<LinearLayout
  。。。。。。。。。。 <FrameLayout     android:id="@+id/id_content"android:layout_width="fill_parent"android:layout_height="0dp"android:layout_weight="1" /><include layout="@layout/bottom" />
</LinearLayout>

  1 package com.imooc.tab02;
  2
  3 import android.os.Bundle;
  4 import android.support.v4.app.Fragment;
  5 import android.support.v4.app.FragmentActivity;
  6 import android.support.v4.app.FragmentManager;
  7 import android.support.v4.app.FragmentTransaction;
  8 import android.view.View;
  9 import android.view.View.OnClickListener;
 10 import android.view.Window;
 11 import android.widget.ImageButton;
 12 import android.widget.LinearLayout;
 13
 14 public class MainActivity extends FragmentActivity implements OnClickListener {
 15     private LinearLayout mTabWeixin;
 16     private LinearLayout mTabFrd;
 17     private LinearLayout mTabAddress;
 18     private LinearLayout mTabSettings;
 19
 20     private ImageButton mImgWeixin;
 21     private ImageButton mImgFrd;
 22     private ImageButton mImgAddress;
 23     private ImageButton mImgSettings;
 24
 25     private Fragment mTab01;
 26     private Fragment mTab02;
 27     private Fragment mTab03;
 28     private Fragment mTab04;
 29
 30     @Override
 31     protected void onCreate(Bundle savedInstanceState) {
 32         super.onCreate(savedInstanceState);
 33
 34         requestWindowFeature(Window.FEATURE_NO_TITLE);
 35         setContentView(R.layout.activity_main);
 36
 37         initView();
 38         initEvent();
 39         setSelect(0);
 40     }
 41
 42     private void initEvent() {
 43         mTabWeixin.setOnClickListener(this);
 44         mTabFrd.setOnClickListener(this);
 45         mTabAddress.setOnClickListener(this);
 46         mTabSettings.setOnClickListener(this);
 47     }
 48
 49     private void initView() {
 50         mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
 51         mTabFrd = (LinearLayout) findViewById(R.id.id_tab_frd);
 52         mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
 53         mTabSettings = (LinearLayout) findViewById(R.id.id_tab_settings);
 54
 55         mImgWeixin = (ImageButton) findViewById(R.id.id_tab_weixin_img);
 56         mImgFrd = (ImageButton) findViewById(R.id.id_tab_frd_img);
 57         mImgAddress = (ImageButton) findViewById(R.id.id_tab_address_img);
 58         mImgSettings = (ImageButton) findViewById(R.id.id_tab_settings_img);
 59     }
 60
 61     private void setSelect(int i) {
 62         FragmentManager fm = getSupportFragmentManager();
 63         FragmentTransaction transaction = fm.beginTransaction();
 64         hideFragment(transaction);
 65         // 把图片设置为亮的
 66         // 设置内容区域
 67         switch (i) {
 68         case 0:
 69             if (mTab01 == null) {
 70                 mTab01 = new WeixinFragment();
 71                 transaction.add(R.id.id_content, mTab01);
 72             } else {
 73                 transaction.show(mTab01);
 74             }
 75             mImgWeixin.setImageResource(R.drawable.tab_weixin_pressed);
 76             break;
 77         case 1:
 78             if (mTab02 == null) {
 79                 mTab02 = new FrdFragment();
 80                 transaction.add(R.id.id_content, mTab02);
 81             } else {
 82                 transaction.show(mTab02);
 83             }
 84             mImgFrd.setImageResource(R.drawable.tab_find_frd_pressed);
 85             break;
 86         case 2:
 87             if (mTab03 == null) {
 88                 mTab03 = new AddressFragment();
 89                 transaction.add(R.id.id_content, mTab03);
 90             } else {
 91                 transaction.show(mTab03);
 92             }
 93             mImgAddress.setImageResource(R.drawable.tab_address_pressed);
 94             break;
 95         case 3:
 96             if (mTab04 == null) {
 97                 mTab04 = new SettingFragment();
 98                 transaction.add(R.id.id_content, mTab04);
 99             } else {
100                 transaction.show(mTab04);
101             }
102             mImgSettings.setImageResource(R.drawable.tab_settings_pressed);
103             break;
104
105         default:
106             break;
107         }
108
109         transaction.commit();
110     }
111
112     private void hideFragment(FragmentTransaction transaction) {
113         if (mTab01 != null) {
114             transaction.hide(mTab01);
115         }
116         if (mTab02 != null) {
117             transaction.hide(mTab02);
118         }
119         if (mTab03 != null) {
120             transaction.hide(mTab03);
121         }
122         if (mTab04 != null) {
123             transaction.hide(mTab04);
124         }
125     }
126
127     @Override
128     public void onClick(View v) {
129         resetImgs();   // 切换图片至暗色
130         switch (v.getId()) {
131         case R.id.id_tab_weixin:
132             setSelect(0);
133             break;
134         case R.id.id_tab_frd:
135             setSelect(1);
136             break;
137         case R.id.id_tab_address:
138             setSelect(2);
139             break;
140         case R.id.id_tab_settings:
141             setSelect(3);
142             break;
143
144         default:
145             break;
146         }
147     }
148
149     /**
150      * 切换图片至暗色
151      */
152     private void resetImgs() {
153         mImgWeixin.setImageResource(R.drawable.tab_weixin_normal);
154         mImgFrd.setImageResource(R.drawable.tab_find_frd_normal);
155         mImgAddress.setImageResource(R.drawable.tab_address_normal);
156         mImgSettings.setImageResource(R.drawable.tab_settings_normal);
157     }
158
159 }