Android判断程序是否第一次运行

SharedPreferences sharedPreferences = this.getSharedPreferences("share", MODE_PRIVATE);

boolean isFirstRun = sharedPreferences.getBoolean("isFirstRun", true);
Editor editor = sharedPreferences.edit();

if (isFirstRun)
{
Log.d("debug", "第一次运行");
editor.putBoolean("isFirstRun", false);
editor.commit();
} else
{
Log.d("debug", "不是第一次运行");
}