1 package cn.itcast.codeui;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.widget.Button;
 8 import android.widget.LinearLayout;
 9 import android.widget.TextView;
10 
11 public class DemoActivity extends Activity {
12     /** Called when the activity is first created. */
13     @Override
14     public void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16        final LinearLayout ll = new LinearLayout(this);
17        ll.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));
18        ll.setOrientation(LinearLayout.VERTICAL);
19        TextView tv = new TextView(this);
20        tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
21        tv.setText(R.string.hello);
22        ll.addView(tv);
23      
24        Button bt = new Button(this);
25        bt.setText("顯示一個新的textview");
26        bt.setOnClickListener(new OnClickListener() {
27         
28         @Override
29         public void onClick(View v) {
30               TextView tv = new TextView(DemoActivity.this);
31                tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
32                tv.setText("我是新的textview");
33                ll.addView(tv);
34         }
35      });
36        ll.addView(bt);
37        
38        setContentView(ll);
39     }
40 }