@Override     protected void onStart() {         super.onStart();         if(<SPAN style="COLOR: #ff0000">isNetworkConnected()</SPAN>){             new Thread(){                 @Override                 public void run() {                     try {                         Thread.sleep(2000);                         Intent intent = new Intent(<SPAN style="COLOR: #ff0000">SplashActivity.this</SPAN>,<SPAN style="COLOR: #ff0000">CompusAssistMain.class</SPAN>);                         startActivity(intent);                         finish();                     } catch (InterruptedException e) {                         e.printStackTrace();                     }                 }             }.start();         }else{             //弹出对话框 让用户设置网络              AlertDialog.Builder builder = new Builder(this);             builder.setTitle("设置网络");             builder.setMessage("网络错误请设置网络");             builder.setPositiveButton("设置网络", new OnClickListener() {                 public void onClick(DialogInterface dialog, int which) {                     Intent intent = new Intent();                     intent.setClassName(<SPAN style="COLOR: #ff6666">"com.android.settings"</SPAN>, <SPAN style="COLOR: #ff6666">"com.android.settings.WirelessSettings"</SPAN>);                     startActivity(intent);                 }             });             builder.setNegativeButton("取消", new OnClickListener() {                 public void onClick(DialogInterface dialog, int which) {                     finish();                 }             });             builder.create().show();         }     } @Override  protected void onStart() {   super.onStart();   if(isNetworkConnected()){    new Thread(){     @Override     public void run() {      try {       Thread.sleep(2000);       Intent intent = new Intent(SplashActivity.this,CompusAssistMain.class);       startActivity(intent);       finish();      } catch (InterruptedException e) {       e.printStackTrace();      }     }    }.start();   }else{    //弹出对话框 让用户设置网络    AlertDialog.Builder builder = new Builder(this);    builder.setTitle("设置网络");    builder.setMessage("网络错误请设置网络");    builder.setPositiveButton("设置网络", new OnClickListener() {     public void onClick(DialogInterface dialog, int which) {      Intent intent = new Intent();      intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");      startActivity(intent);     }    });    builder.setNegativeButton("取消", new OnClickListener() {     public void onClick(DialogInterface dialog, int which) {      finish();     }    });    builder.create().show();   }  }检测网络的类isNetWorkConnected():

<SPAN style="WHITE-SPACE: pre"> </SPAN>/**      * 判断系统的网络是否可用      * @return      */     private boolean isNetworkConnected(){         ConnectivityManager cm =    (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);         NetworkInfo info =cm.getActiveNetworkInfo();         if(info!=null&&info.isConnected()){             return true;         }else {             return false ;         }       /**   * 判断系统的网络是否可用   * @return   */  private boolean isNetworkConnected(){   ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);   NetworkInfo info =cm.getActiveNetworkInfo();   if(info!=null&&info.isConnected()){    return true;   }else {    return false ;   }

<activity             android:name="com.yan.compusassist.SplashActivity"             android:label="@string/application_name" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity> <activity             android:name="com.yan.compusassist.SplashActivity"             android:label="@string/application_name" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>