Question

我正在尝试使用PreferenceActivity创建设置活动。但是，在我点击设置选项后，设置活动没有加载，而是保持在我尝试加载它的同一活动中。

对此问题的任何帮助表示赞赏。

感谢。

以下是SettingsActivity代码：

package com.example.android.sunshine.app;

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


public class SettingsActivity extends PreferenceActivity
    implements Preference.OnPreferenceChangeListener {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Add 'general' preferences, defined in the XML file
    // TODO: Add preferences from XML

    // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
    // updated when the preference changes.
    // TODO: Add preferences
}

/**
 * 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;
}

}

我还使用AndroidManifest.xml更新了SettingsActivity：

<activity
        android:name=".SettingsActivity"
        android:label="@string/title_activity_settings"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".MainActivity"/>
    </activity>

Answer 1

您需要从MainActivity中调用它

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {

        case R.id.menu_settings:
            Intent i = new Intent(MainActivity.this, SettingsActivity.class);
            startActivityForResult(i, 1);
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

这是我的main_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

<item
    android:id="@+id/menu_settings"
    android:icon="@android:drawable/ic_menu_agenda"
    android:orderInCategory="100"
    android:title="Settings"
    app:showAsAction="never|withText" /></menu>

Android设置活动未显示

1 个答案: