ViewPager，使用Fragment实现

  1 package com.example.imooc_tab02;
  2 
  3 import android.os.Bundle;
  4 import android.support.v4.app.FragmentActivity;
  5 import android.support.v4.app.FragmentManager;
  6 import android.support.v4.app.FragmentTransaction;
  7 import android.view.View;
  8 import android.view.View.OnClickListener;
  9 import android.widget.ImageButton;
 10 import android.widget.LinearLayout;
 11 
 12 public class MainActivity extends FragmentActivity implements OnClickListener {
 13     // tabs
 14     LinearLayout tab_weixin, tab_frd, tab_addr, tab_settings;
 15     // ImageButton
 16     ImageButton btn_weixin, btn_py, btn_txl, btn_sz;
 17 
 18     tab01 t1;
 19     tab02 t2;
 20     tab03 t3;
 21     tab04 t4;
 22 
 23     @Override
 24     protected void onCreate(Bundle savedInstanceState) {
 25         super.onCreate(savedInstanceState);
 26         setContentView(R.layout.main);
 27         t1 = new tab01();
 28         t2 = new tab02();
 29         t3 = new tab03();
 30         t4 = new tab04();
 31         initView();
 32         initEvents();
 33         
 34         /*
 35          * 把tab添加到FrameLayout中，transaction的前一个参数是FrameLayout
 36          * 的id,第二个参数是Fragment的继承类的实例对象
 37          */
 38         // transaction.add(R.id.id_fragment, t1);
 39 
 40     }
 41 
 42     private void initEvents() {
 43         tab_weixin.setOnClickListener(this);
 44         tab_frd.setOnClickListener(this);
 45         tab_addr.setOnClickListener(this);
 46         tab_settings.setOnClickListener(this);
 47         tab_addr.callOnClick();//设置通讯录为默认点击，
 48     }
 49 
 50     private void initView() {
 51         // TODO Auto-generated method stub
 52         tab_weixin = (LinearLayout) findViewById(R.id.id_tab_weixin2);
 53         // tab_frd,tab_addr,tab_settings
 54         tab_frd = (LinearLayout) findViewById(R.id.id_tab_frd2);
 55         tab_addr = (LinearLayout) findViewById(R.id.id_tab_address2);
 56         tab_settings = (LinearLayout) findViewById(R.id.id_tab_settings2);
 57 
 58         // btn_weixin,btn_py,btn_txl,btn_sz;
 59         btn_weixin = (ImageButton) findViewById(R.id.id_imgbtn_wx);
 60         btn_py = (ImageButton) findViewById(R.id.id_imgbtn_py);
 61         btn_txl = (ImageButton) findViewById(R.id.id_imgbtn_txl);
 62         btn_sz = (ImageButton) findViewById(R.id.id_imgbtn_sz);
 63     }
 64 
 65     @Override
 66     public void onClick(View v) {
 67         // TODO Auto-generated method stub
 68         FragmentManager manager = getSupportFragmentManager();
 69         FragmentTransaction transaction = manager.beginTransaction();
 70         hideFragment(transaction);
 71         switch (v.getId()) {
 72         case R.id.id_tab_weixin2:
 73             resetImg();
 74             if(!t1.isAdded()){
 75                 //如果fragment对象t1没有被添加，那么就添加并显示
 76                 transaction.add(R.id.id_fragment, t1);
 77             }
 78             transaction.show(t1);
 79             btn_weixin.setImageResource(R.drawable.tab_weixin_pressed);
 80             break;
 81         case R.id.id_tab_frd2:
 82             resetImg();
 83             if (!t2.isAdded()) {
 84                 transaction.add(R.id.id_fragment, t2);
 85             } 
 86             transaction.show(t2);
 87             btn_py.setImageResource(R.drawable.tab_find_frd_pressed);
 88             break;
 89         case R.id.id_tab_address2:
 90             resetImg();
 91             if (!t3.isAdded()) {
 92                 transaction.add(R.id.id_fragment, t3);
 93             } 
 94             transaction.show(t3);
 95             btn_txl.setImageResource(R.drawable.tab_address_pressed);
 96             break;
 97         case R.id.id_tab_settings2:
 98             resetImg();
 99             if (!t4.isAdded()) {
100                 transaction.add(R.id.id_fragment, t4);
101             } 
102             transaction.show(t4);
103             btn_sz.setImageResource(R.drawable.tab_settings_pressed);
104             break;
105 
106         default:
107             break;
108         }
109         transaction.commit();
110     }
111 
112     private void hideFragment(FragmentTransaction transaction) {
113         System.out.println("====开始hideFragment()...====");
114         // TODO Auto-generated method stub
115         if (t1 != null) {
116             System.out.println("hide(t1)...");
117             transaction.hide(t1);
118         }
119         if (t2 != null) {
120             System.out.println("hide(t2)...");
121             transaction.hide(t2);
122         }
123         if (t3 != null) {
124             System.out.println("hide(t3)...");
125             transaction.hide(t3);
126         }
127         if (t4 != null) {
128             System.out.println("hide(t4)...");
129             transaction.hide(t4);
130         }
131     }
132 
133     // 重置按钮为灰色的
134     public void resetImg() {
135         btn_weixin.setImageResource(R.drawable.tab_weixin_normal);
136         btn_py.setImageResource(R.drawable.tab_find_frd_normal);
137         btn_txl.setImageResource(R.drawable.tab_address_normal);
138         btn_sz.setImageResource(R.drawable.tab_settings_normal);
139     }
140 }