Question

如果没有互联网连接，我会弹出警报对话框。问题是UI每2秒刷新一次，每2秒弹出一个新对话框。有没有办法阻止这个？这是我的代码：

public boolean isNetworkAvailable() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}


public void setUI(){
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
    builder.setTitle("No internet connection");
    builder.setMessage("message ")
            .setPositiveButton("Retry", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {

                    // intentionally do nothing;
                }
            })
            .setNegativeButton("Close", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // User cancelled the dialog --> soft-close the app
                    finish();
                }
            });


    if (!isNetworkAvailable()){
        builder.show();
    }
}

在ErrorNotificationEvent中我得到了这个

@Subscribe
public void onErrorNotificationEvent(ErrorNotificationEvent event) {
    setUI();
}

Answer 1

创建对话框时应该保留对Dialog的引用，如果已经显示，则不要再显示它：

private AlertDialog _dialog;

public void setUI(){
    if (!isNetworkAvailable() && (_dialog == null || !_dialog.isShowing())) {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        ...

        _dialog = builder.show();
    }
}

Answer 2

您可以将一个计时器放入setUI调用中，以便在经过一定时间后它不会显示该对话框。

public long lastUIUpdate = 0;

@Subscribe
public void onErrorNotificationEvent(ErrorNotificationEvent event) {
        if (System.currentTimeMillis() > lastUIUpdate + DateUtils.MINUTE_IN_MILLIS){
            lastUIUpdate = System.currentTimeMillis();
            setUI();
        }
}

当UI刷新时，如何停止alertDialog复制？

2 个答案: