Android 判断网络状态,在没有网络的时候，打开网络设置对话框

private LinearLayout linear1,linear2;

 private Button btn1,btn2;

   linear1=(LinearLayout)findViewById(R.id.linearLayout1);

   //activity启动时隐藏

   linear1.setVisibility(View.GONE);

  

   linear2=(LinearLayout)findViewById(R.id.linearLayout2);

   linear2.setVisibility(View.GONE);

  

   btn1=(Button)findViewById(R.id.btn_login);

   btn2=(Button)findViewById(R.id.btn_exit);

   btn1.setOnClickListener(new btn1Onclick());

   btn2.setOnClickListener(new btn2Onclick());

 

------------------------------------------------------------------>>>>>>>>

//打开网络连接设置

 class btn1Onclick implements OnClickListener{

  @Override

  public void onClick(View v) {

   // TODO Auto-generated method stub

   NetWorkStatus();

  }

 }

 //退出

 class btn2Onclick implements OnClickListener{

  @Override

  public void onClick(View v) {

   // TODO Auto-generated method stub

   System.exit(0);

  }

 }

 

public void Connect(){

  Context contexts = MainActivity.this.getApplicationContext();

  // 得到本Activity

  if (!isConnect(contexts)) {

   // 如果网络不好使给出提示

   //isConnect是自定义的检测网络状态的函数

   Toast.makeText(MainActivity.this, "温馨提示:请检查网络连接!",

     Toast.LENGTH_SHORT).show();

   //网络没有连接时显示布局按钮

    linear1.setVisibility(View.VISIBLE);

    linear2.setVisibility(View.VISIBLE);

   return;

  }else{

    System.out.println("网络已经连接上啦！！");

  }

}

 

 public static boolean isConnect(Context context) {

  // 获取手机所有连接管理对象（包括对 Wi-Fi,net等连接的管理）

  ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

  if (connectivity != null) {

   // 获取网络连接管理的对象

   NetworkInfo info = connectivity.getActiveNetworkInfo();

   if (info != null) {

    // 判断当前网络是否已经连接

    if (info.getState() == NetworkInfo.State.CONNECTED) {     

      return true;    

    }    

   }

  }

  return false;

 }

//打开网络设置

 private void NetWorkStatus() {

 

   ConnectivityManager connectivity = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

   connectivity.getActiveNetworkInfo();   

  

    Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络").setMessage("是否对网络进行设置？");

    b.setPositiveButton("是", new DialogInterface.OnClickListener() {

     

    public void onClick(DialogInterface dialog, int whichButton) {

     Intent mIntent = new Intent("/");

     ComponentName comp = new ComponentName( "com.android.settings", "com.android.settings.WirelessSettings");

     mIntent.setComponent(comp);

     mIntent.setAction("android.intent.action.VIEW");

     startActivityForResult(mIntent,0); // 如果在设置完成后需要再次进行操作，可以重写操作代码，在这里不再重写

     System.exit(0);

    }

    

    }

  ).setNeutralButton("否", new DialogInterface.OnClickListener() {

   public void onClick(DialogInterface dialog, int whichButton) {

    dialog.cancel();

    System.exit(0);

    }

   }

  ).show();

 

 }

}

---------------------------------------------------------->>>>>>>>>>>>>>>>>>>>

布局文件

main.xml

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@drawable/h"

    android:orientation="vertical" >

    <LinearLayout

        android:id="@+id/linearLayout1"

        android:layout_width="fill_parent"

        android:layout_height="50dip"

        android:layout_marginTop="250dip"

          >

        <Button

            android:id="@+id/btn_login"

            android:layout_width="fill_parent"

            android:layout_height="50dip"

            android:background="#555555"

            android:text="@string/open" >

        </Button>

        </LinearLayout>

        <LinearLayout

        android:id="@+id/linearLayout2"

        android:layout_width="fill_parent"

        android:layout_height="50dip"

          >

        <Button

            android:id="@+id/btn_exit"

            android:layout_width="fill_parent"

            android:layout_height="50dip"

            android:layout_marginTop="1dip"

            android:background="#555555"

            android:text="@string/exit" >

        </Button>

    </LinearLayout>

</LinearLayout> 

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    转载：http://blog.sina.com.cn/s/blog_8be86ad301010xb6.html