Button btn = new Button(HandlerToActivity.this); 
LinearLayout.LayoutParams params=new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
params.gravity = Gravity.CENTER_HORIZONTAL; 
params.topMargin = 10; 
btn.setLayoutParams(params); 
btn.setLayoutParams(params); 
btn.setTextColor(Color.WHITE); 
btn.setPadding(0, 50, 0, 2); 
btn.setGravity(Gravity.CENTER_HORIZONTAL); 
btn.setTextSize(14); 
btn.setText("这是Button"); 
btn.setBackgroundResource(R.drawable.alertdialog_button); 
buttonLayout.addView(btn);