android使用SharedPreferences保存值，值变化会提示

<?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">    <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content">        <TextView android:layout_width="wrap_content"            android:layout_height="wrap_content"             android:text="姓名"            android:textSize="20px"            android:id="@+id/nameLable" />        <EditText android:layout_width="80px"            android:layout_height="wrap_content"             android:layout_toRightOf="@id/nameLable"            android:layout_alignTop="@id/nameLable"            android:layout_marginLeft="10px"            android:id="@+id/name" />    </RelativeLayout>    <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content">    </RelativeLayout>    <RelativeLayout              android:layout_width="wrap_content"        android:layout_height="wrap_content">        <Button android:layout_width="wrap_content"            android:layout_height="wrap_content"             android:text="保存"            android:id="@+id/button" />        <Button android:layout_width="wrap_content"            android:layout_height="wrap_content"             android:text="显示"            android:layout_toRightOf="@+id/button"            android:layout_alignTop="@id/button"            android:id="@+id/showButton" />    </RelativeLayout>    <TextView android:layout_width="fill_parent"            android:layout_height="wrap_content"             android:textSize="20px"                 android:text="内容"            android:id="@+id/showText" /></LinearLayout>

<pre name="code" class="java">package com.example.sharedpreferences_1;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.content.DialogInterface;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private EditText nameText;private EditText ageText;private TextView resultText;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);nameText = (EditText) findViewById(R.id.name);resultText = (TextView) findViewById(R.id.showText);final SharedPreferences sp = getSharedPreferences("lyzh",MODE_WORLD_READABLE + MODE_WORLD_WRITEABLE);Button button = (Button) findViewById(R.id.button);Button showButton = (Button) findViewById(R.id.showButton);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO 自动生成的方法存根final String newName = nameText.getText().toString();String oldName = sp.getString("name", "");if (!newName.equals(oldName)) {AlertDialog.Builder builder = new Builder(MainActivity.this);builder.setTitle("提示");builder.setMessage("名称发生改变，是否修改?");builder.setPositiveButton("确定",new android.content.DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {// TODO 自动生成的方法存根Editor editor = sp.edit();editor.putString("name", newName);editor.commit();Toast.makeText(MainActivity.this, "保存成功",Toast.LENGTH_SHORT).show();}});builder.setNegativeButton("取消",new android.content.DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {// TODO 自动生成的方法存根}});builder.create().show();}}});showButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO 自动生成的方法存根String nameValue = sp.getString("name", "");resultText.setText("姓名:" + nameValue);}});}// /onCreate}

android使用SharedPreferences保存值，值变化会提示_第1张图片

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