如何设置edittext首选项摘要并保持不变 [英] How to set edittext preference summary and have it stick

问题描述

我在这方面倒退了第四，但我做不到.我正在使用首选项片段进行设置.我可以进行设置，甚至可以在进行更改时获取摘要"以进行更新.但是，如果我离开设置屏幕并返回到该屏幕，则摘要将恢复为默认文本.所以问题是，当使用edittext首选项时.您如何更新摘要，以便显示用户将设置更改为哪些内容，并使其在关闭屏幕和应用程序时始终存在?在这种情况下，当我的用户更改mse_ip时，摘要将更改为"MSE IP xxxx"，但是一旦我离开设置屏幕并返回，它又返回到"0.0.0.0"，这是@ string/mseip设置的位置.

I have gone back and fourth on this and I just can not get it. I am setting up my settings using a preference fragment. I can get the settings to work and I can even get the "summary" to update when I make the change. But if I leave the settings screen and come back to it, the summary is back to the default text. So the question is, when using an edittext preference. How do you update the summary so it shows what the user changed the setting to and make it stick across closing the screen and app? In this case when my users change the mse_ip the summary changes to "MSE IP x.x.x.x" but as soon as I leave the settings screen and come back it is back to "0.0.0.0" which is what @string/mseip is set to.

preferences.xml

preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">     
    <EditTextPreference
            android:key="mse_ip"
            android:title="MSE IP"
            android:summary="@string/mseip"
            android:defaultValue="0.0.0.0"
            android:dialogTitle="IP Address for mse" />
    <EditTextPreference
            android:key="mse_username"
            android:title="Username"
            android:summary="MSE Username %s"
            android:defaultValue="Admin"
            android:dialogTitle="Username for mse" />
    <EditTextPreference
            android:key="mse_password"
            android:title="MSE Password"
            android:password="true"
            android:summary="******"
            android:defaultValue="Admin"
            android:dialogTitle="Password for mse" />
</PreferenceScreen>

首选项片段

package com.hmkcode.android;

import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;

/*public class PrefsFragment extends PreferenceFragment {

 @Override
 public void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);

  // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);
 } 
} */
public class PrefsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Load the preferences from an XML resource
    addPreferencesFromResource(R.xml.preferences);

    // set texts correctly
    onSharedPreferenceChanged(null, "");

}

@Override
public void onResume() {
    super.onResume();
    // Set up a listener whenever a key changes
    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}

@Override
public void onPause() {
    super.onPause();
    // Set up a listener whenever a key changes
    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}

@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {

    updatePreference(key); }
     private void updatePreference(String key){
            if (key.equals("mse_ip")){
                Preference preference = findPreference(key);
                if (preference instanceof EditTextPreference){
                    EditTextPreference editTextPreference =  (EditTextPreference)preference;
                    if (editTextPreference.getText().trim().length() > 0){
                        editTextPreference.setSummary("MSE IP  " + editTextPreference.getText());
                    }else{
                        editTextPreference.setSummary("MSE IP Not");
                    }
                }
            }
        }

}

setpreferenceactivity

setpreferenceactivity

import android.os.Bundle;
import android.app.Activity;

public class SetPreferenceActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getFragmentManager().beginTransaction().replace(android.R.id.content,
            new PrefsFragment()).commit();

    //setContentView(R.layout.activity_set_preference);
}
 }

推荐答案

通过使用官方指南)，添加以下属性就足够了:

By using androidx preference library (see the official guides), adding the following attribute is enough:

<EditTextPreference
    ...
    app:useSimpleSummaryProvider="true" />

这篇关于如何设置edittext首选项摘要并保持不变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！