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android - ListView 中的多个秒表计时器

转载 作者：行者123 更新时间：2023-11-29 01:15:07 25 4
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我的 Android 应用程序中有一个 ListView，它应该包含秒表计时器以及每一行中的开始和暂停按钮。问题是，当我在一行中启动计时器时，如果我在 ListView 中启动属于另一行的另一个计时器，则第二个计时器也会从第一个计时器所在的时间开始。所以基本上他们不是独立的。我如何修改我的代码，以便每一行都有一个独立的计时器，并且它的时间只有在按下它的(开始或停止)按钮时才会生效。

这是我的自定义适配器类

public class CustomAdapterStopWatch extends BaseAdapter {

private final LayoutInflater layoutInflater;
Context context;
public static List<String> timerList;
private long startTime = 0L;
private Handler customHandler;
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;

public CustomAdapterStopWatch(Context context, List<String> timerList) {

    this.context = context;
    this.timerList = timerList;
    layoutInflater = LayoutInflater.from(context);
    customHandler = new Handler();
}

@Override
public int getCount() {
    return timerList.size();
}

@Override
public Object getItem(int position) {
    return timerList.get(position);
}


@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    final ViewHolder holder;

    if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.stop_watch_list_view, null);
        holder = new CustomAdapterStopWatch.ViewHolder();
        holder.timerTextView = (TextView) convertView.findViewById(R.id.timerInListView);
        holder.startTimer = (Button) convertView.findViewById(R.id.startTimerInListView);
        holder.pauseTimer = (Button) convertView.findViewById(R.id.stopTimerInListView);
        holder.timerTextView.setTag(position);
        holder.startTimer.setTag(position);
        holder.pauseTimer.setTag(position);
        convertView.setTag(holder);

        // Alarm alarm = (Alarm) getItem(position);
    } else {

        holder = (CustomAdapterStopWatch.ViewHolder) convertView.getTag();
    }
    holder.timerTextView.setText(timerList.get(position));

    holder.startTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            startTime = SystemClock.uptimeMillis();
            customHandler.postDelayed( new Runnable() {
                public void run() {
                    timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
                    updatedTime = timeSwapBuff + timeInMilliseconds;
                    int secs = (int) (updatedTime / 1000);
                    int mins = secs / 60;
                    secs = secs % 60;
                    int milliseconds = (int) (updatedTime % 1000);
                    holder.timerTextView.setText("" + mins + ":"
                            + String.format("%02d", secs) + ":"
                            + String.format("%03d", milliseconds));
                    customHandler.postDelayed(this, 0);
                }
            }, 0);

        }
    });


    holder.pauseTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            timeSwapBuff += timeInMilliseconds;
            customHandler.removeCallbacks(new Runnable() {
                public void run() {
                    timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
                    updatedTime = timeSwapBuff + timeInMilliseconds;
                    int secs = (int) (updatedTime / 1000);
                    int mins = secs / 60;
                    secs = secs % 60;
                    int milliseconds = (int) (updatedTime % 1000);
                    holder.timerTextView.setText("" + mins + ":"
                            + String.format("%02d", secs) + ":"
                            + String.format("%03d", milliseconds));
                    customHandler.postDelayed(this, 0);
                }
            });
        }
    });

    return convertView;
}

我使用的布局文件如下:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">


    <TextView
        android:id="@+id/timerInListView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="00:00:00"
        android:textSize="25dp"
        android:textColor="@color/colorGray"/>

    <Button
        android:id="@+id/stopTimerInListView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_marginRight="20dp"
        android:text="Pause"
        android:background="@color/colorGreen"/>

  <Button
    android:id="@+id/startTimerInListView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="22dp"
    android:text="Start"
    android:background="@color/colorGreen"
    android:layout_alignParentTop="true"
    android:layout_toLeftOf="@+id/stopTimerInListView"
    android:layout_toStartOf="@+id/stopTimerInListView"
    android:layout_marginEnd="22dp" />

 </RelativeLayout>

我使用适配器的秒表类如下:

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_stop_watch);

    listView = (ListView) findViewById(R.id.listViewInStopWatch);
    timerList = new ArrayList<String>();


    timerList.add("00:00:000");
    timerList.add("00:00:000");
    timerList.add("00:00:000");
    timerList.add("00:00:000");

    customAdapter = new CustomAdapterStopWatch(StopWatch.this, timerList);
    listView.setAdapter(customAdapter);
 }

更新

我修改了如下代码:

public class CustomAdapterStopWatch extends BaseAdapter {

private final LayoutInflater layoutInflater;
Context context;
public static List<TimerState> timerList;
private long startTime = 0L;
private Handler customHandler;
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;
HashMap<ViewHolder,Integer> mHashHolder;
TimerState state;

public CustomAdapterStopWatch(Context context, final List<TimerState> timerList) {

    this.context = context;
    this.timerList = timerList;
    layoutInflater = LayoutInflater.from(context);
    customHandler = new Handler();
    mHashHolder = new HashMap<ViewHolder,Integer>();
    state = new TimerState();

    // assuming you need to update the timer after every second.
    customHandler.postDelayed(new Runnable() {
        @Override
        public void run() {

            for (ViewHolder holder: mHashHolder.keySet()) {
                state = timerList.get(mHashHolder.get(holder));

                // update the state
            }
        }
    }, 1000);
}

 @Override
public View getView(final int position, View convertView, ViewGroup parent) {

    ViewHolder holder = null;

    if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.stop_watch_list_view, null);
        holder = new CustomAdapterStopWatch.ViewHolder();
        holder.timerTextView = (TextView) convertView.findViewById(R.id.timerInListView);
        holder.startTimer = (Button) convertView.findViewById(R.id.startTimerInListView);
        holder.pauseTimer = (Button) convertView.findViewById(R.id.stopTimerInListView);
        holder.timerTextView.setTag(position);
        holder.startTimer.setTag(position);
        holder.pauseTimer.setTag(position);
        convertView.setTag(holder);
        mHashHolder.put(holder,position);

        // Alarm alarm = (Alarm) getItem(position);
    } else {
        // holder is being used again, so need to update its new position
        // following line should be synchronized if timer is updated
        // in a separate thread
        mHashHolder.put(holder, position);
        holder = (CustomAdapterStopWatch.ViewHolder) convertView.getTag();
    }
    holder.timerTextView.setText(timerList.get(position).currentTime);

    holder.startTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            startTime = SystemClock.uptimeMillis();
            if (state.isPaused) {
                state.timeSinceStarted = String.valueOf(SystemClock.uptimeMillis());
                state.isPaused = false;
            } else {
                // nothing
            }

        }
    });


    holder.pauseTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (state.isPaused) {
                state.isPaused = true;
            }
        }
    });

    return convertView;
}


public void startTime(final TextView t) {
     Runnable updateTimerThread = new Runnable() {
        public void run() {
            timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
            updatedTime = timeSwapBuff + timeInMilliseconds;
            int secs = (int) (updatedTime / 1000);
            int mins = secs / 60;
            secs = secs % 60;
            int milliseconds = (int) (updatedTime % 1000);
            t.setText("" + mins + ":"
                    + String.format("%02d", secs) + ":"
                    + String.format("%03d", milliseconds));
            customHandler.postDelayed(this, 0);
        }
    };
}

但是在我按下按钮后，没有任何反应。我错过了什么吗？

更新 2

 public CustomAdapterStopWatch(Context context, final List<TimerState> timerList) {

    this.context = context;
    this.timerList = timerList;
    layoutInflater = LayoutInflater.from(context);
    customHandler = new Handler();
    mHashHolder = new HashMap<ViewHolder,Integer>();
    state = new TimerState();

    // assuming you need to update the timer after every second.
    customHandler.postDelayed(new Runnable() {
        @Override
        public void run() {

            for (ViewHolder holder: mHashHolder.keySet()) {
                state = timerList.get(mHashHolder.get(holder));

                long tmp;
                if (!state.isPaused) {
                    tmp = SystemClock.uptimeMillis();
                    state.currentTime += tmp - state.timeSinceStarted;
                    state.timeSinceStarted = tmp;
                }
                updatedTime = state.currentTime;
                int secs = (int) (updatedTime / 1000);
                int mins = secs / 60;
                secs = secs % 60;
                int milliseconds = (int) (updatedTime % 1000);
                // set the text of the view in holder
                holder.timerTextView.setText("" + mins + ":"
                        + String.format("%02d", secs) + ":"
                        + String.format("%03d", milliseconds));

                // update the state
            }
        }
    }, 1000);
}

更新 3

public class CustomAdapterStopWatch extends BaseAdapter {

private final LayoutInflater layoutInflater;
Context context;
public static List<TimerState> timerList;
private long startTime = 0L;
private Handler customHandler;
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;
HashMap<ViewHolder,Integer> mHashHolder;
TimerState state;

public CustomAdapterStopWatch(final Context context, final List<TimerState> timerList) {

    this.context = context;
    this.timerList = timerList;
    layoutInflater = LayoutInflater.from(context);
    customHandler = new Handler();
    mHashHolder = new HashMap<ViewHolder,Integer>();
    state = new TimerState();

    // assuming you need to update the timer after every second.

    customHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            for (ViewHolder holder: mHashHolder.keySet()) {
                state = timerList.get(mHashHolder.get(holder));

                long tmp = 0;
                if (!state.isPaused) {
                    tmp = SystemClock.uptimeMillis();
                    state.currentTime += tmp - state.timeSinceStarted;
                    state.timeSinceStarted = tmp;
                }
                updatedTime = state.currentTime;
                int secs = (int) (updatedTime / 1000);
                int mins = secs / 60;
                secs = secs % 60;
                int milliseconds = (int) (updatedTime % 1000);
                // set the text of the view in holder
                holder.timerTextView.setText("" + mins + ":"
                        + String.format("%02d", secs) + ":"
                        + String.format("%03d", milliseconds));
              //  notifyDataSetChanged();
                Toast.makeText(context,"I got here", Toast.LENGTH_SHORT).show();
                // update the state
            }
            customHandler.postDelayed(this, 1000);
        }
    }, 1000);
}

@Override
public int getCount() {
    return timerList.size();
}

@Override
public Object getItem(int position) {
    return timerList.get(position);
}


@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    ViewHolder holder = null;

    if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.stop_watch_list_view, null);
        holder = new CustomAdapterStopWatch.ViewHolder();
        holder.timerTextView = (TextView) convertView.findViewById(R.id.timerInListView);
        holder.startTimer = (Button) convertView.findViewById(R.id.startTimerInListView);
        holder.pauseTimer = (Button) convertView.findViewById(R.id.stopTimerInListView);
        holder.timerTextView.setTag(position);
        holder.startTimer.setTag(position);
        holder.pauseTimer.setTag(position);
        convertView.setTag(holder);
        mHashHolder.put(holder,position);

        // Alarm alarm = (Alarm) getItem(position);
    } else {
        // holder is being used again, so need to update its new position
        // following line should be synchronized if timer is updated
        // in a separate thread
        mHashHolder.put(holder, position);
        holder = (CustomAdapterStopWatch.ViewHolder) convertView.getTag();
    }
    holder.timerTextView.setText(String.valueOf(timerList.get(position)));

    holder.startTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            startTime = SystemClock.uptimeMillis();
            if (state.isPaused) {
                state.timeSinceStarted = SystemClock.uptimeMillis();
                state.isPaused = false;



            } else {
                // nothing
            }

        }
    });

    holder.pauseTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (!state.isPaused) {
                state.isPaused = true;
            }
        }
    });

    return convertView;
}


public void startTime(final TextView t) {
     Runnable updateTimerThread = new Runnable() {
        public void run() {
            timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
            updatedTime = timeSwapBuff + timeInMilliseconds;
            int secs = (int) (updatedTime / 1000);
            int mins = secs / 60;
            secs = secs % 60;
            int milliseconds = (int) (updatedTime % 1000);
            t.setText("" + mins + ":"
                    + String.format("%02d", secs) + ":"
                    + String.format("%03d", milliseconds));
            customHandler.postDelayed(this, 0);
        }
    };
}
private class ViewHolder {

    TextView timerTextView;
    Button startTimer;
    Button pauseTimer;
 }
}

最佳答案

实际上你做错了两件事。

  1. 您为每个计时器使用相同的变量 updateTime。相反，您应该为每个计时器维护一个状态。所以最好为此开设一个单独的类(class)。例如

    class TimerState {     boolean isPaused = true;     long currentTime = 0;     String timeSinceStarted;    // matters only when the timer is started  }

So pass the array list of above class to your adapter. So that timerList will be arrayList of TimerState.

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_stop_watch);

    listView = (ListView) findViewById(R.id.listViewInStopWatch);
    timerList = new ArrayList<TimerState>();


    timerList.add(new TimerState());
    timerList.add(new TimerState());
    timerList.add(new TimerState());
    timerList.add(new TimerState());

    customAdapter = new CustomAdapterStopWatch(StopWatch.this, timerList);
    listView.setAdapter(customAdapter);

 }
  1. 这个有点棘手。适配器所做的是重用 View ，并且您正在更新某些 View 项的计时器(使用 postDelayed)，即使它对用户不可见。因此，您应该只更新用户可见的那些 View 的计时器。我正在创建一个 HashMap ，它将保留用户可见的所有 View 的持有者，并且我们将有一个可运行的对象，它将仅更新那些 View 。

你的适配器将是

    public class CustomAdapterStopWatch extends BaseAdapter {    private final LayoutInflater layoutInflater;    Context context;    public static List timerList;    private long startTime = 0L;    private Handler customHandler;    long timeInMilliseconds = 0L;    long timeSwapBuff = 0L;    long updatedTime = 0L;    // this will contain the holder of all visible views    HashMap mHashHolder;    public CustomAdapterStopWatch(Context context, List timerList) {        this.context = context;        this.timerList = timerList;        layoutInflater = LayoutInflater.from(context);        customHandler = new Handler();        // assuming you need to update the timer after every second.        customHandler.postDelayed(new Runnable() {                @Override                public void run() {                    TimerState state;                    for (ViewHolderItem holder: mHashHolder.keySet()) {                        state = timerList.get(mHashHolder.get(holder));                        long tmp;                        if (!state.isPaused) {                           tmp = SystemClock.uptimeMillis();                           state.currentTime += tmp - state.timeSinceStarted)                           state.timeSinceStarted = tmp;                        }                        updatedTime = state.currentTime                        int secs = (int) (updatedTime / 1000);                        int mins = secs / 60;                        secs = secs % 60;                        int milliseconds = (int) (updatedTime % 1000);                        // set the text of the view in holder                        holder.t.setText("" + mins + ":"                          + String.format("%02d", secs) + ":"                          + String.format("%03d", milliseconds));                    }                    customHandler.postDelayed(this, 1000);                }         }, 1000);    }    @Override    public int getCount() {        return timerList.size();    }    @Override    public Object getItem(int position) {        return timerList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        final ViewHolder holder;        if (convertView == null) {            convertView = layoutInflater.inflate(R.layout.stop_watch_list_view, null);            holder = new CustomAdapterStopWatch.ViewHolder();            holder.timerTextView = (TextView) convertView.findViewById(R.id.timerInListView);            holder.startTimer = (Button) convertView.findViewById(R.id.startTimerInListView);            holder.pauseTimer = (Button) convertView.findViewById(R.id.stopTimerInListView);            holder.timerTextView.setTag(position);            holder.startTimer.setTag(position);            holder.pauseTimer.setTag(position);            convertView.setTag(holder);            mHashHolder.put(position, holder);            // Alarm alarm = (Alarm) getItem(position);        } else {            // holder is being used again, so need to update its new position            // following line should be synchronized if timer is updated            // in a separate thread            holder = (CustomAdapterStopWatch.ViewHolder) convertView.getTag();            mHashHolder.put(holder, position)        }        holder.timerTextView.setText(timerList.get(position));        holder.startTimer.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startTime = SystemClock.uptimeMillis();                if (state.isPaused) {                    state.timeSinceStarted = SystemClock.uptimeMillis();                    state.isPaused = false;                } else {                   // nothing                }                // logic for showing the timer will be in onScroll method            }        });        holder.pauseTimer.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (!state.isPaused) {                    state.isPaused = True                }            }        });        return convertView;    }

关于android - ListView 中的多个秒表计时器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40283183/

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