telmgr.getDeviceId(); 
                boolean isEmulator = "000000000000000".equalsIgnoreCase(deviceID); 
 
                
                if (isEmulator) { 
                    ((myApp) getApplication()).setBitmapX(BitmapFactory.decodeFile(imageFileName)); 
                } else { 
                    ((myApp) getApplication()).setBitmapX(BitmapFactory.decodeByteArray((byte[]) args[0], 0, ((byte[])args[0]).length)); 
                } 

// TYPE_CLASS_NUMBER: Class for numeric text. This displays the numbers/symbols keyboard. 
editText.setInputType(TYPE_CLASS_NUMBER); 
 
// TYPE_CLASS_PHONE: Class for a phone number. This displays the phone number keypad. 
editText.setInputType(TYPE_CLASS_PHONE); 

1. 根据不同的形式修改button需要重写

 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
      int w = <calculation> 
      int h = <calculation> 
      setMeasuredDimension(w, h); 
   } 
2.

这里的随机数不仅仅是数字还可能是别的

final String alphabet = "0123456789ABCDE"; 
    final int N = alphabet.length(); 
 
    Random r = new Random(); 
 
    for (int i = 0; i < 50; i++) { 
        System.out.print(alphabet.charAt(r.nextInt(N))); 
    }