コード
詳しいことはコード内のコメントに書きましたので参照ください。
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, SettingsActivity.class));
}
});
}
@Override
protected void onStart() {
super.onStart();
RelativeLayout root = findViewById(R.id.root);
SharedPreferences defaultSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
switch (defaultSharedPreferences.getString("preference_theme", getString(R.string.default_value_preference_theme))) {
case "light":
root.setBackgroundColor(Color.parseColor("#FFFFFF"));
break;
case "dark":
root.setBackgroundColor(Color.parseColor("#000000"));
break;
}
}
}
activity_main.xml
xml version="1.0" encoding="utf-8"
<RelativeLayout
xmlnsandroid="http://schemas.android.com/apk/res/android"
xmlnstools="http://schemas.android.com/tools"
androidid="@+id/root"
androidlayout_width="match_parent"
androidlayout_height="match_parent"
toolscontext="com.hatenablog.mnoqlo.sampleapplication.MainActivity">
<Button
androidid="@+id/button"
androidlayout_width="wrap_content"
androidlayout_height="wrap_content"
androidlayout_centerHorizontal="true"
androidlayout_centerVertical="true"
androidgravity="center"
androidtext="設定画面を開く" />
</RelativeLayout>
SettingsActivity.java
public class SettingsActivity extends AppCompatActivity implements PreferenceFragmentCompat.OnPreferenceStartScreenCallback {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
if (savedInstanceState == null) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container, SettingsFragment.newInstance("preference_root"))
.commit();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onPreferenceStartScreen(PreferenceFragmentCompat caller, PreferenceScreen pref) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container, SettingsFragment.newInstance(pref.getKey()))
.addToBackStack(null)
.commit();
return true;
}
}
activity_settings.xml
xml version="1.0" encoding="utf-8"
<RelativeLayout
xmlnsandroid="http://schemas.android.com/apk/res/android"
xmlnstools="http://schemas.android.com/tools"
androidlayout_width="match_parent"
androidlayout_height="match_parent"
toolscontext="com.hatenablog.mnoqlo.sampleapplication.SettingsActivity">
<androidxappcompatwidgetToolbar
androidid="@+id/toolbar"
androidlayout_width="match_parent"
androidlayout_height="?attr/actionBarSize"
androidtheme="@style/ToolbarTheme" />
<FrameLayout
androidid="@+id/fragment_container"
androidlayout_width="match_parent"
androidlayout_height="match_parent"
androidlayout_below="@+id/toolbar" />
</RelativeLayout>
SettingsFragment.java
public class SettingsFragment extends PreferenceFragmentCompat {
public static SettingsFragment newInstance(String rootKey) {
SettingsFragment fragment = new SettingsFragment();
Bundle bundle = new Bundle();
bundle.putString(PreferenceFragmentCompat.ARG_PREFERENCE_ROOT, rootKey);
fragment.setArguments(bundle);
return fragment;
}
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.preferences, rootKey);
switch (rootKey) {
case "preference_appearance":
onCreateAppearancePreferences();
break;
case "preference_others":
break;
}
}
private void onCreateAppearancePreferences() {
ListPreference themePreference = (ListPreference) findPreference("preference_theme");
themePreference.setSummary(themePreference.getEntry());
themePreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
int indexOfValue = themePreference.findIndexOfValue(String.valueOf(newValue));
themePreference.setSummary(indexOfValue >= 0 ? themePreference.getEntries()[indexOfValue] : null);
return true;
}
});
}
@Override
public void onResume() {
super.onResume();
String rootKey = getArguments().getString(PreferenceFragmentCompat.ARG_PREFERENCE_ROOT);
getActivity().setTitle(findPreference(rootKey).getTitle());
}
}
preferences.xml
xml version="1.0" encoding="utf-8"
<PreferenceScreen
xmlnsandroid="http://schemas.android.com/apk/res/android"
androidtitle="設定"
androidkey="preference_root">
<PreferenceScreen
androidtitle="外観設定"
androidkey="preference_appearance">
<ListPreference
androidtitle="テーマ"
androidkey="preference_theme"
androidentries="@array/entries_preference_theme"
androidentryValues="@array/entry_values_preference_theme"
androiddefaultValue="@string/default_value_preference_theme" />
</PreferenceScreen>
<PreferenceScreen
androidtitle="その他の設定"
androidkey="preference_others">
<PreferenceScreen />
</PreferenceScreen>
</PreferenceScreen>
arrays.xml
xml version="1.0" encoding="utf-8"
<resources>
<string-array name="entries_preference_theme">
<item>ライト</item>
<item>ダーク</item>
</string-array>
<string-array name="entry_values_preference_theme">
<item>light</item>
<item>dark</item>
</string-array>
</resources>
strings.xml
xml version="1.0" encoding="utf-8"
<resources>
<string name="app_name">Sample Application</string>
<string name="default_value_preference_theme">light</string>
</resources>
styles.xml
xml version="1.0" encoding="utf-8"
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="ToolbarTheme" parent="ThemeOverlay.AppCompat.Dark.ActionBar">
<item name="android:background">@color/colorPrimary</item>
</style>
</resources>
build.gradle
/*
省略
*/
dependencies {
implementation 'androidx.preference:preference:最新バージョン'
}
androidxの方のバージョンはたぶんここ
Support Libraryの方のバージョンはたぶんここ
間違い等ありましたら、コメントしてくださると助かります🙏🙏
