SharedPreferences 数据存储

MainActivity.java代码

package cn.itcast.settings;import java.util.Map;import cn.itcast.service.PreferencesService;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private EditText nameText;    private EditText ageText;    private PreferencesService service;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        nameText = (EditText) this.findViewById(R.id.name);        ageText = (EditText) this.findViewById(R.id.age);        service = new PreferencesService(this);        Map<String, String> params = service.getPreferences();        nameText.setText(params.get("name"));        ageText.setText(params.get("age"));    }        public void save(View v){    String name = nameText.getText().toString();    String age = ageText.getText().toString();    service.save(name, Integer.valueOf(age));    Toast.makeText(getApplicationContext(), R.string.success, 1).show();    }        }

layout/main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/name"    />        <EditText    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:id="@+id/name"    />        <TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/age"    />        <EditText    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:numeric="integer"    android:id="@+id/age"    />        <Button     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/button"    android:onClick="save"    /></LinearLayout>

value/string.xml 配置文件

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, MainActivity!</string>    <string name="app_name">软件参数设置</string>    <string name="name">姓名</string>    <string name="age">年龄</string>    <string name="button">保存参数</string>    <string name="success">保存完成</string></resources>

核心操作类 PerferencesServer.java

package cn.itcast.service;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;public class PreferencesService {private Context context;public PreferencesService(Context context) {this.context = context;}/** * 保存参数 * @param name 姓名 * @param age 年龄 */public void save(String name, Integer age) {SharedPreferences preferences = context.getSharedPreferences("itcast", Context.MODE_PRIVATE);Editor editor = preferences.edit();editor.putString("name", name);editor.putInt("age", age);editor.commit();}/** * 获取各项配置参数 * @return */public Map<String, String> getPreferences(){Map<String, String> params = new HashMap<String, String>();SharedPreferences preferences = context.getSharedPreferences("itcast", Context.MODE_PRIVATE);params.put("name", preferences.getString("name", ""));params.put("age", String.valueOf(preferences.getInt("age", 0)));return params;}}

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