android动态布局：用java代码实现LinearLayout以及TextView

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);
      }
}