SharedPreferences的使用

SharePreferenceService类

package com.anlen.experimentfour;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class SharePreferenceService {
	public static void saveInfo(Context context,String name,String password){
			SharedPreferences sp=context.getSharedPreferences("config", Context.MODE_PRIVATE);
			Editor ed=sp.edit();
			ed.putString("username", name);
			ed.putString("password", password);
			ed.commit();	
	}
}

MainActivity类

package com.anlen.experimentfour;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
	
	EditText username;
	EditText password;
	Button login;
	CheckBox check;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		username = (EditText) findViewById(R.id.username);
		password = (EditText) findViewById(R.id.password);
		check = (CheckBox) findViewById(R.id.checkBox1);
		
		SharedPreferences sp=getSharedPreferences("config", Context.MODE_PRIVATE);
		username.setText(sp.getString("username", ""));
		password.setText(sp.getString("password", ""));
	}
	
	public void login(View view){
		String names;
		String passwords;
		names = username.getText().toString().trim();
		passwords = password.getText().toString().trim();
		if(TextUtils.isEmpty(names)||TextUtils.isEmpty(passwords)){
			Toast.makeText(this, "账户或者密码不能为空", Toast.LENGTH_SHORT);
		}
			
		if(check.isChecked()){
			
			SharePreferenceService.saveInfo(this, names, passwords);
			Toast.makeText(this, "保存信息到config.xml中", Toast.LENGTH_SHORT).show();
		}
	}
	
}

布局：

<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity" >

	<RelativeLayout
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content" >

	    <TextView
	        android:id="@+id/namelaber"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:text="@string/username" />

	    <EditText
	        android:inputType="text"
	        android:id="@+id/username"
	        android:layout_width="match_parent"
	        android:layout_height="wrap_content"
	        android:layout_below="@+id/namelaber" />

	    <TextView
	        android:id="@+id/passwordlaber"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:layout_below="@+id/username"
	        android:text="@string/password" />

	    <EditText
	        android:id="@+id/password"
	        android:layout_width="match_parent"
	        android:layout_height="wrap_content"
	        android:layout_below="@+id/passwordlaber"
	        android:inputType="textPassword" />

	    <CheckBox
	        android:id="@+id/checkBox1"
	        android:layout_width="wrap_content"
	        android:layout_height="50dp"
	        android:layout_below="@+id/password"
	        android:checked="true"
	        android:text="@string/remember" />

	    <Button
	        android:onClick="login"
	        android:layout_width="100dp"
	        android:layout_height="50dp"
	        android:layout_below="@+id/password"
	        android:layout_alignParentRight="true"
	        android:text="@string/login" />
	</RelativeLayout>

</LinearLayout>