如何在 Java 中反转数组

Question

我有一个应用程序的源代码，它显示在后端服务器中上传的值列表，但问题是它以相反的顺序显示值（首先列出上传的旧内容）我希望它正好相反（按日期） .  public class SelectQuizActivity extends AppCompatActivity {private static final String TAG = SelectQuizActivity.class.getSimpleName();private int categoryId;private String catName;private String catImage;private ImageView categoryImage;private TextView categoryName;private RecyclerView quizRecyclerView;@Overrideprotected void onCreate(Bundle savedInstanceState) {    requestWindowFeature(Window.FEATURE_NO_TITLE);    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_select_quiz);    categoryId = getIntent().getExtras().getInt(Constants.CATEGORY);    catName = getIntent().getExtras().getString(Constants.CATEGORY_NAME);    catImage = getIntent().getExtras().getString(Constants.CATEGORY_IMAGE);    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);    if(getSupportActionBar() != null){        getSupportActionBar().setElevation(0);    }    setTitle("");    categoryImage = (ImageView)findViewById(R.id.quiz_category_image);    categoryName = (TextView)findViewById(R.id.quiz_category_name);    quizRecyclerView = (RecyclerView)findViewById(R.id.quiz_category);    quizRecyclerView.setLayoutManager(new GridLayoutManager(SelectQuizActivity.this, 3));    quizRecyclerView.setHasFixedSize(true);    if(Helper.isNetworkAvailable(this)){        allSubcategoryInCategory(catName);    }else{        DisplayMessage.displayErrorMessage(this, "No network available");    }}上面的代码从类别适配器获取输入并将其显示为回收站视图

Answer 1

首先调用这个

Collections.reverse(arrayToListObject(response));

然后

CategoryAdapter mAdapter = new CategoryAdapter(SelectQuizActivity.this, arrayToListObject(response));
                    quizRecyclerView.setAdapter(mAdapter);

Answer 2

java.util.Collections.reverse(arrayToListObject(response))