SharedPreferences的简单使用

package com.example.sharedpreferences;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    
    TextView tv;
    Button read,write;
    SharedPreferences preferences;
    SharedPreferences.Editor editor;

    
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView)findViewById(R.id.tv);
        read = (Button)findViewById(R.id.read);
        write = (Button)findViewById(R.id.write);
        
        //声明preferences，通过getSharedPreferences方法得到，参数两个
        preferences = getSharedPreferences("test", MODE_WORLD_READABLE);
        
        //声明editor，通过preferences.edit()方法得到
        editor = preferences.edit();
        read.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                
                //得到日期
                String time = preferences.getString("time", null);
                
                //得到随机数
                int randNum = preferences.getInt("random", 0);
                String result = time == null ? "未写数据" : "the write time" + time
                        +"\n the randNum:" +randNum;
                tv.setText(result);
                
                
            }
        });
        write.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy年mm月dd日"
                +"hh:mm:ss");
                
                //放入日期
                editor.putString("time", sdf.format(new Date()));
                //放入一个随机数
                editor.putInt("random", (int)(Math.random()*100));
                
                //提交
                editor.commit();
                
            }
        });
        
    }

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

}

package com.example.sharedpreferences;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    
    TextView tv;
    Button read,write;
    SharedPreferences preferences;
    SharedPreferences.Editor editor;

    
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView)findViewById(R.id.tv);
        read = (Button)findViewById(R.id.read);
        write = (Button)findViewById(R.id.write);
        
        //声明preferences，通过getSharedPreferences方法得到，参数两个
        preferences = getSharedPreferences("test", MODE_WORLD_READABLE);
        
        //声明editor，通过preferences.edit()方法得到
        editor = preferences.edit();
        read.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                
                //得到日期
                String time = preferences.getString("time", null);
                
                //得到随机数
                int randNum = preferences.getInt("random", 0);
                String result = time == null ? "未写数据" : "the write time" + time
                        +"\n the randNum:" +randNum;
                tv.setText(result);
                
                
            }
        });
        write.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy年mm月dd日"
                +"hh:mm:ss");
                
                //放入日期
                editor.putString("time", sdf.format(new Date()));
                //放入一个随机数
                editor.putInt("random", (int)(Math.random()*100));
                
                //提交
                editor.commit();
                
            }
        });
        
    }

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

}

package com.example.sharedpreferences;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    
    TextView tv;
    Button read,write;
    SharedPreferences preferences;
    SharedPreferences.Editor editor;

    
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView)findViewById(R.id.tv);
        read = (Button)findViewById(R.id.read);
        write = (Button)findViewById(R.id.write);
        
        //声明preferences，通过getSharedPreferences方法得到，参数两个
        preferences = getSharedPreferences("test", MODE_WORLD_READABLE);
        
        //声明editor，通过preferences.edit()方法得到
        editor = preferences.edit();
        read.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                
                //得到日期
                String time = preferences.getString("time", null);
                
                //得到随机数
                int randNum = preferences.getInt("random", 0);
                String result = time == null ? "未写数据" : "the write time" + time
                        +"\n the randNum:" +randNum;
                tv.setText(result);
                
                
            }
        });
        write.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy年mm月dd日"
                +"hh:mm:ss");
                
                //放入日期
                editor.putString("time", sdf.format(new Date()));
                //放入一个随机数
                editor.putInt("random", (int)(Math.random()*100));
                
                //提交
                editor.commit();
                
            }
        });
        
    }

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

}