java - 由以下原因引起:java.lang.ClassCastException:com.example.mayank.sunshine.SettingsActivity无法转换为android.app.Activity

package com.example.mayank.sunshine;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;

/**
 * A {@link PreferenceActivity} that presents a set of application settings.
 * <p>
 * See <a href="http://developer.android.com/design/patterns/settings.html">
 * Android Design: Settings</a> for design guidelines and the <a
 * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
 * API Guide</a> for more information on developing a Settings UI.
 */
public class SettingsActivity extends PreferenceFragment
        implements Preference.OnPreferenceChangeListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Add 'general' preferences, defined in the XML file
        addPreferencesFromResource(R.xml.pref_general);

        // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
        // updated when the preference changes.
        bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_location_key)));
    }

    /**
     * Attaches a listener so the summary is always updated with the preference value.
     * Also fires the listener once, to initialize the summary (so it shows up before the value
     * is changed.)
     */
    private void bindPreferenceSummaryToValue(Preference preference) {
        // Set the listener to watch for value changes.
        preference.setOnPreferenceChangeListener(this);

        // Trigger the listener immediately with the preference's
        // current value.
        onPreferenceChange(preference,
                PreferenceManager
                        .getDefaultSharedPreferences(preference.getContext())
                        .getString(preference.getKey(), ""));
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
        String stringValue = value.toString();

        if (preference instanceof ListPreference) {
            // For list preferences, look up the correct display value in
            // the preference's 'entries' list (since they have separate labels/values).
            ListPreference listPreference = (ListPreference) preference;
            int prefIndex = listPreference.findIndexOfValue(stringValue);
            if (prefIndex >= 0) {
                preference.setSummary(listPreference.getEntries()[prefIndex]);
            }
        } else {
            // For other preferences, set the summary to the value's simple string representation.
            preference.setSummary(stringValue);
        }
        return true;
    }

}

上面的代码显示以下错误：
由以下原因引起：java.lang.ClassCastException：com.example.mayank.sunshine.SettingsActivity无法转换为android.app.Activity

先前的代码具有“ SettingsActivity扩展了PreferenceActivity”，但是某些功能显示为已弃用，我被引导改为使用PreferenceFragment类，因此在更改父类时，错误开始出现。此外，清单文件的以下部分显示了android中的错误：name =“。SettingsActivity”

<activity
    android:name=".SettingsActivity"
    android:label="@string/title_activity_settings"
    android:parentActivityName=".MainActivity"
    android:theme="@style/AppTheme.NoActionBar" >
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="com.example.mayank.sunshine.MainActivity" />
</activity>

最佳答案

上面的代码显示以下错误：由以下原因引起：java.lang.ClassCastException：com.example.mayank.sunshine.SettingsActivity无法转换为android.app.Activity


那是因为您的SettingsActivity在其继承链中没有Activity。 SettingsActivity从Fragment继承，而Object从PreferenceActivity继承。


以前的代码具有“ SettingsActivity扩展PreferenceActivity”，但是在较新的API中不推荐使用此类


在API级别23中，任何版本的Android中均不推荐使用。