在Recyclerview中取消倒计时

问题描述 投票：0回答：5

我有一个带有倒数计时器的 Recyclerview，它以天、小时、分钟和秒的形式显示剩余的游戏时间。现在我遇到了问题，当我离开活动时，倒计时计时器仍在运行。 这是我的适配器：

Public class RvAdapterShowVsTeamChallenges extends RecyclerView.Adapter<RvAdapterShowVsTeamChallenges.ViewHolderClass> {

private Boolean boFirstTime = true;

private int [] ayColors = {R.drawable.circle_red,R.drawable.circle_purple,R.drawable.circle_orange,R.drawable.circle_blue,R.drawable.circle_tile};

private Context context;

private CountDownTimer countDownTimerTest;

private DatabaseWrite databaseWrite;

private SharedPrefs sharedPrefs;




public RvAdapterShowVsTeamChallenges(final Context context)
{
    this.context = context;
}


public class ViewHolderClass extends RecyclerView.ViewHolder{

    private TextView txtChallenger;
    private TextView txtOponnent;
    private TextView txtChallengerScore;
    private TextView txtOponnentScore;
    private TextView txtTime;

    private TextView txtChallengerLetters;
    private TextView txtOponnentLetters;

    private ProgressBar prgChallenger;
    private ProgressBar prgOponnent;



    public ViewHolderClass(View itemView) {
        super(itemView);

        sharedPrefs = new SharedPrefs(context);


        txtChallenger = (TextView) itemView.findViewById(R.id.txtChallenger);
        txtOponnent = (TextView) itemView.findViewById(R.id.txtOponnent);

        txtChallengerScore = (TextView) itemView.findViewById(R.id.txtChallengerScore);
        txtOponnentScore = (TextView) itemView.findViewById(R.id.txtOponnentScore);

        txtChallengerLetters = (TextView)itemView.findViewById(R.id.txtChallengerLetter);
        txtOponnentLetters = (TextView)itemView.findViewById(R.id.imgOponnent);

        txtTime = (TextView) itemView.findViewById(R.id.txtTime);


        prgChallenger = (ProgressBar) itemView.findViewById(R.id.prgTimeLeft);
        prgOponnent = (ProgressBar) itemView.findViewById(R.id.prgOponnent);




    }
}



@Override
public ViewHolderClass onCreateViewHolder(final ViewGroup parent, final int viewType) {

    View itemview1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_show_vs_team_challenges,null);


    if(boFirstTime)
    {
        for(int i=0; i<ShowVsTeam.ayListTimeLeftChallenge.size(); i++)
        {
            long substractFalseValue =  ((ShowVsTeam.ayListTimeLeftChallenge.get(i)-1209600033)/1000);

            long total = ((substractFalseValue + 1209600)*1000);

            long difference = (total - System.currentTimeMillis());
            ShowVsTeam.ayListTimeLeftChallenge.set(i, difference);
        }

        boFirstTime = false;
    }


    countDownTimerTest = new CountDownTimer(1800000,1000) {
        @Override
        public void onTick(long millisUntilFinished) {

            for(int i=0; i<ShowVsTeam.ayListTimeLeftChallenge.size(); i++)
            {
                long lngUntilNow = ShowVsTeam.ayListTimeLeftChallenge.get(i);

                long lngNow = (lngUntilNow-(1000/ShowVsTeam.ayListTimeLeftChallenge.size()));

                ShowVsTeam.ayListTimeLeftChallenge.set(i, Long.valueOf(lngNow));
            }

            notifyDataSetChanged();
        }

        @Override
        public void onFinish() {

        }
    }.start();



    return new ViewHolderClass(itemview1);
}

@Override
public void onBindViewHolder(final ViewHolderClass holder, final int position) {


    holder.txtChallenger.setText(sharedPrefs.getTeamnameServer(context));
    holder.txtOponnent.setText(ShowVsTeam.aylistOponnentTeamsChallenge.get(position));

    holder.txtChallengerScore.setText(ShowVsTeam.ayListScoreChallengerChallenge.get(position));
    holder.txtOponnentScore.setText(ShowVsTeam.ayListScoreOppnnentChallenge.get(position));

    String strLetterChallenger = sharedPrefs.getTeamnameServer(context).substring(0,1);
    String strLetterOpponnent = ShowVsTeam.aylistOponnentTeamsChallenge.get(position).substring(0,1);


    holder.txtChallengerLetters.setText(strLetterChallenger);
    holder.txtOponnentLetters.setText(strLetterOpponnent);
    holder.txtOponnentLetters.setBackgroundResource(ayColors[position]);

    holder.prgChallenger.setProgress(Integer.parseInt(ShowVsTeam.ayListScoreChallengerChallenge.get(position)));
    holder.prgOponnent.setProgress(Integer.parseInt(ShowVsTeam.ayListScoreOppnnentChallenge.get(position)));


    long seconds = TimeUnit.MILLISECONDS.toSeconds(ShowVsTeam.ayListTimeLeftChallenge.get(position));
    int intDay = (int)TimeUnit.SECONDS.toDays(seconds);
    long lngHours = TimeUnit.SECONDS.toHours(seconds) - (intDay *24);
    long lngMinutes = TimeUnit.SECONDS.toMinutes(seconds) - (TimeUnit.SECONDS.toHours(seconds)* 60);
    long lngSeconds = TimeUnit.SECONDS.toSeconds(seconds) - (TimeUnit.SECONDS.toMinutes(seconds) *60);

    holder.txtTime.setText(String.valueOf(intDay)+"d:"+String.valueOf(lngHours)+"h:"+String.valueOf(lngMinutes)+"m:"+String.valueOf(lngSeconds)+"s");

}


@Override
public int getItemCount() {
    return ShowVsTeam.aylistOponnentTeamsChallenge.size();
    }


}

我尝试取消 Activity 中的 CountDownTimer onStop()，但我得到一个空指针，尽管倒数计时器仍在运行。

在适配器中

public void finishTimer(){
    if(countDownTimerTest!=null){
        countDownTimerTest.cancel();
    }
}

活动中

    @Override
protected void onStop() {

    if(rvAdapterShowVsTeamChallenges!=null){
        rvAdapterShowVsTeamChallenges.finishTimer();
    }

    super.onStop();
    }
}

你能帮我吗？

更新

适配器

public class RvAdapterShowVsTeamChallenges extends RecyclerView.Adapter<RvAdapterShowVsTeamChallenges.ViewHolderClass> {

private Boolean boFirstTime = true;

private int [] ayColors = {R.drawable.circle_red,R.drawable.circle_purple,R.drawable.circle_orange,R.drawable.circle_blue,R.drawable.circle_tile};

private Context context;


private DatabaseWrite databaseWrite;

private SharedPrefs sharedPrefs;

private CountDownTimerTest countDownTimerTest;


public RvAdapterShowVsTeamChallenges(final Context context)
{
    this.context = context;
}


public class ViewHolderClass extends RecyclerView.ViewHolder{

    private TextView txtChallenger;
    private TextView txtOponnent;
    private TextView txtChallengerScore;
    private TextView txtOponnentScore;
    private TextView txtTime;

    private TextView txtChallengerLetters;
    private TextView txtOponnentLetters;

    private ProgressBar prgChallenger;
    private ProgressBar prgOponnent;



    public ViewHolderClass(View itemView) {
        super(itemView);

        sharedPrefs = new SharedPrefs(context);


        txtChallenger = (TextView) itemView.findViewById(R.id.txtChallenger);
        txtOponnent = (TextView) itemView.findViewById(R.id.txtOponnent);

        txtChallengerScore = (TextView) itemView.findViewById(R.id.txtChallengerScore);
        txtOponnentScore = (TextView) itemView.findViewById(R.id.txtOponnentScore);

        txtChallengerLetters = (TextView)itemView.findViewById(R.id.txtChallengerLetter);
        txtOponnentLetters = (TextView)itemView.findViewById(R.id.imgOponnent);

        txtTime = (TextView) itemView.findViewById(R.id.txtTime);


        prgChallenger = (ProgressBar) itemView.findViewById(R.id.prgTimeLeft);
        prgOponnent = (ProgressBar) itemView.findViewById(R.id.prgOponnent);

    }
}



@Override
public ViewHolderClass onCreateViewHolder(final ViewGroup parent, final int viewType) {

    View itemview1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_show_vs_team_challenges,null);


    if(boFirstTime)
    {
        for(int i=0; i<ShowVsTeam.ayListTimeLeftChallenge.size(); i++)
        {
            long substractFalseValue =  ((ShowVsTeam.ayListTimeLeftChallenge.get(i)-1209600033)/1000);

            long total = ((substractFalseValue + 1209600)*1000);

            long difference = (total - System.currentTimeMillis());
            ShowVsTeam.ayListTimeLeftChallenge.set(i, difference);
        }

        boFirstTime = false;
    }


    return new ViewHolderClass(itemview1);
}

@Override
public void onBindViewHolder(final ViewHolderClass holder, final int position) {


    holder.txtChallenger.setText(sharedPrefs.getTeamnameServer(context));
    holder.txtOponnent.setText(ShowVsTeam.aylistOponnentTeamsChallenge.get(position));

    holder.txtChallengerScore.setText(ShowVsTeam.ayListScoreChallengerChallenge.get(position));
    holder.txtOponnentScore.setText(ShowVsTeam.ayListScoreOppnnentChallenge.get(position));

    String strLetterChallenger = sharedPrefs.getTeamnameServer(context).substring(0,1);
    String strLetterOpponnent = ShowVsTeam.aylistOponnentTeamsChallenge.get(position).substring(0,1);


    holder.txtChallengerLetters.setText(strLetterChallenger);
    holder.txtOponnentLetters.setText(strLetterOpponnent);
    holder.txtOponnentLetters.setBackgroundResource(ayColors[position]);

    holder.prgChallenger.setProgress(Integer.parseInt(ShowVsTeam.ayListScoreChallengerChallenge.get(position)));
    holder.prgOponnent.setProgress(Integer.parseInt(ShowVsTeam.ayListScoreOppnnentChallenge.get(position)));


    long seconds = TimeUnit.MILLISECONDS.toSeconds(ShowVsTeam.ayListTimeLeftChallenge.get(position));
    int intDay = (int)TimeUnit.SECONDS.toDays(seconds);
    long lngHours = TimeUnit.SECONDS.toHours(seconds) - (intDay *24);
    long lngMinutes = TimeUnit.SECONDS.toMinutes(seconds) - (TimeUnit.SECONDS.toHours(seconds)* 60);
    long lngSeconds = TimeUnit.SECONDS.toSeconds(seconds) - (TimeUnit.SECONDS.toMinutes(seconds) *60);

    holder.txtTime.setText(String.valueOf(intDay)+"d:"+String.valueOf(lngHours)+"h:"+String.valueOf(lngMinutes)+"m:"+String.valueOf(lngSeconds)+"s");

}


@Override
public int getItemCount() {
    return ShowVsTeam.aylistOponnentTeamsChallenge.size();
}


private class CountDownTimerTest extends CountDownTimer {

    private CountDownTimerTest(long millis, long interval) {
        super(millis, interval);
    }

    @Override
    public void onTick(long millisUntilFinished) {

        for(int i=0; i<ShowVsTeam.ayListTimeLeftChallenge.size(); i++)
        {
            long lngUntilNow = ShowVsTeam.ayListTimeLeftChallenge.get(i);

            long lngNow = (lngUntilNow-(1000/ShowVsTeam.ayListTimeLeftChallenge.size()));

            ShowVsTeam.ayListTimeLeftChallenge.set(i, Long.valueOf(lngNow));
        }

        notifyDataSetChanged();

    }

    @Override
    public void onFinish() {


    }
}


public void startTimer(){

    if(countDownTimerTest==null){
        countDownTimerTest= new CountDownTimerTest(1800000,1000);
    }

    countDownTimerTest.start();
}


public void cancelTimer(){

    countDownTimerTest.cancel();
    }

}

活动

public class ShowVsTeam extends AppCompatActivity {

public int intTextBo = 0;

private String  strMethod;

static ArrayList<String> ayListChallengerTeamsRequest;
static ArrayList<String> ayListChallengerPlayedRequest;
static ArrayList<String> ayListChallengerNumberOfMembersRequest;
static ArrayList<String> ayListChallengerAcceptedRequest;
static ArrayList<String> ayListOponnentTeamsRequest;
static ArrayList<String> ayListOponnnetPlayedRequest;
static ArrayList<String> ayListOponnentNumberOfMembersRequest;

static ArrayList<String> ayListOnlyChallengerTeamsRequest;
static ArrayList<String> ayListOnlyAcceptedRequest;
static ArrayList<String> ayListOnlyRequiredRequest;


static ArrayList<String> aylistOponnentTeamsChallenge;
static ArrayList<String> ayListScoreChallengerChallenge;
static ArrayList<String> ayListScoreOppnnentChallenge;

static ArrayList<Long> ayListTimeLeftRequestChallenger;
static ArrayList<Long> ayListTimeLeftRequestOponnent;
static ArrayList<Long> ayListTimeLeftChallenge;


private TextView txtToolbarTitle;
static TextView txtNo;

private Toolbar toolbar;


private RecyclerView recyclerViewRequests;
private RecyclerView.Adapter rvAdapterRequests;
private RecyclerView.LayoutManager rvLayoutManagerRequests;

private RecyclerView recyclerViewChallenges;
private RecyclerView.Adapter rvAdapterChallenges;
private RecyclerView.LayoutManager rvLayoutManagerChallenges;

private RvAdapterShowVsTeamChallenges rvAdapterShowVsTeamChallenges;


private SharedPrefs sharedPrefs;
private DatabaseWrite databaseWrite;



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

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.show_vs_team);

    initialize();
    declare();
    navigation();
    getVS();
}

private void initialize() {

    txtNo = (TextView)findViewById(R.id.txtNo);

    toolbar = (Toolbar)findViewById(R.id.toolbar);
    txtToolbarTitle = (TextView)toolbar.findViewById(R.id.txtToolbarTitle);


    recyclerViewRequests = (RecyclerView)findViewById(R.id.recyclerShowVsTeamRequests);
    rvLayoutManagerRequests = new LinearLayoutManager(this);
    rvAdapterRequests = new RvAdapterShowVsTeamRequests(this);


    recyclerViewChallenges = (RecyclerView)findViewById(R.id.recyclerShowVsTeamChallenges);
    rvLayoutManagerChallenges  = new LinearLayoutManager(this);
    rvAdapterChallenges  = new RvAdapterShowVsTeamChallenges(this);

    rvAdapterShowVsTeamChallenges = new RvAdapterShowVsTeamChallenges(this);

    sharedPrefs = new SharedPrefs(this);


}

 private void declare() {

     recyclerViewRequests.setLayoutManager(rvLayoutManagerRequests);
     recyclerViewChallenges.setLayoutManager(rvLayoutManagerChallenges);

}


private void navigation() {

    txtToolbarTitle.setText("BeforeTeam");

    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayShowTitleEnabled(false);
}


private void getVS()
{
    strMethod = "showVsTeamRequests";

    databaseWrite = new DatabaseWrite(this);
    databaseWrite.passTheClassShowVsTeam(this);
    databaseWrite.execute(strMethod,sharedPrefs.getTeamnameServer(this));


    strMethod = "showVsTeamChallenges";

    databaseWrite = new DatabaseWrite(this);
    databaseWrite.passTheClassShowVsTeam(this);
    databaseWrite.execute(strMethod,sharedPrefs.getTeamnameServer(this));
}


public void showVsTeamRequests()
{
    recyclerViewRequests.setAdapter(rvAdapterRequests);


}

public void showVsteamChallenges()
{
    recyclerViewChallenges.setAdapter(rvAdapterChallenges);
    rvAdapterShowVsTeamChallenges.startTimer();
}


@Override
public void onBackPressed() {
    super.onBackPressed();

    rvAdapterShowVsTeamChallenges.cancelTimer();
}

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

    rvAdapterShowVsTeamChallenges.cancelTimer();
}

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

    rvAdapterShowVsTeamChallenges.cancelTimer();
    }
}
java android android-recyclerview countdowntimer
5个回答
5
投票

我实际上使用的是 onViewDetachedFromWindow 和 onViewAttachedFromWindow 函数。然而，当活动销毁时，我看到 onViewRecycled 函数工作了一次。这些代码非常适合我：

将 onViewRecycled 添加到您的 RecycleViewAdapter 

@Override
public void onViewRecycled(@NonNull ViewHolder holder) {
    super.onViewRecycled(holder);
    //add cancel function
    if (holder.timer != null) {
        holder.timer.cancel();
    }
}

之后，将 onDestroy 添加到您的 Activity

@Override
protected void onDestroy() {
    super.onDestroy();
    //set adapter
    recylerView.setAdapter(null);
}
0
投票

在您的 RvAdapterShowVsTeamChallenges 类中，您有一个名为“countDownTimerTest”的成员，但它只能保存对 CountDownTimer 的一个对象的引用。 我认为您遇到的问题是您尝试在 RecyclerView 中显示多个项目，并且每次调用 onCreateViewHolder() 时都会覆盖“countDownTimerTest”的引用。

我认为防止这种情况的最佳解决方案是使用 

Map<Integer, CountDownTimer> timerMap = new HashMap<Integer, CountDownTimer>();
来存储所有 CountDownTimers。然后在 onBindViewHolder() 中检查地图是否包含该位置的项目，如果不包含 - 然后创建新的倒计时器

CountDownTimer timer = timerMap.get(position); 
if(timer == null){
timer = new CountDownTimer(1800000,1000) {
    @Override
    public void onTick(long millisUntilFinished) {

        for(int i=0; i<ShowVsTeam.ayListTimeLeftChallenge.size(); i++){
            long lngUntilNow = ShowVsTeam.ayListTimeLeftChallenge.get(i);

            long lngNow = (lngUntilNow-(1000/ShowVsTeam.ayListTimeLeftChallenge.size()));

            ShowVsTeam.ayListTimeLeftChallenge.set(i, Long.valueOf(lngNow));
        }

        notifyDataSetChanged();
    }

    @Override
    public void onFinish() {

    }
}
    timer.start();
    timerMap.put(position, timer);
}

完成 Activity 后，只需调用一个方法即可执行此操作：

for(CountDownTimer timer : timerMap.values()){
        timer.cancel();
}
0
投票

在适配器中创建一个公共方法，例如：

public void finishTimer(){    
   if(countDownTimerTest!=null){    
    countDownTimerTest.cancel();      
    countDownTimer = null;
   }
}

如果您完成了活动，则从您的活动中调用它：

    @Override
protected void onStop() {

 if(mYourRecyclerViewAdapter!=null){
      mYourRecyclerViewAdapter.finishTimer();

   }

super.onStop();
}

编辑

您应该将其作为一个类，而不是在视图持有者中创建 CountDownTimer：

 private class CountDownTimerTest extends CountDownTimer {

        private CountDownTimerTest(long millis, long interval) {
            super(millis, interval);
        }

        @Override
        public void onTick(long millisUntilFinished) {

            for(int i=0; i<ShowVsTeam.ayListTimeLeftChallenge.size(); i++)
            {
                long lngUntilNow = ShowVsTeam.ayListTimeLeftChallenge.get(i);

                long lngNow = (lngUntilNow-(1000/ShowVsTeam.ayListTimeLeftChallenge.size()));

                ShowVsTeam.ayListTimeLeftChallenge.set(i, Long.valueOf(lngNow));
            }

            notifyDataSetChanged();

        }

        @Override
        public void onFinish() {


        }
    }

然后你可以在你的适配器中创建一个全局对象：

private CountDownTimerTest countDownTimerTest;

以及适配器中的公共启动方法（如果您需要在外部启动它）：

public void startTimer(){

if(countDownTimerTest==null){
  countDownTimerTest= new CountDownTimerTest(1800000,1000);
  }

  countDownTimerTest.start();
}

如果您仍想在视窗中启动它，只需在内部调用 

startTimer()
即可。如果您想在活动中启动它，请致电 
mYourAdapter.startTimer();
。然后你可以按照上面的建议停止它。

从您的评论中我了解到，每次您开始活动时，都会创建一个新的计时器。如果你这样做，通常问题就会消失。否则，您可以通过将清单中的 

android:launchMode="singleTop"
设置到活动标记中来避免创建活动的新实例。通过这样做，您的活动只有在之前被销毁时才会被创建。

0
投票

在 

CountDownTimer
中设置 
SparseArray
并取消 Activity 
onDestroy
方法中的所有计时器， 请检查此链接，它对我的项目有帮助

在Recyclerview中取消倒计时

0
投票

正如 @Atakan Yildirim 指出的那样，当你为你的 

onViewRecycled()
制作 
adapter = null
时，肯定会调用 
recyclerview
所以你的代码将是这样的

override fun onStop() {
    super.onStop()
    currentItemPosition =
        (binding.recyclerView.layoutManager as? LinearLayoutManager)
            ?.findFirstVisibleItemPosition() ?: 0

    binding.recyclerView.adapter = null
}

override fun onStart() {
    super.onStart()
    binding.recyclerView.adapter = myCustomAdapter
    binding.recyclerView.scrollToPosition(currentItemPosition)
}

然后确保正确实施

onViewRecycled()
以释放资源。

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