Android数据存储之Shared Preferences

1.编辑strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, Data_SharedPreferencesActivity!</string>    <string name="app_name">Data_SharedPreferences</string>    <string name="tvName">姓名</string>    <string name="tvAge">年龄</string>    <string name="btSet">设置</string>    <string name="btRead">读取</string>    <string name="saveSuccess">保存成功</string>    <string name="saveFiled">保存失败</string></resources>

2.编辑main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >        //姓名     <RelativeLayout      android:layout_width="fill_parent"     android:layout_height="wrap_content">    <TextView        android:id="@+id/tvName"         android:layout_width="25pt"         android:layout_height="wrap_content"        android:text="@string/tvName"/>            <EditText        android:id="@+id/etName"         android:layout_width="300pt"         android:layout_height="wrap_content"         android:inputType="text"        android:layout_toRightOf="@id/tvName"/></RelativeLayout>            //年龄      <RelativeLayout      android:layout_width="fill_parent"     android:layout_height="wrap_content">    <TextView        android:id="@+id/tvAge"         android:layout_width="25pt"         android:layout_height="wrap_content"        android:text="@string/tvAge"/>            <EditText        android:id="@+id/etAge"         android:layout_width="300pt"         android:layout_height="wrap_content"         android:inputType="text"        android:layout_toRightOf="@id/tvAge"/>               //etAge位于tvAge的右边           </RelativeLayout>        //按钮        <RelativeLayout      android:layout_width="fill_parent"     android:layout_height="wrap_content">    <Button        android:id="@+id/btSet"         android:layout_width="50pt"         android:layout_height="wrap_content"        android:text="@string/btSet"/>            <Button        android:id="@+id/btRead"         android:layout_width="50pt"         android:layout_height="wrap_content"         android:layout_toRightOf="@id/btSet"       android:text="@string/btRead"/></RelativeLayout> </LinearLayout>

3.编辑Data_SharedPreferencesActivity.java

package wei.cao.data;import android.app.Activity;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class Data_SharedPreferencesActivity extends Activity {private EditText etName;private EditText etAge;private Button btRead;private Button btSet;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                //获取按钮和编辑框        etName=(EditText)this.findViewById(R.id.etName);        etAge=(EditText)this.findViewById(R.id.etAge);        btRead=(Button)this.findViewById(R.id.btRead);        btSet=(Button)this.findViewById(R.id.btSet);                 //添加事件        btSet.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {//获取输入的姓名和年龄String name=etName.getText().toString();String age=etAge.getText().toString();//取得活动的Preferences对象SharedPreferences sp=getPreferences(Activity.MODE_PRIVATE);//取得编辑对象Editor editor=sp.edit();//添加值editor.putString("name", name);editor.putInt("age", Integer.parseInt(age));                                //保存数据                                if(editor.commit()){Toast.makeText(Data_SharedPreferencesActivity.this, R.string.saveSuccess, 1).show();}else{Toast.makeText(Data_SharedPreferencesActivity.this, R.string.saveFiled, 1).show();}}});                btRead.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {//创建SharedPreferences对象SharedPreferences sp=getPreferences(MODE_PRIVATE);//获取数据(第二个参数代表,如果没有找到name,那么name的值就为defaultName,)//就是把name改为na,那么name的值就是defaultNameString name=sp.getString("name", "defaultName");String age=sp.getInt("age", 0)+"";//显示数据String result="name:"+name+"===age:"+age;Toast.makeText(Data_SharedPreferencesActivity.this, result, 1).show();}});                    }}

4.执行结果:

5.打开DDMS的File Explore 在data/data/wei.cao.data会产生一个文件,
导出后的结果为:

<?xml version='1.0' encoding='utf-8' standalone='yes' ?><map><string name="name">qwe</string><int name="age" value="12" /></map>