如何在PreferenceScreen中添加按钮? [英] How to add a button to a PreferenceScreen?

问题描述

我是Android开发的新手，刚遇到偏好设置. 我找到了PreferenceScreen，并想用它创建登录功能.我唯一的问题是我不知道如何添加登录"页面.按钮点击PreferenceScreen.

I'm quite new to Android Development and just came across Preferences. I found PreferenceScreen and wanted to create a login functionality with it. The only problem I have is that I don't know how I could add a "Login" button to the PreferenceScreen.

这是我的PreferenceScreen的样子:

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
...
    <PreferenceScreen android:title="@string/login" android:key="Login">
        <EditTextPreference android:persistent="true" android:title="@string/username" android:key="Username"></EditTextPreference>
        <EditTextPreference android:title="@string/password" android:persistent="true" android:password="true" android:key="Password"></EditTextPreference>
    </PreferenceScreen>
...
</PreferenceScreen>

该按钮应位于两个EditTextPreference的正下方.

The Button should be right under the two EditTextPreferences.

有没有针对此问题的简单解决方案?我发现的一个解决方案无法正常工作，因为我使用了PreferenceScreen s.

Is there a simple solution for this problem? The one solution I found was not working because I use sub PreferenceScreens.

我发现我可以这样添加按钮:

I figured out that i can add buttons this way:

<PreferenceScreen android:title="@string/login" android:key="Login">
        <EditTextPreference android:persistent="true" android:title="@string/username" android:key="Username"></EditTextPreference>
        <EditTextPreference android:title="@string/password" android:persistent="true" android:password="true" android:key="Password"></EditTextPreference>
        <Preference android:layout="@layout/loginButtons" android:key="loginButtons"></Preference>
</PreferenceScreen>

和布局文件(loginButtons.xml)看起来是这样的:

and the layout file (loginButtons.xml) looks that way:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:weightSum="10" 
    android:baselineAligned="false" android:orientation="horizontal">
    <Button android:text="Login" android:layout_width="fill_parent"
        android:layout_weight="5" android:layout_height="wrap_content"
        android:id="@+id/loginButton" android:layout_gravity="left"></Button>
    <Button android:text="Password?" android:layout_width="fill_parent"
        android:layout_weight="5" android:layout_height="wrap_content"
        android:id="@+id/forgottenPasswordButton"></Button>
</LinearLayout>

所以现在出现了按钮，但是我无法通过代码访问它们. 我用findViewById()尝试过，但是返回的是null.有什么想法可以访问这些按钮吗?

So now the buttons appear but I can't access them in code. I tried it with findViewById() but this is returning null. Any ideas how I could access these buttons?

推荐答案

对于xml:

<Preference android:title="Acts like a button"
                android:key="@string/myCoolButton"
                android:summary="This is a cool button"/>

然后在onCreate()

Preference button = findPreference(getString(R.string.myCoolButton));
button.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {   
                    //code for what you want it to do   
                    return true;
                }
            });

这看起来像是普通的首选项，只有标题和摘要，因此看起来像是它的所属.

This will appear like a normal Preference, with just a title and a summary, so it will look like it belongs.

我改为使用@string/myCoolButton和getString(R.string.myCoolButton)，因为最好是使用资源来提供编译器帮助，语言翻译和轻松地进行String更改.

I changed to using @string/myCoolButton and getString(R.string.myCoolButton) because it's best to use resources for compiler assistance, language translation, and ease of String changes.

这篇关于如何在PreferenceScreen中添加按钮?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！