Android-内部存储读/写问题

我正在开发一款Android游戏。我有一个扩展视图的游戏类和一个主活动类

我正在尝试从内部存储器加载高分。我希望它加载到onCreate（）中并保存在onDestroy（）中

我正在DroidX上测试应用程序。它在尝试读取文件时在启动时崩溃。如果我注释掉该部分来阅读它，应用程序将正常运行，并按其应该的方式写入数据。如果在保存数据时再次运行，则会正确加载数据

在尝试加载文件之前，如何检查文件是否存在

感谢advace

切换到使用，它是为这个用例设计的

下面是一个示例，说明它是多么简单：

public class Example extends Activity {
    public static final String PREFS_NAME = "MyPrefsFile";

    @Override
    protected void onCreate(Bundle state){
       super.onCreate(state);
       . . .

       // Restore preferences
       SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
       // Get highScore if it exists, otherwise default to zero
       int highScore = settings.getInt("highScore", 0);
       setHighScore(highScore);
    }

    @Override
    protected void onStop(){
       super.onStop();

      // We need an Editor object to make preference changes.
      // All objects are from android.context.Context
      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
      SharedPreferences.Editor editor = settings.edit();
      editor.putInt("highScore", mHighScore);

      // Commit the edits!
      editor.commit();
    }
}

public class Example extends Activity {
    public static final String PREFS_NAME = "MyPrefsFile";

    @Override
    protected void onCreate(Bundle state){
       super.onCreate(state);
       . . .

       // Restore preferences
       SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
       // Get highScore if it exists, otherwise default to zero
       int highScore = settings.getInt("highScore", 0);
       setHighScore(highScore);
    }

    @Override
    protected void onStop(){
       super.onStop();

      // We need an Editor object to make preference changes.
      // All objects are from android.context.Context
      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
      SharedPreferences.Editor editor = settings.edit();
      editor.putInt("highScore", mHighScore);

      // Commit the edits!
      editor.commit();
    }
}