代码如下：

package com.app;   import com.app.form.AutoCompleteActivity;  import com.app.form.ProgressActivity;  import com.app.form.RadioAndCheckboxActivity;  import com.app.form.RatingBarActivity;  import com.app.form.SeekBarActivity;  import com.app.form.SpinnerActivity;  import com.app.form.ToggleButtonActivity;  import com.app.list.ExpandableList1;   import android.app.Activity;  import android.content.Intent;  import android.os.Bundle;  import android.view.View;  import android.view.View.OnClickListener;  import android.view.ViewGroup.LayoutParams;  import android.widget.LinearLayout;  import android.widget.TextView;   /**   * 范例：五种布局方式的范例   * 1.该文件中没有用到XML形式的静态布局，而是动态布局   * @author Administrator   */  public class MainActivity extends Activity implements OnClickListener {                 //实例化一个10个TextView的数组        TextView tvArray[] = new TextView[20];         //实例化一个线性布局的参数        LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(                    LayoutParams. FILL_PARENT, LayoutParams.FILL_PARENT);                LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(                    LayoutParams. FILL_PARENT, LayoutParams.WRAP_CONTENT);       @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);                   //实例化线性布局并设置垂直方向          LinearLayout lin1 = new LinearLayout(this);          lin1.setOrientation(LinearLayout. VERTICAL);                   //创建n个TextView并设置ID 监听器等，最后添加到线性布局中          for (int i = 0; i < 20; i++) {               tvArray[i] = new TextView(this);               tvArray[i].setId(i);               tvArray[i].setOnClickListener(this);              lin1.addView( tvArray[i], lp2 );              }          //设置各TextView的文本          tvArray[0].setText("表单控件-单选Radio和复选Checkbox" );          tvArray[1].setText("表单控件-下拉菜单Spinner" );          tvArray[2].setText("表单控件-自动完成AutoComplete" );          tvArray[3].setText("表单控件-进度条ProgressBar" );          tvArray[4].setText("表单控件-滑动条SeekBar" );          tvArray[5].setText("表单控件-评分RatingBar" );          tvArray[6].setText("表单控件-ToggleButton" );          tvArray[7].setText("复合控件-列表ListView" );          tvArray[8].setText("复合控件-折叠式列表ExpandableList" );          tvArray[9].setText("复合控件-网格视图GridView" );          tvArray[10].setText("复合控件-滚动视图ScrollView" );               setContentView(lin1); //此处从R.layout.XXX改成了某个View的实例      }          @Override         public void onClick(View v) {              Intent intent = new Intent();               if(v.getId()==0) {                    intent.setClass(MainActivity. this, RadioAndCheckboxActivity.class );              } else if (v.getId()==1) {                    intent.setClass(MainActivity. this, SpinnerActivity.class );              } else if (v.getId()==2) {                    intent.setClass(MainActivity. this, AutoCompleteActivity.class );              } else if (v.getId()==3) {                    intent.setClass(MainActivity. this, ProgressActivity.class );              } else if (v.getId()==4) {                    intent.setClass(MainActivity. this, SeekBarActivity.class );              } else if (v.getId()==5) {                    intent.setClass(MainActivity. this, RatingBarActivity.class );              } else if (v.getId()==6) {                    intent.setClass(MainActivity. this, ToggleButtonActivity.class );              } else if (v.getId()==7) {                    intent.setClass(MainActivity. this, ListsActivity.class );              } else if (v.getId()==8) {                    intent.setClass(MainActivity. this, ExpandableList1.class );              } else if (v.getId()==9) {                    intent.setClass(MainActivity. this, Grid.class);              } else if (v.getId()==10) {                    intent.setClass(MainActivity. this, ScrollViewActivity.class );              }              startActivity(intent);        }  }