SettingFragment.java

package com.lq.fragment;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.PreferenceScreen;
import android.util.Log;

import com.lq.activity.FolderChooseActivity;
import com.lq.xpressmusic.R;
import com.lq.util.Constant;

/**
 * @author lq 2013-6-1 lq2625304@gmail.com
 * */
public class SettingFragment extends PreferenceFragment implements
		OnSharedPreferenceChangeListener {
	// 与其preference.xml中对应的preference标签的key相对应
	public static final String KEY_DOWNLOAD_LYRIC_AUTOMATICALLY = "key_download_lyric_automatically";
	public static final String KEY_LYRIC_SAVE_PATH = "key_lyric_save_path";
	public static final String KEY_RESET_TO_DEFAULT = "key_reset_to_default";
	public static final String KEY_FILTER_BY_SIZE = "key_filter_by_size";
	public static final String KEY_FILTER_BY_DURATION = "key_filter_by_duration";

	private static final String TAG = SettingFragment.class.getSimpleName();
	private Preference mLyricSavePathPreference = null;

	@Override
	public void onAttach(Activity activity) {
		Log.i(TAG, "onAttach");
		super.onAttach(activity);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		Log.i(TAG, "onCreate");
		super.onCreate(savedInstanceState);

		// 加载配置文件
		addPreferencesFromResource(R.xml.system_preference);

		// 获得歌词保存路径偏好设置对象
		mLyricSavePathPreference = getPreferenceScreen().findPreference(
				KEY_LYRIC_SAVE_PATH);

	}

	@Override
	public void onResume() {
		Log.i(TAG, "onResume");
		super.onResume();

		// 注册偏好变化监听器，以便更新当前内容
		getPreferenceScreen().getSharedPreferences()
				.registerOnSharedPreferenceChangeListener(this);

		// 显示歌词保存路径
		String summary = getPreferenceScreen()
				.getSharedPreferences()
				.getString(KEY_LYRIC_SAVE_PATH, Constant.LYRIC_SAVE_FOLDER_PATH);
		mLyricSavePathPreference.setSummary(summary);
	}

	@Override
	public void onPause() {
		Log.i(TAG, "onPause");
		super.onPause();
		getPreferenceScreen().getSharedPreferences()
				.unregisterOnSharedPreferenceChangeListener(this);
	}

	@Override
	public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
			Preference preference) {
		Log.i(TAG, "onPreferenceTreeClick");
		if (preference.getKey().equals(KEY_RESET_TO_DEFAULT)) {
			// TODO 恢复默认设置,清空sharedPreference
			PreferenceManager.getDefaultSharedPreferences(getActivity()).edit()
					.clear().commit();
			getActivity().finish();
			return true;
		} else if (preference.getKey().equals(KEY_LYRIC_SAVE_PATH)) {
			startActivity(new Intent(getActivity(), FolderChooseActivity.class));
		}
		return super.onPreferenceTreeClick(preferenceScreen, preference);
	}

	@Override
	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
			String key) {
		if (key.equals(KEY_LYRIC_SAVE_PATH)) {
			// 更新歌词保存路径的显示
			mLyricSavePathPreference.setSummary(sharedPreferences.getString(
					KEY_LYRIC_SAVE_PATH, Constant.LYRIC_SAVE_FOLDER_PATH));
		}
	}
}