Android判断应用是否第一次运行

SharedPreferences sharedPreferences = this.getSharedPreferences("share", MODE_PRIVATE);          boolean isFirstRun = sharedPreferences.getBoolean("isFirst", true);  Editor editor = sharedPreferences.edit();    if (isFirst)  {      Log.d("debug", "第一次运行");      editor.putBoolean("isFirst", false);      editor.commit();  } else  {      Log.d("debug", "不是第一次运行");  }