android - 在活动启动之前检查网络状态

Question

我想添加一个功能，当用户单击将您带到网站的按钮时，它应该通知您当前未连接或没有可用的网络连接。目前我有这个代码，但它似乎只是把我直接带到网站（离线无法连接）但没有显示任何信息？

这是我的代码：

next7.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
        startActivity(browserIntent);

    }
  });
}
public void  checkNetworkStatus(){

    final ConnectivityManager connMgr = (ConnectivityManager)
     this.getSystemService(Context.CONNECTIVITY_SERVICE);

     final android.net.NetworkInfo wifi =
     connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

     final android.net.NetworkInfo mobile =
     connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

     if( wifi.isAvailable() ){

     Toast.makeText(this, "Wifi" , Toast.LENGTH_LONG).show();
     }
     else if( mobile.isAvailable() ){

     Toast.makeText(this, "Mobile 3G " , Toast.LENGTH_LONG).show();
     }
     else
     {

         Toast.makeText(this, "No Network " , Toast.LENGTH_LONG).show();
     }

}

任何帮助将不胜感激。谢谢。

Answer 1

让它像这样

public boolean checkNetworkStatus() {
    boolean isConected = false;
    final ConnectivityManager connMgr = (ConnectivityManager) this
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    final android.net.NetworkInfo wifi = connMgr
            .getNetworkInfo(ConnectivityManager.TYPE_WIFI);

    final android.net.NetworkInfo mobile = connMgr
            .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

    if (wifi.isAvailable()) {
        isConected = true;
        Toast.makeText(this, "Wifi", Toast.LENGTH_LONG).show();
    } else if (mobile.isAvailable()) {
        isConected = true;
        Toast.makeText(this, "Mobile 3G ", Toast.LENGTH_LONG).show();
    } else {

        Toast.makeText(this, "No Network ", Toast.LENGTH_LONG).show();
    }
    return isConected;
}

和

if(checkNetworkStatus())
    {
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
        startActivity(browserIntent);
    }
    else{
        //No internet
    }