在Android中使用主题

Question

Im trying to switch between Holo.Light and Holo (Dark) so everything in my application is changed to the theme the user sets in the preferences.

I've been looking at a few open source apps that this is done in and cant seem to make it work with my project, Any help on this would be greately appreciated.

The Current ISSUE im running into inside DashboardActivity.java is:

"I've having issues with "setTheme(Integer.parseInt( pref.getString("

DashboardActivity (Updated)

public class DashboardActivity extends Activity {

public static final int THEME_BLACK = R.style.DarkThemeAndroid;
public static final int THEME_WHITE = R.style.LightThemeAndroid;
public static final int THEME_WHITE_BLACK = android.R.style.Theme_Holo_Light_DarkActionBar;

@Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
            // I've having issue with the "pref.getString" i've tried "Settings.getString" and get error about needing a getString method is needed in Settings.java
    setTheme(Integer.parseInt( pref.getString("selectedTheme", String.valueOf(R.style.LightThemeAndroid) )));
    setContentView(R.layout.dashboard_layout);
          // the rest of my code
      )
    )

Settings (Updated)

public class Settings extends PreferenceActivity implements
    OnSharedPreferenceChangeListener {

final static String[] mThemeEntries = {
    "Default (Light)", 
    "Dark"
    };
final static String[] mThemeValues = {  
    String.valueOf(R.style.LightThemeAndroid), 
    String.valueOf(R.style.DarkThemeAndroid)
    };
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Loads the XML preferences file.
    addPreferencesFromResource(R.xml.settings);
//  SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);


    ListPreference listPref = (ListPreference)findPreference("selectedTheme");

    listPref.setEntries(mThemeEntries);
    listPref.setEntryValues(mThemeValues);

    listPref.setValue( pref.getString("selectedTheme", String.valueOf(mThemeValues[0]) ) );

XML Resources

Themes.xml

 <style name="LightThemeAndroid" parent="android:style/Theme.Holo.Light"> 
   </style>         

 <style name="DarkThemeAndroid" parent="android:style/Theme.Holo">
   </style>

Settings.xml

  <ListPreference
android:title="Themes"
android:summary="Change the UI of the application"
android:key="theme"
android:entries="@array/themesReturnValue"
android:entryValues="@array/themesDisplayWord" 
android:defaultValue="Theme1" />

Arrays.xml

 <string-array name="themesReturnValue">
   <item>Light</item>
    <item>Dark</item>
    <item>LightActionBar</item>
         </string-array>   
<string-array name="themesDisplayWord">
    <item>Theme1</item>
    <item>Theme2</item>
    <item>Theme3</item>
        </string-array>

Answer 1

getTheme() is a non-static method and you are trying to call it in a static way (not from an instance variable). You need an instance of the object to call the non-static method. Also, the docs state

Note that this should be called before any views are instantiated in the Context (for example before calling setContentView(View) or inflate(int, ViewGroup)).

Docs

Answer 2

There exists non-static getTheme() method of the ContextThemeWrapper class that returns Theme object type. Change the name of the getTheme() method to a different one for example getThe() and you should be fine.

Answer 3

First like codeMagic said, you are calling getTheme in a non-static way, I would also put the theme related constants in 1 class. Try making getTheme a static method (Although i would probably create a seperate class just for theme). Apart from that, here is a solution I was working on 2 days ago as i couldn't find anywhere on google or here for an answer to a more dynamic fluid theme preference.

I start off with my preference fragment (in your case, activity). Then declare the themes and values into an array...

public class LayoutFragment extends PreferenceFragment {

final static String[] mThemeEntries = {
    "Default (Light)", 
    "Dark"
    };
final static String[] mThemeValues = {  
    String.valueOf(R.style.Theme_Default), 
    String.valueOf(R.style.Theme_Dark)
    };

then in my oncreate method, i set these values (note, in the xml i do not set these values and there are no references to those values in the xml files)

    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);                 
    addPreferencesFromResource(R.xml.pref_layout);
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());

    ListPreference listPref = (ListPreference)findPreference("selectedTheme");

    listPref.setEntries(mThemeEntries);
    listPref.setEntryValues(mThemeValues);

    listPref.setValue( pref.getString("selectedTheme", String.valueOf(mThemeValues[0]) ) );

}

Notice that i had converted these values to a string, dont ask why, but i was getting a whole lot of trouble trying to store the int value of those resource id's (this is also why xml values was not an option)...

now when ever i need to set a theme from the user preference... I just call

setTheme(Integer.parseInt( pref.getString("selectedTheme", String.valueOf(R.style.Theme_Default) )));

and off course you could provide a static method somewhere to do the castings etc without writing it for each activity.

EDIT: You don't need the array's to be static, I must off left them like that while I was trying different things to get it to work.