SharedPreferences(保存偏好参数)

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初次接触SharedPreferences，借助code-pig的博客写的小demo。实现每次打开app自动填充上次推出时输入的名字和年龄。

工具类SharedService

package com.example.sharedpreference;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.widget.Toast;public class SharedService {    private Context context ;    public SharedService(Context context) {        // TODO Auto-generated constructor stub        this.context = context ;    }        public void save(String name,String age) {        SharedPreferences sp = context.getSharedPreferences("base", Context.MODE_WORLD_READABLE) ;        Editor edit = sp.edit() ;        edit.putString("name", name) ;        edit.putString("age", age) ;        edit.commit() ;        Toast.makeText(context, "信息已经成功写入", Toast.LENGTH_LONG) ;    }        public Map<String,String> read() {        Map<String,String> map = new HashMap<String, String>() ;        SharedPreferences sp = context.getSharedPreferences("base", Context.MODE_WORLD_READABLE) ;        map.put("name", sp.getString("name", "")) ;        map.put("age", sp.getString("age", "")) ;        return map ;    }}

主activity

package com.example.sharedpreference;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;  import android.widget.Button;import android.widget.EditText;public class MainActivity extends ActionBarActivity {private EditText name ;private EditText age ;private Button ok ;private SharedService ss ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);this.name = (EditText) findViewById(R.id.name) ;this.age = (EditText)findViewById(R.id.age) ;this.ok = (Button) findViewById(R.id.ok) ;ss = new SharedService(this) ;this.name.setText(ss.read().get("name"));this.age.setText(ss.read().get("age"));this.ok.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubss.save(name.getText().toString(), age.getText().toString());}});}}

布局代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.sharedpreference.MainActivity" >   <EditText        android:id="@+id/name"       android:layout_width="fill_parent"       android:hint="输入姓名"       android:layout_height="wrap_content"/>      <EditText        android:id="@+id/age"       android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:hint="输入年龄"/>      <Button        android:id="@+id/ok"       android:layout_height="wrap_content"       android:layout_width="fill_parent"       android:text="确定"/></LinearLayout>

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