Android之使用SharedPreferences保存用户偏好参数

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context=".MainActivity" >
10 <EditText 
11     android:layout_width="fill_parent"
12     android:layout_height="wrap_content"
13     android:id="@+id/account"
14     />
15 <EditText 
16     android:layout_width="fill_parent"
17     android:layout_height="wrap_content"
18     android:id="@+id/password"
19     android:layout_below="@id/account"
20     />
21 <Button 
22         android:layout_width="fill_parent"
23         android:layout_height="wrap_content"
24         android:layout_below="@id/password"
25         android:text="保存参数"
26         android:id="@+id/save"
27         android:onClick="save"
28  />
29 </RelativeLayout>

 1 import android.R.integer;
 2 import android.content.Context;
 3 import android.content.SharedPreferences;
 4 import android.content.SharedPreferences.Editor;
 5 import android.widget.EditText;
 6 
 7 public class Preferences {
 8 
 9     private Context context;
10     public Preferences(Context context)
11     {
12         this.context=context;
13     }
14     
15     
16     public void save(String name, Integer valueOf) 
17     {
18         //保存文件名字为"shared",保存形式为Context.MODE_PRIVATE即该数据只能被本应用读取
19         SharedPreferences preferences=context.getSharedPreferences("shared",Context.MODE_PRIVATE);
20         
21         Editor editor=preferences.edit();
22         editor.putString("name", name);
23         editor.putInt("age", valueOf);
24         
25         editor.commit();//提交数据
26     }
27 
28 
29 }

import java.util.HashMap;
import java.util.Map;

import android.R.integer;
import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    private EditText account,passworad;
    Preferences prefer;//自定义的类
    SharedPreferences preference; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        account=(EditText)findViewById(R.id.account);
        passworad=(EditText)findViewById(R.id.password);
        
        //获取本地的数据
       preference=getSharedPreferences("shared", MODE_PRIVATE);
        Map<String, String> map=new HashMap<String, String>();
        map.put("name",preference.getString("name",""));
        map.put("age", String.valueOf(preference.getInt("age", 0)));        
        account.setText(map.get("name"));
        passworad.setText(map.get("age"));
        
    }

    //保存文件的方法
    public void save(View v) {
    String name=account.getText().toString();
    String age=passworad.getText().toString();
    prefer=new Preferences(this);
    prefer.save(name,Integer.valueOf(age));
    Toast.makeText(getApplicationContext(), "保存完成", Toast.LENGTH_SHORT).show();

    }
    
     @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}