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;
}
}
我明白了:
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$EditorImpl.commit(ContextImpl.java:2830)
07-03 09:46:22.563: E/AndroidRuntime(421): at com.centauri.equations.settings.SettingsActivity.onSharedPreferenceChanged(SettingsActivity.java:56)
07-03 09:46:22.563: E/AndroidRuntime(421):
当我致电editor.commit()
答案 0 :(得分:5)
您在commit()
- 方法中呼叫onSharedPreferenceChanged()
,当有人呼叫commit()
时,系统会调用此方法。这是一个无限循环。
这可以在堆栈跟踪中看到(查看行号):
at ...$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)
[...]
以下是Android Docs:
中的内容更改,添加或删除共享首选项时调用。这个 即使将偏好设置为其现有值,也可以调用。
Ergo,每次在commit()
- 对象上致电SharedPreferences
。
答案 1 :(得分:3)
onSharedPreferenceChanged
。但是在onSharedPreferenceChanged
内,您再次调用commit
,因此会导致无限循环。