Android学习【10】PreferenceFragment偏好设置(二)

上一篇讲述了PreferenceFragment中的各种控件，接下来为各个控件添加监听事件。。。。

主要实现了3个接口OnPreferenceClickListener，OnSharedPreferenceChangeListener和OnPreferenceChangeListener。

onPreferenceClick为点击事件，当点击Preference控件后将触发该方法。但是EditTextPreference等修改内容后再次确认时，不会调用该方法。为了解决这一问题，onSharedPreferenceChanged登场了。当Preference控件内容发生改变时，将触发该方法。最后onPreferenceChange方法用于MultiSelectList和Ringtone的调用。

细节就直接上代码啦，这样比较清楚。。。

public class SettingFragment extends PreferenceFragment implements Preference.OnPreferenceClickListener, SharedPreferences.OnSharedPreferenceChangeListener,Preference.OnPreferenceChangeListener {    private CheckBoxPreference checkbox;    private EditTextPreference edittext;    private MultiSelectListPreference MultiSelectList;    private ListPreference list;    private RingtonePreference Ringtone;    private SwitchPreference Switch;    private Preference preference;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.setting);        //根据key值找到控件        checkbox = (CheckBoxPreference) findPreference("checkbox");        edittext = (EditTextPreference) findPreference("edittext");        MultiSelectList = (MultiSelectListPreference)findPreference("MultiSelectList");        list = (ListPreference)findPreference("list");        Ringtone = (RingtonePreference) findPreference("Ringtone");        Switch = (SwitchPreference) findPreference("switch");        // 设置监听器        checkbox.setOnPreferenceClickListener(this);        edittext.setOnPreferenceClickListener(this);        Ringtone.setOnPreferenceClickListener(this);        MultiSelectList.setOnPreferenceChangeListener(this);        Ringtone.setOnPreferenceChangeListener(this);        // 得到我们的存储Preferences值的对象，然后对其进行相应操作        SharedPreferences shp = PreferenceManager.getDefaultSharedPreferences(this.getActivity());        boolean apply_Checked = shp.getBoolean("checkbox", false);        //获取历史设置        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this.getActivity());        edittext.setSummary(sp.getString("edittext", ""));    }    @Override    // 点击事件触发    public boolean onPreferenceClick(Preference preference) {        // 对控件进行操作        if (preference == checkbox) {            Toast.makeText(this.getActivity(), " 点击了checkbox :" + checkbox.isChecked(), Toast.LENGTH_SHORT).show();        } else if (preference == edittext) {            edittext.setText("");            Toast.makeText(this.getActivity(), " 点击了edittext :" + edittext.getText(), Toast.LENGTH_SHORT).show();        } else if (preference == Ringtone) {            Toast.makeText(this.getActivity(), " 点击了Ringtone :" + Ringtone.getRingtoneType(), Toast.LENGTH_SHORT).show();        }        return true;    }    //当Preference发生变化时调用    @Override    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {        if (key.equals("edittext")) {            edittext.setSummary(edittext.getText());        }        if (key.equals("list")) {            list.setSummary(list.getValue());        }        if(key.equals("Ringtone")){            Ringtone.setSummary(Ringtone.getRingtoneType());        }        if(key.equals("switch")){            Switch.setSummary(String.valueOf(Switch.isChecked()));        }    }    @Override    public void onResume() {        super.onResume();        //注册事件        getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);    }    @Override    public void onPause() {        //注销事件        getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);        super.onPause();    }    @Override    public boolean onPreferenceChange(Preference preference, Object newValue) {        if (preference == MultiSelectList) {            MultiSelectList.setSummary(newValue.toString());            return true;        }        if (preference == Ringtone) {            Ringtone.setSummary(newValue.toString());            return true;        }        return false;    }}

源码戳这里