1 package com.example.codeUI; 2  3 import android.app.Activity; 4 import android.os.Bundle; 5 import android.view.Gravity; 6 import android.widget.LinearLayout; 7 import android.widget.TextView; 8  9 public class MainActivity extends Activity {10 11     @Override12     protected void onCreate(Bundle savedInstanceState) {13         super.onCreate(savedInstanceState);14         LinearLayout  ll=new LinearLayout(this);15         ll.setGravity(Gravity.CENTER);16         TextView tv=new TextView(this);17         tv.setTextSize(20.0f);18         tv.setText("江西");19         ll.addView(tv);20         setContentView(ll);21      }22 }