Android版本检测\自动更新(2)

        try {  
            ConnectivityManager cm = (ConnectivityManager) ctx  
                    .getSystemService(Context.CONNECTIVITY_SERVICE);  
            NetworkInfo info = cm.getActiveNetworkInfo();  
            return (info != null && info.isConnected());  
        } catch (Exception e) {  
            e.printStackTrace();  
            return false;  
        }  
    }  
    public void showUpdateDialog() {  
        @SuppressWarnings("unused")  
        AlertDialog alert = new AlertDialog.Builder(this.activity)  
                .setTitle("Title")  
                .setIcon(R.drawable.icon)  
                .setMessage("Update or not?")  
                .setPositiveButton("Update",  
                        new DialogInterface.OnClickListener() {  
                            public void onClick(DialogInterface dialog,  
                                    int which) {  
                                downloadTheFile(strURL);  
                                showWaitDialog();  
                            }