星期五

<?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" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword" />


    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Save" />


    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Clear" />

</LinearLayout>

package com.platform;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class SharedPreferenceActivity extends Activity {
    /** Called when the activity is first created. */
 private String SETTING = "datas";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //get SharedPreferences object
        SharedPreferences setting = getSharedPreferences(SETTING, 0);
        //get username and password's value (default value "") 
        String username = setting.getString("USERNAME", "");
        String password = setting.getString("PASSWORD", "");
        //get editText1 and editText2 object
        final EditText editText1 = (EditText)findViewById(R.id.editText1);
        final EditText editText2 = (EditText)findViewById(R.id.editText2);
        editText1.setText(username);
        editText2.setText(password);
        
        //get button1
        Button button1 =(Button)findViewById(R.id.button1);
        button1.setText("Save");
        //save datas
        button1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    SharedPreferences setting = getSharedPreferences(SETTING, 0);
    setting.edit().putString("USERNAME", editText1.getText().toString())
    .putString("PASSWORD", editText2.getText().toString()).commit();
   }
  });
        
      //get button2
        Button button2 =(Button)findViewById(R.id.button2);
        button2.setText("Clear");
        //clear datas (commit after clear )
        button2.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    SharedPreferences setting = getSharedPreferences(SETTING, 0);
    setting.edit().clear().commit();
   }
  });
    }
}

Save 后 在adb shell 中查看/data/data/com.platform/shared_prefs/datas.xml