Android SharedPreferences保存应用参数

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 MainActivity extends Activity {    private EditText nameText;    private EditText ageText;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        nameText = (EditText)findViewById(R.id.name);ageText = (EditText)findViewById(R.id.age);        Button button = (Button)this.findViewById(R.id.button);        button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String name = nameText.getText().toString();String age = ageText.getText().toString();SharedPreferences preferences = getSharedPreferences("itcast", Context.MODE_WORLD_READABLE);Editor editor = preferences.edit();editor.putString("name", name);editor.putInt("age", new Integer(age));editor.commit();Toast.makeText(MainActivity.this, R.string.success, 1).show();}});                Button resumebutton = (Button)this.findViewById(R.id.resume);        resumebutton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {SharedPreferences preferences = getSharedPreferences("itcast", Context.MODE_PRIVATE);String name = preferences.getString("name", "");int age = preferences.getInt("age", 20);nameText.setText(name);ageText.setText(String.valueOf(age));}});    }}