2 
public class SettingsActivity extends SherlockPreferenceActivity implements OnSharedPreferenceChangeListener, OnPreferenceChangeListener {
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);

        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);

        ListPreference theme = (ListPreference) getPreferenceScreen().findPreference("theme");
        theme.setSummary(theme.getValue().toString());
        theme.setOnPreferenceChangeListener(this);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        getSupportActionBar().setTitle(R.string.menu_preferences);
    }

    @SuppressWarnings("deprecation")
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
        String key) {
        if (key.equals("theme")) {
            SharedPreferences.Editor editor = sharedPreferences.edit();
            ListPreference theme = (ListPreference) getPreferenceScreen().findPreference("theme");
            theme.setSummary(theme.getEntry());
            editor.putString("theme", theme.getEntry().toString());
            editor.commit();
        }
    }

    public boolean onPreferenceChange(Preference preference, Object newValue) {
        ListPreference theme = (ListPreference) preference;
        theme.setSummary(theme.getEntry());
        return true;
    }
}

私はこれを手に入れます：

07-03 09:46:22.563: E/AndroidRuntime(421): java.lang.StackOverflowError
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.BaseByteBuffer.<init>(BaseByteBuffer.java:26)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:49)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:41)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.ReadWriteHeapByteBuffer.<init>(ReadWriteHeapByteBuffer.java:43)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.BufferFactory.newByteBuffer(BufferFactory.java:38)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.ByteBuffer.wrap(ByteBuffer.java:82)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.charset.CharsetEncoder.isLegalReplacement(CharsetEncoder.java:646)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.charset.CharsetEncoder.replaceWith(CharsetEncoder.java:752)
07-03 09:46:22.563: E/AndroidRuntime(421):  at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:184)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.ibm.icu4jni.charset.CharsetEncoderICU.<init>(CharsetEncoderICU.java:75)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.ibm.icu4jni.charset.CharsetICU.newEncoder(CharsetICU.java:74)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.android.internal.util.FastXmlSerializer.setOutput(FastXmlSerializer.java:292)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:181)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl.writeFileLocked(ContextImpl.java:2889)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl.access$300(ContextImpl.java:2637)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2822)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):  at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421):  at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):

このエラーは、電話をかけると発生しますeditor.commit()

4

2 に答える 2

5

誰かが を呼び出したときに呼び出される -メソッドを呼び出しcommit()ています。無限ループです。onSharedPreferenceChanged()commit()

これは、スタック トレースで確認できます (行番号を見てください)。

at ...$EditorImpl.commit(ContextImpl.java:2822)
at ...SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
at ...$EditorImpl.commit(ContextImpl.java:2822)
at ...SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
at ...$EditorImpl.commit(ContextImpl.java:2822)
at ...SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
[...]

Android Docsの一部を次に示します。

共有設定が変更、追加、または削除されたときに呼び出されます。これは、設定が既存の値に設定されている場合でも呼び出される場合があります。

commit()したがって、SharedPreferences-objectを呼び出すたびに。

于 2012-07-03T13:57:44.390 に答える
3

onSharedPreferenceChangedコミット時に呼び出されます。しかし、内部onSharedPreferenceChangedで再度呼び出すcommitため、無限ループが発生しています。

于 2012-07-03T13:58:14.563 に答える