SharedPreferences的使用

1.注意.putIn和.getIn是對稱關係，使用了putIn,只能使用getIn
2. public static final String PRENAME="sharedpreferences";  指定儲存的檔案名稱為sharedpreferences.xml，檔案在data/data/下
3. editor.commit();記得使用commit進行提交
 
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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">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
      <activity android:name=".sharedpreferences"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".second"
         android:label="second">
         <intent-filter>
         <action android:name="android.intent.action.MAIN"/>
         </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();
    }
}

作者“技術人生”