Android开发_Sharedpreferences_存储数据使用方法_完整Demo_AndroidStudio

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项目完整压缩包：http://download.csdn.net/detail/iwanghang/9606408

manifests.xml：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.iwanghang.sharedpreferencesdemo">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

MainActivity.java：

package com.iwanghang.sharedpreferencesdemo;import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import java.util.Map;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        /**         * 任意key及对应value写入，全部key和value读取         */        final EditText editText_key = (EditText) findViewById(R.id.editText_key);        final EditText editText_value = (EditText) findViewById(R.id.editText_value);        Button button_write = (Button) findViewById(R.id.button_write);        Button button_read_all = (Button) findViewById(R.id.button_read_all);        /**         * name的value写入，name的value读取         */        final EditText editText_name = (EditText) findViewById(R.id.editText_name);        Button button_write_name = (Button) findViewById(R.id.button_write_name);        Button button_read_name = (Button) findViewById(R.id.button_read_name);        /**         * age的value写入，age的value读取         */        final EditText editText_age = (EditText) findViewById(R.id.editText_age);        Button button_write_age = (Button) findViewById(R.id.button_write_age);        Button button_read_age = (Button) findViewById(R.id.button_read_age);        /**         * 内容显示         */        final TextView textView_content = (TextView) findViewById(R.id.textView_content);        //1、获取SharedPreferences对象。SharedPreferences是一个接口，程序无法直接创建SharedPreferences对象，只能通过Context提供的getSharedPreferences()方法。        final SharedPreferences preference = getSharedPreferences("test", MODE_PRIVATE);        //2、获取SharedPreferences。Editor对象，用于写数据。本步骤只对写数据有必要。        final SharedPreferences.Editor editor = preference.edit();        button_write.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                String key = editText_key.getText().toString().trim();                String value = editText_value.getText().toString().trim();                //3、写入数据并commit。                editor.putString(key, value);                editor.commit();            }        });        /**         *  读取所有数据         */        button_read_all.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                String content = "";                Map<String, ?> allContent = preference.getAll();                // 注意遍历map的方法                for(Map.Entry<String, ?>  entry : allContent.entrySet()){                    content += ("key:" + entry.getKey()+ "=" +entry.getValue() + ", ");                }                textView_content.setText(content);            }        });        /**         *  name写入         */        button_write_name.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                String key = "name";                String value = editText_name.getText().toString().trim();                //3、写入数据并commit。                editor.putString(key, value);                editor.commit();            }        });        /**         *  name读取         */        button_read_name.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                String content = preference.getString("name", "null");                textView_content.setText(content);            }        });        /**         *  age写入         */        button_write_age.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                String key = "age";                String value = editText_age.getText().toString().trim();                //3、写入数据并commit。                editor.putString(key, value);                editor.commit();            }        });        /**         *  age读取         */        button_read_age.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                String content = preference.getString("age", "17");                textView_content.setText(content);            }        });    }}

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <!-- 写入任意key -->    <LinearLayout        android:id="@+id/write_key_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <TextView            android:id="@+id/insert_text_setOut"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="请输入任意key："            android:textSize="20dp" />        <EditText            android:id="@+id/editText_key"            android:layout_width="fill_parent"            android:layout_height="wrap_content" />    </LinearLayout>    <!-- 写入任意value -->    <LinearLayout        android:id="@+id/write_value_layout"        android:layout_below="@+id/write_key_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <TextView            android:id="@+id/insert_text_setOut2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="请输入对应value："            android:textSize="20dp" />        <EditText            android:id="@+id/editText_value"            android:layout_width="fill_parent"            android:layout_height="wrap_content" />    </LinearLayout>    <!-- 写入读取按钮 -->    <RelativeLayout        android:id="@+id/write_read_layout"        android:layout_below="@+id/write_value_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <Button            android:id="@+id/button_write"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="key写入"/>        <Button            android:id="@+id/button_read_all"            android:layout_alignParentRight="true"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="全部读取"/>    </RelativeLayout>    <!-- name -->    <LinearLayout        android:id="@+id/write_name_layout"        android:layout_below="@+id/write_read_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <TextView            android:id="@+id/insert_text_setOut3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="请输入name的value："            android:textSize="20dp" />        <EditText            android:id="@+id/editText_name"            android:layout_width="fill_parent"            android:layout_height="wrap_content" />    </LinearLayout>    <!-- name写入读取按钮 -->    <RelativeLayout        android:id="@+id/name_write_read_layout"        android:layout_below="@+id/write_name_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <Button            android:id="@+id/button_write_name"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="name写入"/>        <Button            android:id="@+id/button_read_name"            android:layout_alignParentRight="true"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="name读取"/>    </RelativeLayout>    <!-- age -->    <LinearLayout        android:id="@+id/write_age_layout"        android:layout_below="@+id/name_write_read_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <TextView            android:id="@+id/insert_text_setOut4"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="请输入age的value："            android:textSize="20dp" />        <EditText            android:id="@+id/editText_age"            android:layout_width="fill_parent"            android:layout_height="wrap_content" />    </LinearLayout>    <!-- name写入读取按钮 -->    <RelativeLayout        android:id="@+id/age_write_read_layout"        android:layout_below="@+id/write_age_layout"        android:layout_width="fill_parent"        android:layout_height="wrap_content">        <Button            android:id="@+id/button_write_age"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="age写入"/>        <Button            android:id="@+id/button_read_age"            android:layout_alignParentRight="true"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="age读取"/>    </RelativeLayout>    <TextView        android:id="@+id/textView_content"        android:layout_below="@id/age_write_read_layout"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="读取内容显示" /></RelativeLayout>

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