Fragment的隐藏与显示

package com.bwie.helpdemo;

import com.bwie.fragment.BillFrag;
import com.bwie.fragment.IndexFrag;
import com.bwie.fragment.TaskFrag;

import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class IndexActivity extends FragmentActivity implements OnClickListener {

private Button index_bill;
private TextView index_home;
private TextView index_task;

private IndexFrag indexFrag;
private BillFrag billFrag;
private TaskFrag taskFrag;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_index);

// 找控件
findView();

// 为布局添加fragment,开启事物
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction tran = fm.beginTransaction();

indexFrag = new IndexFrag();
billFrag = new BillFrag();
taskFrag = new TaskFrag();
//R.id.relative为布局
tran.add(R.id.relative, indexFrag, "index").show(indexFrag)
.add(R.id.relative, billFrag, "bill").hide(billFrag)
.add(R.id.relative, taskFrag, "task").hide(taskFrag);

tran.commit();

// 为按钮设置点击监听
index_bill.setOnClickListener(this);
index_home.setOnClickListener(this);
index_task.setOnClickListener(this);
}

private void findView() {
index_bill = (Button) findViewById(R.id.index_bill);
index_home = (TextView) findViewById(R.id.index_home);
index_task = (TextView) findViewById(R.id.index_task);

}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.index_bill:
// 获取事物
FragmentManager fm_1 = getSupportFragmentManager();
FragmentTransaction tran_0 = fm_1.beginTransaction();
tran_0.show(billFrag).hide(indexFrag).hide(taskFrag).commit();

break;

case R.id.index_home:
FragmentManager fm_2 = getSupportFragmentManager();
FragmentTransaction tran_1 = fm_2.beginTransaction();
tran_1.show(indexFrag).hide(billFrag).hide(taskFrag).commit();

break;
case R.id.index_task:
FragmentManager fm_3 = getSupportFragmentManager();
FragmentTransaction tran_2 = fm_3.beginTransaction();
tran_2.show(taskFrag).hide(billFrag).hide(indexFrag).commit();
break;
}

}
}