android数据存储SharedPreferences
1 使用SharedPreferences存储数据
2 文件存储数据
3 SQLite数据库存储数据
4 使用ContentProvider存储数据
5 网络存储数据
下面我们就讲讲使用SharedPreferences存储数据
<span style="font-size:18px;">package com.example.sharedpreferencedemo;
import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
private SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void save(View view){ <span style="color:#ff0000;"><strong>//数据存储</strong></span>
sharedPreferences=getSharedPreferences(this);<span style="color:#ff0000;"><strong>//this也可以换做("data", MODE_PRIVATE);</strong></span>
Editor editor=sharedPreferences.edit();
editor.putString("name", "zhupeng");<span style="color:#ff0000;"><strong>//以Map集合方式进行存储</strong></span>
editor.putInt("age", 12);
editor.putBoolean("rememberpassword", true);
editor.commit();
}
public void restore(View view){<strong><span style="color:#ff0000;">//数据读取</span></strong>
String name=sharedPreferences.getString("name", "");
int age=sharedPreferences.getInt("age", 10);
<span style="color:#ff0000;"><strong>//这里如果获取不到数据库里的值,则会以10代替</strong></span>
boolean booleanvalue=sharedPreferences.getBoolean("rememberpassword", true);
Log.d("MainActivity", "name"+name+"\n"+"age"+age+"\n"+booleanvalue+"\n");<span style="color:#ff0000;"><strong>//打印输出</strong></span>
}
}</span>
下面的activity.
xml布局
<span style="font-size:18px;"><span style="color:#333333;font-weight: bold;"><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/loginbg"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="@drawable/button_rectangle"
android:onClick="save" </span><span style="color:#ff0000;font-weight: bold;">//数据存储调用</span><span style="color:#333333;font-weight: bold;">
android:text="Save Data"
android:textColor="@android:color/white"
android:textSize="25sp" />
<Button
android:id="@+id/btnRestore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btnSave"
android:layout_below="@+id/btnSave"
android:layout_marginTop="25dp"
android:background="@drawable/button_rectangle"
android:onClick="restore" </span><span style="color:#ff0000;"><strong>//数据读取调用</strong></span><span style="color:#333333;font-weight: bold;">
android:text="Restore Data"
android:textColor="@android:color/white"
android:textSize="25sp" />
</RelativeLayout>
</span></span>
然后打开DDMs,找到
打开data,,,找到自己的那个包
会出现shared_prefs这个文件夹。里面就是刚才存储的数据。
这是UI界面