Question

我将Alert对话框构建器放在if else语句中。现在，我想做的是在“if”语句中自动关闭对话框并在“else”语句中显示对话框。所以，这是我的代码。

 public void DisplayConn(){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Error");
    builder.setMessage("No Network Connection").setCancelable(false);
    AlertDialog alert = builder.create();

    if(isNetworkStatusAvailable(getApplicationContext())){
        alert.dismiss();
    } else {
        alert.show();
    }
}

我不想使用onClick按钮来关闭对话框，我只想在“if”语句中自动关闭对话框。有可能的？提前谢谢。

Answer 1

将您的代码更改为：

public void DisplayConn(){
        if(!isNetworkStatusAvailable(getApplicationContext())){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Error");
        builder.setMessage("No Network Connection").setCancelable(false);
        AlertDialog alert = builder.create();
            alert.show();
        }
    }

Answer 2

你可以这样做......

   public void DisplayConn(){

        if(!isNetworkStatusAvailable(getApplicationContext())){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Error");
        builder.setMessage("No Network Connection").setCancelable(false);
        AlertDialog alert = builder.create();
            alert.show();
        }
    }

Answer 3

您可以尝试以下

public void DisplayConn(){
    if(isNetworkStatusAvailable(getApplicationContext())){
        Pop.on(this).with().title("Error").cancelable(false).body("No Network Connection").show();
    }
}

将此lib包含在您的gradle依赖项中

dependencies {
    compile 'com.vistrav:pop:2.0'
}

Answer 4

我认为BroadcastReciver会做到这一点。

尝试这样的事情。

if(isNetworkStatusAvailable(getApplicationContext())){
    // do your work
} else {
    this.registerReceiver(mConnReceiver, new IntentFilter(
                    ConnectivityManager.CONNECTIVITY_ACTION));
    alert.show();
}

您的BroadcastReciver将如下所示。

private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {

        if (isNetworkStatusAvailable(getApplicationContext())) {
            alert.dismiss();
        } else {
            // do nothing 
            // Toast.makeText(getApplicationContext(), "Not Connected", 500)
            //      .show();
        }
    }
};

和最终任务..您必须在BroadcastReciver中注册此onResume并在onPause中取消注册。

@Override
protected void onPause() {
    super.onPause();
    Your_class.this.unregisterReceiver(mConnReceiver);
}

protected void onResume() {
    super.onResume();
    IntentFilter i = new IntentFilter(
            "packagename.classname");
    Your_class.this.registerReceiver(mConnReceiver, i);
}

我希望这会帮助你。

if else语句中的警报对话框构建器 - android

4 个答案: