Android SharedPreferences(信息的保存和读取)

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);           //写入信息            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();                                                  }                   }           );           //读取信息            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));                       }                   }           );       }   }