《疯狂安卓讲义》P63 -- 实例：用编程的方式开发UI界面

public class CodeViewActivity extends Activity {    //第一次创建该Activity时回调该方法
    @Override    protected void onCreate(Bundle saveInstanceState) {        super.onCreate(saveInstanceState);        //创建一个线性布局管理器        LinearLayout layout = new LinearLayout(this);        //设置该Activity显示layout        super.setContentView(layout);        layout.setOrientation(LinearLayout.VERTICAL);        //创建一个TextView        final TextView show = new TextView(this);        //创建一个按钮        Button bn = new Button(this);        bn.setText(R.string.ok);        bn.setLayoutParams(new ViewGroup.LayoutParams(                ViewGroup.LayoutParams.WRAP_CONTENT,                ViewGroup.LayoutParams.WRAP_CONTENT));        //向layout容器中添加TextView        layout.addView(show);        //向layout容器中添加按钮        layout.addView(bn);        //为按钮绑定一个事件监听器        bn.setOnClickListener(new View.OnClickListener()        {            @Override            public void onClick(View v)            {                show.setText("Hello , Android , " + new java.util.Date());            }        });    }}