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=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context="com.example.sharedpreference.MainActivity" ><EditTextandroid:id="@+id/name"android:layout_width="fill_parent"android:hint="输入姓名"android:layout_height="wrap_content"/><EditTextandroid:id="@+id/age"android:layout_width="fill_parent"android:layout_height="wrap_content"android:hint="输入年龄"/><Buttonandroid:id="@+id/ok"android:layout_height="wrap_content"android:layout_width="fill_parent"android:text="确定"/></LinearLayout>
,为了一些琐事吵架,然后冷战,疯狂思念对方,最后和好。