<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><TextViewandroid:layout_width="match_parent"android:layout_height="60dip"android:background="#8866ff00"android:gravity="center"android:text="程序锁"android:textSize="24sp" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center_horizontal"android:orientation="horizontal" ><TextViewandroid:id="@+id/tv_unlock"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/tab_left_pressed"android:gravity="center"android:text="未加锁" /><TextViewandroid:id="@+id/tv_lock"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/tab_right_default"android:gravity="center"android:text="已加锁" /></LinearLayout><FrameLayoutandroid:id="@+id/fl_content"android:layout_width="match_parent"android:layout_height="match_parent" /></LinearLayout>

package com.itheima.mobileguard.activities;import com.itheima.mobileguard.R;
import com.itheima.mobileguard.fragment.LockFragment;
import com.itheima.mobileguard.fragment.UnLockFragment;import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.FrameLayout;
import android.widget.TextView;public class AppLockActivity extends FragmentActivity implementsOnClickListener {private FrameLayout fl_content;private TextView tv_unlock;private TextView tv_lock;private FragmentManager fragmentManager;private UnLockFragment unLockFragment;private LockFragment lockFragment;@Overrideprotected void onCreate(Bundle arg0) {super.onCreate(arg0);initUI();}private void initUI() {setContentView(R.layout.activity_app_lock);fl_content = (FrameLayout) findViewById(R.id.fl_content);tv_unlock = (TextView) findViewById(R.id.tv_unlock);tv_lock = (TextView) findViewById(R.id.tv_lock);tv_unlock.setOnClickListener(this);tv_lock.setOnClickListener(this);//获取到fragment的管理者
        fragmentManager = getSupportFragmentManager();//开启事务FragmentTransaction mTransaction = fragmentManager.beginTransaction();unLockFragment = new UnLockFragment();lockFragment = new LockFragment();/*** 替换界面* 1 需要替换的界面的id* 2具体指某一个fragment的对象*/mTransaction.replace(R.id.fl_content, unLockFragment).commit();}@Overridepublic void onClick(View v) {FragmentTransaction ft = fragmentManager.beginTransaction();switch (v.getId()) {case R.id.tv_unlock://没有加锁
            tv_unlock.setBackgroundResource(R.drawable.tab_left_pressed);tv_lock.setBackgroundResource(R.drawable.tab_right_default);ft.replace(R.id.fl_content, lockFragment);System.out.println("切换到lockFragment");break;case R.id.tv_lock://没有加锁
            tv_unlock.setBackgroundResource(R.drawable.tab_left_default);tv_lock.setBackgroundResource(R.drawable.tab_right_pressed);ft.replace(R.id.fl_content, unLockFragment);System.out.println("切换到unlockFragment");break;}ft.commit();}
}