SharedPreferences的使用

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1.注意.putIn和.getIn是对称关系，使用了putIn,只能使用getIn

2. public static final String PRENAME="sharedpreferences"; 指定存储的文件名为sharedpreferences.xml，文件在data/data/下

3. editor.commit();记得使用commit进行提交

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AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="demo.sharedpreferences"

android:versionCode="1"

android:versionName="1.0">

<activity android:name=".sharedpreferences"

android:label="@string/app_name">

<intent-filter>

</intent-filter>

</activity>

<activity android:name=".second"

android:label="second">

<intent-filter>

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="5" />

</manifest>

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main.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello" />

<Button android:text="push me"

android:id="@+id/Button01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

</LinearLayout>

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second.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<Button android:text="push me 2"

android:id="@+id/Button02"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

</LinearLayout>

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sharedpreferences.java:

package demo.sharedpreferences;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class sharedpreferences extends Activity {

public static final String PRENAME="sharedpreferences";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

SharedPreferences settings = getSharedPreferences(PRENAME, 0);

SharedPreferences.Editor editor = settings.edit();

editor.putInt("demo", 99);

editor.commit();

Button btn = (Button) findViewById(R.id.Button01);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int value;

SharedPreferences settings = getSharedPreferences(PRENAME, 0);

value = settings.getInt("demo", 0);

Intent i = new Intent();

i.setClass(sharedpreferences.this, second.class);

startActivity(i);

}

});

}

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second.java:

package demo.sharedpreferences;

import android.app.Activity;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class second extends Activity{

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.second);

Button btn = (Button) findViewById(R.id.Button02);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int value;

SharedPreferences settings = getSharedPreferences("sharedpreferences", 0);

value = settings.getInt("demo", 0);

DisplayToast(value+"");

}

});

}

public void DisplayToast(String str)

{

Toast.makeText(this,str,Toast.LENGTH_SHORT).show();

}

引用自：http://blog.csdn.net/gz_boy/archive/2010/01/12/5182680.aspx

最后程序会打印出从第一个activity里面传入的99