Question

我的偏好是这样的：

的settings.xml：

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

    <PreferenceCategory android:title="@string/sectionOneTitle" >
        <EditTextPreference
                android:title="@string/setModuleName"
                android:summary="@string/setModuleNameSum"
                android:key="moduleID"/>
    </PreferenceCategory>

    <PreferenceCategory android:title="@string/sectionTwoTitle" >
        <EditTextPreference
                android:title="@string/setPhoneNumber"
                android:summary="@string/setPhoneNumberSum"
                android:key="phoneNumber"/>
    </PreferenceCategory>

    <PreferenceCategory android:title="@string/sectionThreeTitle" >
        <CheckBoxPreference android:title="@string/setSmsSend"
            android:key="setSmsSend" android:summary="@string/setSmsSendSum" />
    </PreferenceCategory>

</PreferenceScreen>

设置活动

public class SettingsActivity extends PreferenceActivity {
    @SuppressWarnings("deprecation")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);
    }
}

现在我需要在设置或取消设置复选框时调用我的MAINActivity中的方法。这可能吗？

由于

Answer 1

为您的活动添加OnSharedPreferenceChangeListener：

import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
...

public class MAINActivity extends Activity {
    private OnSharedPreferenceChangeListener listener =
        new OnSharedPreferenceChangeListener() {
            @Override
            public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
                if (key.equals("setSmsSend") {
                    smsSendPrefChanged(); // the function you want called
                }
            }
        };

    @Override
    protected void onCreate() {
        super.onCreate();
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        prefs.registerOnSharedPreferenceChangeListener(listener);
        ...
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        prefs.unregisterOnSharedPreferenceChangeListener(listener);
        ...
    }

    ...
}

Answer 2

使用 PreferenceFragmentCompat

public class FragmentSettings
extends PreferenceFragmentCompat
implements SharedPreferences.OnSharedPreferenceChangeListener


@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {

    addPreferencesFromResource(R.xml.app_preferences);

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


@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {

    switch(key)
    {
        case "KEY1":
            // DO STUFF
            break;

        case "KEY2":
            // DO STUFF
            break;
    }
}

在Android中更改首选项后调用方法

2 个答案: