SharedPreferences 操作

public class SPActivity extends Activity {

    /**使用SharedPreferences 来储存与读取数据**/
    SharedPreferences mShared = null;

    /**程序中可以同时存在多个SharedPreferences数据， 根据SharedPreferences的名称就可以拿到对象**/
    public final static String SHARED_MAIN = "main";

    /**SharedPreferences中储存数据的Key名称**/
    public final static String KEY_NAME = "name";
    public final static String KEY_NUMBER = "number";

    /**SharedPreferences中储存数据的路径**/
    public final static String DATA_URL = "/data/data/";
    public final static String SHARED_MAIN_XML = "main.xml";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.sharedpreferences);
    /**拿到名称是SHARED_MAIN 的SharedPreferences对象**/
    mShared = getSharedPreferences(SHARED_MAIN, Context.MODE_PRIVATE);
    /**拿到SharedPreferences中保存的数值 第二个参数为如果SharedPreferences中没有保存就赋一个默认值**/
    String name = mShared.getString(KEY_NAME, "数据库中没有储存姓名");
    String number = mShared.getString(KEY_NUMBER, "数据库中没有储存号码");

    final EditText editName = (EditText)findViewById(R.id.sp_et0);
    final EditText editNumber = (EditText)findViewById(R.id.sp_et1);
    editName.setHint("上次输入的姓名为【 " +name+"】");
    editNumber.setHint("上次输入的号码为【 " +number+"】");

    Button button0 = (Button)findViewById(R.id.sp_button0);

    /**监听按钮点击后保存用户输入信息到SharedPreferences中**/
    button0.setOnClickListener(new  OnClickListener() {

        @Override
        public void onClick(View arg0) {
        /**拿到用户输入的信息**/
        String name = editName.getText().toString();
        String number = editNumber.getText().toString();
        /**开始保存入SharedPreferences**/
        Editor editor = mShared.edit();
        editor.putString(KEY_NAME, name);
        editor.putString(KEY_NUMBER, number);
        /**put完毕必需要commit()否则无法保存**/
        editor.commit();
        ShowDialog("保存SharedPreferences成功");

        }
    });

    Button button1 = (Button)findViewById(R.id.sp_button1);
    button1.setOnClickListener(new  OnClickListener() {

        @Override
        public void onClick(View arg0) {
        /**开始清除SharedPreferences中保存的内容**/
        Editor editor = mShared.edit();
        editor.remove(KEY_NAME);
        editor.remove(KEY_NUMBER);
        //editor.clear();
        editor.commit();
        ShowDialog("清除SharedPreferences数据成功");
        }
    });

    Button button2 = (Button)findViewById(R.id.sp_button2);
    button2.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
        /** 删除SharedPreferences文件 **/
        File file = new File(DATA_URL + getPackageName().toString()
            + "/shared_prefs", SHARED_MAIN_XML);
        if (file.exists()) {
            file.delete();
        }
        ShowDialog("删除SharedPreferences文件成功");
        }
    });


    super.onCreate(savedInstanceState);
    }

    public void ShowDialog(String string) {
    AlertDialog.Builder builder = new AlertDialog.Builder(SPActivity.this);
    builder.setIcon(R.drawable.icon);
    builder.setTitle(string);
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
        finish();
        }
    });
    builder.show();
    }
}

<?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"
    >
    <ImageView android:id="@+id/sp_image"
        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
        android:src="@drawable/image"
        android:layout_gravity="center"
        />
    <EditText android:id="@+id/sp_et0"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:hint="请输入你的姓名">
    </EditText>
    <EditText android:id="@+id/sp_et1"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:hint="请输入你的号码">
    </EditText>
    <Button   android:id="@+id/sp_button0"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="保存输入内容shared">
    </Button>
    <Button   android:id="@+id/sp_button1"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="清除shared保存内容">
    </Button>
    <Button   android:id="@+id/sp_button2"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="删除shared文件">
    </Button>
</LinearLayout>