SharedPreferences的使用

在Android中可以使用SharedPreferences进行私有数据的保存。

下面展示一个简单的小例子。

package com.xiaochun91103;import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.widget.EditText;import android.widget.TextView;public class SharedPreferencesTest extends Activity { /** Called when the activity is first created. */private EditText et; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); et = (EditText)findViewById(R.id.et); }@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();SharedPreferences prefs = getPreferences(0);String restoredText = prefs.getString("text", null);if(restoredText != null) {et.setText(restoredText,TextView.BufferType.EDITABLE);int selectStart = prefs.getInt("selectStart", -1);int selectEnd = prefs.getInt("selectEnd", -1);if(selectStart != -1 && selectEnd != -1) {et.setSelection(selectStart, selectEnd);}}}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();SharedPreferences.Editor editor = getPreferences(0).edit();editor.putString("text",et.getText().toString());editor.putInt("selectStart", et.getSelectionStart());editor.putInt("selectEnd", et.getSelectionEnd());editor.commit();}}

 

布局文件如下：

 

<?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="SharedPreferences的使用" /><EditText android:id="@+id/et" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="可被保存的EditText"/> </LinearLayout>

 

以下是运行结果截图：