SharedPreferences 首选项使用实例

ch9share.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="这是一个首选项SharedPreference示例"/>    <TextView android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="输入用户名:"/>    <EditText android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/user"/>    <Button android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/bt_OK"        android:text="确定"        android:gravity="center_horizontal"/>    <TextView android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="首选项的设置为:"/>    <TextView android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/tv"/></LinearLayout>

在res/xml/目录下创建ch9preference.xml：

<?xml version="1.0" encoding="UTF-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"    android:key="setting"    android:title="软件设置">    <PreferenceCategory         android:key="basicSet"        android:title="基本设置">        <EditTextPreference android:key="username"            android:title="账户"            android:defaultValue=""            android:summary="设置账户名"/>        <CheckBoxPreference android:key="nightmode"            android:title="夜间模式"            android:summaryOn="已启用"            android:summaryOff="未启用"/>        <RingtonePreference             android:key="ringtone"            android:title="铃声"            android:showSilent="true"            android:ringtoneType="alarm"            android:summary="设置通知铃声"/>    </PreferenceCategory>    <PreferenceCategory android:key="textSet"        android:title="本文设置">        <ListPreference android:key="fontSize"            android:title="字体大小"            android:summary="设置字体大小"            android:entries="@array/fontsize"            android:entryValues="@array/fontsizevalue"            android:dialogTitle="选择字体大小"/>    </PreferenceCategory></PreferenceScreen>

编写string资源文件，string.xml:

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">BaseExample</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="a">假如给我三天光明</string>    <string name="b">百年孤独</string>    <string name="c">童年</string>    <string name="d">四大名著</string>    <string name="e">钢铁是怎样炼成的</string>    <string name="f">城南旧事</string>        <string-array name="fontsize">        <item>小</item>        <item>正常</item>        <item>大</item>    </string-array>    <string-array name="fontsizevalue">        <item>0</item>        <item>1</item>        <item>2</item>    </string-array>    </resources>

创建首选项的活动类，SetPreferenceActivity.java:

package com.example.ch9;import com.example.baseexample.R;import android.os.Bundle;import android.preference.PreferenceActivity;public class SetPreferenceActivity extends PreferenceActivity {public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);addPreferencesFromResource(R.xml.ch9preference);}}

主类SharedPreferencesActivity.java:

package com.example.ch9;import java.util.Iterator;import java.util.Map;import java.util.Set;import com.example.baseexample.R;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class SharedPreferencesActivity extends Activity {private TextView tv;private EditText edtUser;private Button bt_OK;private SharedPreferences pref;public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.ch9share);edtUser = (EditText)findViewById(R.id.user);bt_OK = (Button)findViewById(R.id.bt_OK);bt_OK.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {pref = getSharedPreferences("com.example.baseexample_preferences",MODE_WORLD_READABLE);Editor editor = pref.edit();String userName = edtUser.getText().toString();editor.putString("username", userName);editor.commit();showSetting();}});}public boolean onCreateOptionsMenu(Menu menu){menu.add(Menu.NONE,Menu.FIRST+1,1,"设置");menu.add(Menu.NONE,Menu.FIRST+2,2,"退出");return true;}public boolean onOptionsItemSelected(MenuItem item){switch(item.getItemId()){case Menu.FIRST+1:Intent intent = new Intent();intent.setClass(this, SetPreferenceActivity.class);startActivityForResult(intent, 1);break;case Menu.FIRST+2: finish();break;}return super.onOptionsItemSelected(item);}protected void onActivityResult(int requestCode,int resultCode,Intent data){super.onActivityResult(requestCode, resultCode, data);showSetting();}private void showSetting(){String settingStr;tv = (TextView)findViewById(R.id.tv);pref = getSharedPreferences("com.example.ch9_preferences",MODE_WORLD_READABLE);String username=pref.getString("username", "");settingStr = "您设置的账户名为:"+username+"\n";Boolean nightmode = pref.getBoolean("nightmode", false);if(nightmode){settingStr = settingStr +"夜间模式：已启用\n";}else{settingStr = settingStr +"夜间模式：未启用\n";}String fontSize = pref.getString("fontSize", "2");if(fontSize.equals("0")){settingStr = settingStr+"字体：小"+"\n";}else if(fontSize.equals("1")){settingStr = settingStr+"字体：正常"+"\n";}else if(fontSize.equals("2")){settingStr = settingStr+"字体：大"+"\n";}tv.setText(settingStr);Map<String, Object> map = (Map<String, Object>) pref.getAll();Set<String> s = map.keySet();Iterator<String> iterator = s.iterator();while(iterator.hasNext()){System.out.println(iterator.next());}}}