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在我的片段中，如果未填写某个文本字段，则会以对话框的形式向用户显示一条错误消息，该对话框显示为 itended。但是，我需要根据错误消息的长度以编程方式更改对话框的高度。

在我的片段的 onCreateView() 方法中，我已经成功地能够从对话框的 xml 文件中打印 TextView 元素之一的值。

View deetsView = inflater.inflate(R.layout.sign_up_fill_details, null);
View t = deetsView.findViewById(R.id.dialogText);
String val = ((TextView)t).getText().toString();
System.out.println(val);

val 成功打印为“TeStInG”，这是正确的值。xml文件如下，确认android:text="TeStInG"。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/signUpFillDeets"
android:orientation="vertical"
android:layout_width="210dp"
android:layout_height="230dp"
android:background="#ffffffff">

<ImageView
    android:id="@+id/crossImage"
    android:layout_width="match_parent"
    android:src="@drawable/dialog_cross"
    android:layout_height="120dp"
    android:gravity="center"
    android:background="#1F1C1C"
    android:scaleType="fitCenter" />

<TextView
    android:id="@+id/dialogText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/crossImage"
    android:layout_marginTop="20dp"
    android:layout_marginLeft="4dp"
    android:layout_marginRight="4dp"
    android:layout_marginBottom="20dp"
    android:textSize="18sp"
    android:text="TeStInG"
    android:textColor="#ff000000"
    android:layout_centerHorizontal="true"
    android:gravity="center_horizontal" />

<Button
    android:id="@+id/dialogButton"
    android:layout_width="70dp"
    android:layout_height="30dp"
    android:text="OK"
    android:textStyle="italic"
    android:gravity="center_vertical|center_horizontal"
    android:layout_below="@+id/dialogText"
    android:layout_marginBottom="20dp"
    android:background="@drawable/button_background_red"
    android:layout_centerHorizontal="true"
    android:textColor="#ffffffff" />

</RelativeLayout>

但是，当我尝试通过其 ID (signUpFillDeets) 访问布局文件时，不会发生任何更改。

下面的代码全部在 onCreateView() 中完成，实际显示对话框的代码在 setUserVisibleHint() 方法中。所以从逻辑上讲，如果我此时设置错误消息的高度，它应该对对话框的尺寸产生永久影响，直到应用程序关闭。

尝试1：

deetsView.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, 3000));

尝试2：

RelativeLayout layout = (RelativeLayout)deetsView.findViewById(R.id.signUpFillDeets);
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) layout.getLayoutParams();
params.height = 300;
layout.setLayoutParams(params);

导致错误 - java.lang.NullPointerException: Attempt to write to field 'int android.view.ViewGroup$LayoutParams.height' on an null object reference

尝试 3：

RelativeLayout layout = (RelativeLayout)deetsView.findViewById(R.id.signUpFillDeets);
RelativeLayout.LayoutParams dimensions = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, 3000);
layout.setLayoutParams(dimensions);

有人可以帮忙吗？

更新 - onCreateView() 和 setUserVisibleHint()

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    View view = inflater.inflate(R.layout.sign_up_fragment_third, container, false);
    // we need to apply our custom font to the TextViews on our fragment. So first need to reference the TextView components via our sign_up_fragment_third view, and apply the TypeFact
    View title = view.findViewById(R.id.signUpTertTitle);

    View deetsView = inflater.inflate(R.layout.sign_up_fill_details, null);
    View t = deetsView.findViewById(R.id.dialogText);
    String val = ((TextView)t).getText().toString();
    System.out.println(val);

    RelativeLayout layout = (RelativeLayout)deetsView.findViewById(R.id.signUpFillDeets);
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) layout.getLayoutParams();
    params.height = 300;
    layout.setLayoutParams(params);

    /*
       Attempt 1
    deetsView.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, 3000));

        Attempt 2
    RelativeLayout layout = (RelativeLayout)deetsView.findViewById(R.id.signUpFillDeets);
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) layout.getLayoutParams();
    params.height = 300;
    */

    return view;
}

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser) {
        // if the user has not supplied a first name then we will display to them an prompt to enter a first name.
        String firstName = ((EditText)SignUpFragmentSecond.firstName).getText().toString();
        System.out.println("First name val is " + firstName);
        String errorMessage = "Need to fill out ";

        if(firstName.equals("")){
            System.out.println("First name is empty");
            errorMessage += " First Name, ";
            System.out.println("Now is " + errorMessage);
        }

        if(!errorMessage.equals("Need to fill out ")){
            SignUpActivity.pager.setCurrentItem(1);
            SignUpFillDetails dialog = new SignUpFillDetails();
            dialog.showDialog(getActivity(), errorMessage);
        }
    } else {
        System.out.println("THIRD is not visible to the user");
    }
}

添加了更新的 onViewCreated() 并列出了导入以防它被使用

import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;

@Override
public void onViewCreated(View view, Bundle savedInstanceState){
    super.onViewCreated(view, savedInstanceState);

    LayoutInflater inflater = LayoutInflater.from(getContext());

    View deetsView = inflater.inflate(R.layout.sign_up_fill_details, null);
    RelativeLayout layout = (RelativeLayout)deetsView.findViewById(R.id.signUpFillDeets);
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) layout.getLayoutParams();

    params.height = 300;
    layout.setLayoutParams(params);
}
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