Android设置Settings实现：PreferenceActivity【1】

╰+攻爆jí腚メ 2024-02-17 16:34 28阅读 0赞

**Android设置Settings实现：PreferenceActivity【1】**

Android的设置Settings功能比较常见，通常可以考虑使用PreferenceActivity实现。  
PreferenceActivity需要从res/xml加载（addPreferencesFromResource）一个定义好的Preference的xml文件。比如preferences.xml：

<?xml version="1.0" encoding="utf-8"?>
    <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
    
        <PreferenceCategory android:title="【第1组】" >
            <ListPreference
                android:dialogTitle="list dialog title"
                android:entries="@array/citys"
                android:entryValues="@array/citys"
                android:key="list_key"
                android:summary="list summary"
                android:title="list title" />
        </PreferenceCategory>
        <PreferenceCategory android:title="【第2组】" >
            <EditTextPreference
                android:defaultValue="缺省值1"
                android:key="edit_text_key_1"
                android:summary="edit summary"
                android:title="edit text 1" />
    
            <CheckBoxPreference
                android:defaultValue="true"
                android:key="checkbox_key"
                android:summary="checkbox summary"
                android:title="checkbox title" />
        </PreferenceCategory>
    
        
        <Preference
            android:summary="http://blog.csdn.net/zhangphil"
            android:title="浏览网页" >
            <intent
                android:action="android.intent.action.VIEW"
                android:data="http://blog.csdn.net/zhangphil" />
        </Preference>
    
        
        <PreferenceScreen
            android:key="preference_screen_2_key"
            android:persistent="false"
            android:title="PreferenceScreen 2" >
            <EditTextPreference
                android:defaultValue="缺省值2"
                android:key="edit_text_key_2"
                android:summary="edit summary"
                android:title="edit text 2" />
        </PreferenceScreen>
    
    </PreferenceScreen>

其中需要的数组资源citys在res/values中的arrays.xml中定义好：

<?xml version="1.0" encoding="utf-8"?>
    <resources>
        <string-array name="citys">
            <item>成都</item>
            <item>北京</item>
            <item>上海</item>
        </string-array>
        
    </resources>

上层Java代码：

package zhangphil.settings;
    
    import android.content.SharedPreferences;
    import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
    import android.os.Bundle;
    import android.preference.PreferenceActivity;
    import android.preference.PreferenceManager;
    import android.util.Log;
    import android.widget.Toast;
    
    public class MainActivity extends PreferenceActivity {
    
    	private MyOnSharedPreferenceChangeListener mOnSharedPreferenceChangeListener = new MyOnSharedPreferenceChangeListener();
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    
    		// 通用的读取设置的某个值的方法
    		SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    		String s = sharedPreferences.getString("edit_text_key_2", "暂时为空");
    		Log.d("edit_text_key_2", s);
    
    		// 添加设置的选项
    		addPreferencesFromResource(R.xml.preferences);
    
    		// 注册添加设置的项数据发生变化时候的监听
    		sharedPreferences.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
    	}
    
    	@Override
    	protected void onResume() {
    		super.onResume();
    		getPreferenceScreen().getSharedPreferences()
    				.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
    	}
    
    	@Override
    	protected void onPause() {
    		super.onPause();
    		getPreferenceScreen().getSharedPreferences()
    				.unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
    	}
    
    	private class MyOnSharedPreferenceChangeListener implements OnSharedPreferenceChangeListener {
    
    		@Override
    		public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    			Toast.makeText(getApplication(), key, Toast.LENGTH_SHORT).show();
    		}
    	}
    }

代码运行结果：

![Center][]

相关文档：  
Android谷歌官方Settings开发文档：[http://developer.android.com/guide/topics/ui/settings.html][http_developer.android.com_guide_topics_ui_settings.html]

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/c394a80ca97a4d50aa916ae656833aa5.png
[http_developer.android.com_guide_topics_ui_settings.html]: http://developer.android.com/guide/topics/ui/settings.html