Android应用中怎么在底端显示选项卡

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import android.app.ActivityGroup;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TabHost;
import android.widget.TextView;
public class TabBottom extends ActivityGroup {
  public static TabHost myTabhost;
  private LayoutParams title_params = new LayoutParams(120, 50);
  private LayoutParams content_params = new LayoutParams(158, 50);
  private LinearLayout titleLayout, showViewLayout, titleLayout1,
  showViewLayout1, titleLayout2, showViewLayout2, titleLayout3,
  showViewLayout3;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.bottomtab);
    myTabhost = (TabHost) findViewById(R.id.edit_item_tab_host);
    myTabhost.setup(this.getLocalActivityManager());
    titleLayout = (LinearLayout) findViewById(R.id.titleLayout_person_check_road_add);
    showViewLayout = (LinearLayout) findViewById(R.id.layout_person_check_road_add);
    titleLayout1 = (LinearLayout) findViewById(R.id.titleLayout_person_check_road_add1);
    showViewLayout1 = (LinearLayout) findViewById(R.id.layout_person_check_road_add1);
    titleLayout2 = (LinearLayout) findViewById(R.id.titleLayout_person_check_road_add2);
    showViewLayout2 = (LinearLayout) findViewById(R.id.layout_person_check_road_add2);
    titleLayout3 = (LinearLayout) findViewById(R.id.titleLayout_person_check_road_add3);
    showViewLayout3 = (LinearLayout) findViewById(R.id.layout_person_check_road_add3);
    myTabhost.addTab(myTabhost
    .newTabSpec("One")
    .setIndicator("收件箱",
    getResources().getDrawable(R.drawable.icon))
    .setContent(R.id.widget_layout_Blue));
    myTabhost.addTab(myTabhost
    .newTabSpec("Two")
    .setIndicator("发件箱",
    getResources().getDrawable(R.drawable.icon))
    .setContent(R.id.widget_layout_green));
    myTabhost.addTab(myTabhost
    .newTabSpec("Three")
    .setIndicator("垃圾箱",
    getResources().getDrawable(R.drawable.icon))
    .setContent(R.id.widget_layout_red));
    myTabhost.addTab(myTabhost
    .newTabSpec("Four")
    .setIndicator("发送",
    getResources().getDrawable(R.drawable.icon))
    .setContent(R.id.widget_layout_yellow));
    showInLayout();
    showInLayout1();
    showInLayout2();
    showInLayout3();
  }
  /*
  * 填充第一个选项卡页面
  */
  private void showInLayout() {
    for (int i = 0; i < 10; i++) {
      String condName = "名称显示1";
      TextView tv = new TextView(this);
      tv.setTextColor(Color.WHITE);
      tv.setTextSize(16);
      tv.setLayoutParams(title_params);
      tv.setText(condName + ":");
      titleLayout.addView(tv);
      EditText tv1 = new EditText(this);
      tv1.setTextSize(16);
      tv1.setLayoutParams(content_params);
      tv1.setText(condName);
      showViewLayout.addView(tv1);
    }
  }
  private void showInLayout1() {
    for (int i = 0; i < 10; i++) {
      String condName = "名称显示2";
      TextView tv = new TextView(this);
      tv.setTextColor(Color.WHITE);
      tv.setTextSize(16);
      tv.setLayoutParams(title_params);
      tv.setText(condName + ":");
      titleLayout1.addView(tv);
      TextView tv1 = new TextView(this);
      tv1.setTextColor(Color.WHITE);
      tv1.setTextSize(16);
      tv1.setLayoutParams(content_params);
      tv1.setText(condName + ":");
      showViewLayout1.addView(tv1);
    }
  }
  private void showInLayout2() {
    for (int i = 0; i < 10; i++) {
      String condName = "名称显示3";
      TextView tv = new TextView(this);
      tv.setTextColor(Color.WHITE);
      tv.setTextSize(16);
      tv.setLayoutParams(title_params);
      tv.setText(condName + ":");
      titleLayout2.addView(tv);
      TextView tv1 = new TextView(this);
      tv1.setTextColor(Color.WHITE);
      tv1.setTextSize(16);
      tv1.setLayoutParams(content_params);
      tv1.setText(condName + ":");
      showViewLayout2.addView(tv1);
    }
  }
  private void showInLayout3() {
    for (int i = 0; i < 10; i++) {
      String condName = "名称显示4";
      TextView tv = new TextView(this);
      tv.setTextColor(Color.WHITE);
      tv.setTextSize(16);
      tv.setLayoutParams(title_params);
      tv.setText(condName + ":");
      titleLayout3.addView(tv);
      TextView tv1 = new TextView(this);
      tv1.setTextColor(Color.WHITE);
      tv1.setTextSize(16);
      tv1.setLayoutParams(content_params);
      tv1.setText(condName + ":");
      showViewLayout3.addView(tv1);
    }
  }
}