简单模拟QQ界面框架。

 package com.lixu.qqjiemian;

 import java.util.Timer;

 import java.util.TimerTask;

 import android.app.Activity;

 import android.content.Intent;

 import android.os.Bundle;

 import android.view.Window;

 //欢迎界面

 public class WelcomActivity extends Activity {

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         requestWindowFeature(Window.FEATURE_NO_TITLE);

         setContentView(R.layout.welcom);

         // 计时器

         TimerTask timetask = new TimerTask() {

             @Override

             public void run() {

                 Intent intent=new Intent(WelcomActivity.this, MainActivity.class);

                 startActivity(intent);

             }

         };

         // 设置时间长短

         Timer time = new Timer();

         time.schedule(timetask, 3000);

     }

 }

 package com.lixu.qqjiemian;

 import android.app.Activity;

 import android.app.Fragment;

 import android.app.FragmentManager;

 import android.app.FragmentTransaction;

 import android.graphics.Color;

 import android.os.Bundle;

 import android.view.View;

 import android.view.Window;

 import android.widget.TextView;

 public class MainActivity extends Activity implements android.view.View.OnClickListener {

     private TextView xiaoxi;

     private TextView lianxiren;

     private TextView dongtai;

     private TextView title;

     private Fragment xiaoxiFragment;

     private Fragment lianxirenFragment;

     private Fragment dongtaiFragment;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         requestWindowFeature(Window.FEATURE_NO_TITLE);

         setContentView(R.layout.activity_main);

         title = (TextView) findViewById(R.id.title);

         xiaoxi = (TextView) findViewById(R.id.xiaoxi);

         lianxiren = (TextView) findViewById(R.id.lianxiren);

         dongtai = (TextView) findViewById(R.id.dongtai);

         xiaoxi.setOnClickListener(this);

         lianxiren.setOnClickListener(this);

         dongtai.setOnClickListener(this);

         xiaoxiFragment = new XiaoxiFragment();

         lianxirenFragment = new LianxirenFragment();

         dongtaiFragment = new DongtaiFragment();

         // 初始化的界面设置

         choose(1);

         title.setText(xiaoxi.getText() + " ");

         chooseFragment(xiaoxiFragment);

     }

     // 设置点击事件

     @Override

     public void onClick(View v) {

         switch (v.getId()) {

         case R.id.xiaoxi:

             choose(1);

             chooseFragment(xiaoxiFragment);

             title.setText(xiaoxi.getText() + " ");

             break;

         case R.id.lianxiren:

             choose(2);

             chooseFragment(lianxirenFragment);

             title.setText(lianxiren.getText() + " ");

             break;

         case R.id.dongtai:

             choose(3);

             chooseFragment(dongtaiFragment);

             title.setText(dongtai.getText() + " ");

             break;

         default:

             break;

         }

     }

     private void choose(int pos) {

         switch (pos) {

         case 1:

             xiaoxi.setTextColor(Color.BLUE);

             xiaoxi.setBackgroundColor(Color.GRAY);

             lianxiren.setTextColor(Color.GRAY);

             lianxiren.setBackgroundColor(Color.WHITE);

             dongtai.setTextColor(Color.GRAY);

             dongtai.setBackgroundColor(Color.WHITE);

             break;

         case 2:

             lianxiren.setTextColor(Color.BLUE);

             lianxiren.setBackgroundColor(Color.GRAY);

             xiaoxi.setTextColor(Color.GRAY);

             xiaoxi.setBackgroundColor(Color.WHITE);

             dongtai.setTextColor(Color.GRAY);

             dongtai.setBackgroundColor(Color.WHITE);

             break;

         case 3:

             dongtai.setTextColor(Color.BLUE);

             dongtai.setBackgroundColor(Color.GRAY);

             lianxiren.setTextColor(Color.GRAY);

             lianxiren.setBackgroundColor(Color.WHITE);

             xiaoxi.setTextColor(Color.GRAY);

             xiaoxi.setBackgroundColor(Color.WHITE);

             break;

         default:

             break;

         }

     }

     // 选择不同的Fragment 的方法

     private void chooseFragment(Fragment fragment) {

         FragmentManager fm = this.getFragmentManager();

         FragmentTransaction ft = fm.beginTransaction();

         ft.replace(R.id.fragment, fragment);

         // 提交

         ft.commit();

     }

 }

 package com.lixu.qqjiemian;

 import android.app.Fragment;

 import android.graphics.Color;

 import android.os.Bundle;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.TextView;

 public class XiaoxiFragment extends Fragment {

     @Override

     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

         View view = inflater.inflate(android.R.layout.simple_list_item_1, null);

         TextView tv = (TextView) view.findViewById(android.R.id.text1);

         tv.setText("消息界面");

         tv.setBackgroundColor(Color.RED);

         return view;

     }

 }

 package com.lixu.qqjiemian;

 import android.app.Fragment;

 import android.graphics.Color;

 import android.os.Bundle;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.TextView;

 public class LianxirenFragment extends Fragment {

     @Override

     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

         View view = inflater.inflate(android.R.layout.simple_list_item_1, null);

         TextView tv = (TextView) view.findViewById(android.R.id.text1);

         tv.setText("联系人界面");

         tv.setBackgroundColor(Color.GREEN);

         return view;

     }

 }

 package com.lixu.qqjiemian;

 import android.app.Fragment;

 import android.graphics.Color;

 import android.os.Bundle;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.TextView;

 public class DongtaiFragment extends Fragment{

     @Override

     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

         View view = inflater.inflate(android.R.layout.simple_list_item_1, null);

         TextView tv = (TextView) view.findViewById(android.R.id.text1);

         tv.setText("动态界面");

         tv.setBackgroundColor(Color.YELLOW);

         return view;

     }

 }

xml：

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:id="@+id/LinearLayout1"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical" >

     <TextView

         android:id="@+id/title"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:gravity="center"

         android:layout_weight="1"

         android:textColor="#f44336"

         android:textSize="30sp" />

     <FrameLayout

         android:id="@+id/fragment"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:layout_weight="10" />

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:layout_weight="1"

         android:orientation="horizontal" >

         <TextView

             android:id="@+id/xiaoxi"

             android:layout_width="wrap_content"

             android:layout_height="match_parent"

             android:layout_weight="1"

             android:gravity="center"

             android:text="消息"

             android:textSize="15sp" />

         <TextView

             android:id="@+id/lianxiren"

             android:layout_width="wrap_content"

             android:layout_height="match_parent"

             android:layout_weight="1"

             android:gravity="center"

             android:text="联系人"

             android:textSize="15sp" />

         <TextView

             android:id="@+id/dongtai"

             android:layout_width="wrap_content"

             android:layout_height="match_parent"

             android:layout_weight="1"

             android:gravity="center"

             android:text="动态"

             android:textSize="15sp" />

     </LinearLayout>

 </LinearLayout>

<?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" >

    <ImageView

        android:id="@+id/welcom"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:background="@drawable/welcome" />

</LinearLayout>

manifest：<activity
            android:name=".WelcomActivity"
            android:label="@string/app_name"
            android:noHistory="true" >
android:noHistory="true"写这个点击回退按钮不回再回到欢迎界面。

 <?xml version="1.0" encoding="utf-8"?>

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"

     package="com.lixu.qqjiemian"

     android:versionCode="1"

     android:versionName="1.0" >

     <uses-sdk

         android:minSdkVersion="19"

         android:targetSdkVersion="19" />

     <application

         android:allowBackup="true"

         android:icon="@drawable/ic_launcher"

         android:label="@string/app_name"

         android:theme="@style/AppTheme" >

         <activity

             android:name=".MainActivity"

             android:label="@string/app_name" >

         </activity>

         <activity

             android:name=".WelcomActivity"

             android:label="@string/app_name"

             android:noHistory="true" >

             <intent-filter>

                 <action android:name="android.intent.action.MAIN" />

                 <category android:name="android.intent.category.LAUNCHER" />

             </intent-filter>

         </activity>

     </application>

 </manifest>

运行效果图：
简单模拟QQ界面框架。

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简单模拟QQ界面框架。

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