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Android SharedPreferences(信息的保存和讀取)

日期：2017/3/1 10:51:22 编辑：Linux編程

//main.xml，主布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/name" />
<EditText
android:id="@+id/webname"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/age"
>
</TextView>
<EditText
android:id="@+id/age"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:id="@+id/saveButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/save"
/>
<Button
android:id="@+id/restorationData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/huifu"
/>
</LinearLayout>
</LinearLayout>

//strings.xml常量字符串

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello SharedPreferencesActivity!</string>
<string name="app_name">軟件參數保存</string>
<string name="name">網名</string>
<string name="age">年齡</string>
<string name="save">保存參數</string>
<string name="success">保存成功</string>
<string name="huifu">恢復參數</string>
</resources>

//SharedPreferencesActivity.java 處理類

package sn.len.sharedpreferences;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class SharedPreferencesActivity extends Activity
{
private EditText name=null;
private EditText age=null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
name=(EditText)findViewById(R.id.webname);
age=(EditText)findViewById(R.id.age);
Button saveButton=(Button)findViewById(R.id.saveButton);
Button restorationButton=(Button)findViewById(R.id.restorationData);
//寫入信息
saveButton.setOnClickListener
(
new View.OnClickListener()
{
@Override
public void onClick(View v)
{
String web_name=name.getText().toString();
String true_age=age.getText().toString();
SharedPreferences preferences=getSharedPreferences("softinfo",Context.MODE_WORLD_READABLE);
Editor edit=preferences.edit();
edit.putString("name", web_name);
edit.putInt("age",new Integer(true_age));
edit.commit();
Toast.makeText(SharedPreferencesActivity.this, R.string.success,Toast.LENGTH_LONG).show();
}
}
);
//讀取信息
restorationButton.setOnClickListener
(
new View.OnClickListener()
{
@Override
public void onClick(View v)
{
SharedPreferences ferences=getSharedPreferences("softinfo",0);
String true_name=ferences.getString("name", "");
int true_age=ferences.getInt("age", 20);
name.setText(true_name);
age.setText(String.valueOf(true_age));
}
}
);
}
}

//運行結果

點擊保存按鈕，成功後消除內容，再點恢復數據，也就是重新讀取XML的值放在EditText中

//重其它App中，訪問這個APP的信息，如下代碼

package sn.len.others;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageManager.NameNotFoundException;
import android.test.AndroidTestCase;
import android.util.Log;
public class SharPreferencesSoftinfoTest extends AndroidTestCase
{
private static final String TAG="SharePreferencesContent";
public void testAccessSharedPreferences() throws NameNotFoundException
{
//通過本應該程序的上下文來建想要訪問App的上下文對象
//sn.len.sharedpreferences 存放softinfo.xml那個包名稱
//CONTEXT_IGNORE_SECURITY 取消跨App的的訪問安全
Context accessSharePreferences=getContext().createPackageContext("sn.len.sharedpreferences",Context.CONTEXT_IGNORE_SECURITY);
SharedPreferences shared=accessSharePreferences.getSharedPreferences("softinfo", Context.MODE_PRIVATE);
String name=shared.getString("name", "");
int age=shared.getInt("age", 18);
Log.i(TAG, "name:"+name+"age:"+age);
}
}