android中使用SharedPreferences进行数据存储的操作方法

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.TextView;
import android.widget.Toast;

public class SpActivity extends Activity {
    private EditText nameText;
    private EditText ageText;
    private TextView resultText;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        nameText = (EditText)this.findViewById(R.id.name);
        ageText = (EditText)this.findViewById(R.id.age);
        resultText = (TextView)this.findViewById(R.id.showText);

        Button button = (Button)this.findViewById(R.id.button);
        Button showButton = (Button)this.findViewById(R.id.showButton);
        button.setOnClickListener(listener);
        showButton.setOnClickListener(listener);

        // 回显
        SharedPreferences sharedPreferences=getSharedPreferences("ljq123",
                Context.MODE_WORLD_READABLE+Context.MODE_WORLD_WRITEABLE);
        String nameValue = sharedPreferences.getString("name", "");
        int ageValue = sharedPreferences.getInt("age", 1);
        nameText.setText(nameValue);
        ageText.setText(String.valueOf(ageValue));
    }

    private View.OnClickListener listener = new View.OnClickListener(){
        public void onClick(View v) {
            Button button = (Button)v;
            //ljq123文件存放在/data/data//shared_prefs目录下
            SharedPreferences sharedPreferences=getSharedPreferences("ljq123",
                    Context.MODE_WORLD_READABLE+Context.MODE_WORLD_WRITEABLE);
            switch (button.getId()) {
            case R.id.button:
                String name = nameText.getText().toString();
                int age = Integer.parseInt(ageText.getText().toString());
                Editor editor = sharedPreferences.edit(); //获取编辑器
                editor.putString("name", name);
                editor.putInt("age", age);
                editor.commit();//提交修改
                Toast.makeText(SpActivity.this, "保存成功", Toast.LENGTH_LONG).show();
                break;
            case R.id.showButton:
                String nameValue = sharedPreferences.getString("name", "");
                int ageValue = sharedPreferences.getInt("age", 1);
                resultText.setText("姓名：" + nameValue + "，年龄：" + ageValue);
                break;
            }
        }
    };
}

import java.io.File;
import java.io.FileInputStream;

import android.content.Context;
import android.content.SharedPreferences;
import android.test.AndroidTestCase;
import android.util.Log;

public class AccessSharePreferenceTest extends AndroidTestCase{
    private static final String TAG = "AccessSharePreferenceTest";

    /**
     * 访问SharePreference的方式一，注：权限要足够
     * @throws Exception
     */
    public void testAccessPreference() throws Exception{
        String path = "/data/data/com.ljq.activity/shared_prefs/ljq123.xml";
        File file = new File(path);
        FileInputStream inputStream = new FileInputStream(file);
        //获取的是一个xml字符串
        String data = new FileService().read(inputStream);
        Log.i(TAG, data);
    }

    /**
     * 访问SharePreference的方式二，注：权限要足够
     * @throws Exception
     */
    public void testAccessPreference2() throws Exception{
        Context cOntext= this.getContext().createPackageContext("com.ljq.activity",
                Context.CONTEXT_IGNORE_SECURITY);
        SharedPreferences sharedPreferences = context.getSharedPreferences("ljq123",
                Context.MODE_WORLD_READABLE+Context.MODE_WORLD_WRITEABLE);
        String name = sharedPreferences.getString("name", "");
        int age = sharedPreferences.getInt("age", 1);
        Log.i(TAG, name + " : " +age);
    }
}