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Recyclerviewに20個のカスタムカウントアップタイマーのリストがあります。最初に開始すると、14番目または15番目の行でも同じタイマーがテキストビューに表示されます。私はタイマーが最初のtextviewへの参照を保持していると推測し、それは14または15行目で再利用されているそれを継続的に更新しています。どのようにこれを効率的に行うか教えてもらえますか？前もって感謝します。Recyclerviewで古いビューを再利用
MainActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private RecyclerView mRecyclerView;
private CountAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdapter = new CountAdapter(getCount(), this);
mRecyclerView = (RecyclerView) findViewById(R.id.rv);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}
private List<String> getCount() {
List<String> strings = new ArrayList<>();
for (int i = 0; i < 20; i++) {
strings.add(i + "");
}
return strings;
}
}
CountAdapter.java
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ImageButton;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class CountAdapter extends RecyclerView.Adapter<CountAdapter.ViewHolder> {
private static final String TAG = "CountAdapter";
private final List<String> mData;
private final List<CountUpTimer> mCountUpList = new ArrayList<>();
private final ArrayList<Boolean> mSelectedRows = new ArrayList<>();
private final Context mContext;
public CountAdapter(List<String> mData, Context mContext) {
this.mData = mData;
this.mContext = mContext;
mCountUpList.clear();
for (int i = 0; i < mData.size(); i++) {
mCountUpList.add(i, null);
}
mSelectedRows.clear();
for (int i = 0; i < mData.size(); i++) {
mSelectedRows.add(i, false);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item, parent, false);
return new ViewHolder(v, mContext, mCountUpList, mSelectedRows);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
checkTimerStatus(holder, position);
Log.d(TAG, "onBindViewHolder: " + position + " " + String.valueOf(mCountUpList.get(position)));
}
private void checkTimerStatus(final ViewHolder holder, int position) {
CountUpTimer countUpTimer = mCountUpList.get(position);
if (countUpTimer != null) {
Log.d(TAG, "checkTimerStatus: " + position);
countUpTimer.setOnTickListener(new CountUpTimer.OnTickListener() {
@Override
public void OnTick(long elapsed) {
holder.mTimeText.setText(elapsed + "");
}
});
} else {
holder.mTimeText.setText("00:00:00");
}
boolean state = mSelectedRows.get(position);
holder.mCheckBox.setChecked(state);
}
@Override
public int getItemCount() {
return mData.size();
}
static class ViewHolder extends RecyclerView.ViewHolder implements
CountUpTimer.OnTickListener, View.OnClickListener {
private static final String TAG = "ViewHolder";
private final Context mContext;
private final ArrayList<Boolean> mSelectedRows;
private final TextView mTimeText;
private final ImageButton mStartButton;
private final CheckBox mCheckBox;
private final List<CountUpTimer> mCountUpList;
public ViewHolder(View v, Context mContext, List<CountUpTimer> mCountUp,
ArrayList<Boolean> mSelectedRows) {
super(v);
this.mContext = mContext;
this.mCountUpList = mCountUp;
this.mSelectedRows = mSelectedRows;
mTimeText = (TextView) v.findViewById(R.id.itemText);
mStartButton = (ImageButton) v.findViewById(R.id.ibPlay);
mCheckBox = (CheckBox) v.findViewById(R.id.checkBox);
mStartButton.setOnClickListener(this);
mCheckBox.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.ibPlay:
final CountUpTimer upTimer = new CountUpTimer(100);
upTimer.setOnTickListener(this);
upTimer.start();
mCountUpList.set(getAdapterPosition(), upTimer);
break;
case R.id.checkBox:
mSelectedRows.set(getAdapterPosition(),
!mSelectedRows.get(getAdapterPosition()));
break;
}
}
@Override
public void OnTick(long elapsed) {
mTimeText.setText(elapsed + "");
}
}
}
CountUpTimer.java
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
public class CountUpTimer {
private final long interval;
private long base;
public long mElapsedTime;
private OnTickListener onTickListener;
public CountUpTimer(long interval) {
this.interval = interval;
}
public void start() {
base = SystemClock.elapsedRealtime();
handler.sendMessage(handler.obtainMessage(MSG));
}
public void stop() {
handler.removeMessages(MSG);
}
public void reset() {
synchronized (this) {
base = SystemClock.elapsedRealtime();
}
}
public void setOnTickListener(OnTickListener onTickListener) {
this.onTickListener = onTickListener;
}
private static final int MSG = 1;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (CountUpTimer.this) {
long elapsedTime = SystemClock.elapsedRealtime() - base;
if (onTickListener != null) {
mElapsedTime = elapsedTime;
onTickListener.OnTick(elapsedTime);
}
sendMessageDelayed(obtainMessage(MSG), interval);
}
}
};
interface OnTickListener {
void OnTick(long elapsed);
}
}
を動作するかどうかを確認するためにそのことについては
か、単に何かを設定してみてください を更新されるたびに、希望はこれが誰かhttpsのに役立ちます/github.com/saikiran91/Multiple-Timers-in-Recyclerview –