我有一个 RecyclerView，当它被点击(长按和短按)时会启动一个新的 Activity。当我单击它时，相应的操作将被执行 3 次(有时是 2 次)，无论如何，当我只想执行一次时，它会被执行多次。有一个线程处理这些操作，但该线程只执行一次。
序列的快速运行是:
- recyclerview 已加载，用户可以长按或快速单击列表中的项目。
- 快速单击会调用
openConversation()方法，该方法将启动一个新 Activity (在当前版本中它会多次启动该 Activity ，因为 Activity 堆栈有 2-3 个已启动 Activity 的实例) - 或者，如果在
openConversation()中启动 Activity 的 boolean 条件为 false，则发送 toast 消息(在这个错误中，toast 在我的测试中显示了 3 次) - 明智的做法是长按启动的 Activity 会启动 2-3 次，而它应该只启动一次，因为 Activity 堆栈中有多个实例
public class EventListActivity extends AppCompatActivity implements
NavigationView.OnNavigationItemSelectedListener {
private static final int VIBRATE_MILLISECONDS = 50;
private static final int REFRESH_ANI_MILLIS = 2500;
final Handler handler = new Handler();
private Context applicationContext;
private List<ParseObject> eventList;
final Runnable updateEventsHard = new Runnable() {
@Override
public void run() {
updateEventCards(true);
}
};
final Runnable updateEventsSoft = new Runnable() {
@Override
public void run() {
updateEventCards(false);
}
};
final Runnable initSwipeRefresh = new Runnable() {
@Override
public void run() {
initSwipeRefresh();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_event_list);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
applicationContext = getApplicationContext();
handler.post(updateEventsHard);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
View headerLayout = navigationView.inflateHeaderView(R.layout.nav_header_event_list);
TextView headerUsername = (TextView) headerLayout.findViewById(R.id.drawer_username);
headerUsername.setText(CurrentActiveUser.getInstance().getUsername());
handler.post(initSwipeRefresh);
}
private void initSwipeRefresh() {
final SwipeRefreshLayout swipeView = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
swipeView.setColorSchemeResources(android.R.color.holo_blue_dark, android.R.color.holo_blue_light, android.R.color.holo_green_light, android.R.color.holo_green_light);
swipeView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
swipeView.setRefreshing(true);
(new Handler()).postDelayed(new Runnable() {
@Override
public void run() {
updateEventCards(true);
swipeView.setRefreshing(false);
}
}, REFRESH_ANI_MILLIS);
}
});
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
switch (id) {
case (R.id.nav_my_profile):
Dialog.makeDialog(EventListActivity.this, getString(R.string.upcoming),
getString(R.string.profile_upcoming));
break;
case (R.id.nav_logout):
CurrentActiveUser.getInstance().logout();
Intent intent = new Intent(applicationContext, LoginActivity.class);
startActivity(intent);
finish();
break;
case (R.id.nav_share):
Intent share = new Intent(Intent.ACTION_SEND);
share.setType(StringResources.PLAIN_CONTENT_TYPE);
share.putExtra(Intent.EXTRA_TEXT, R.string.app_share);
startActivity(Intent.createChooser(share, getString(R.string.app_share_title)));
break;
case (R.id.nav_about):
Intent aboutIntent = new Intent(applicationContext, AboutActivity.class);
startActivity(aboutIntent);
break;
case (R.id.nav_legal):
Intent legalIntent = new Intent(applicationContext, LegalActivity.class);
startActivity(legalIntent);
break;
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
//display clickable a list of all users
@SuppressWarnings("unchecked")
private void updateEventCards(Boolean hard) {
ArrayList<EventObject> eventObjects = new ArrayList<>();
if (NetworkState.isConnected(applicationContext)) {
Query<ParseObject> query = new Query<>(Events.class);
query.orderByASC(Events.START_TIME);
if (hard) {
eventList = query.executeHard();
} else {
eventList = query.execute();
}
ParseObject current;
if (eventList != null) {
if (eventList.size() > 0) {
for (int i = 0; i < eventList.size(); i++) {
current = eventList.get(i);
eventObjects.add(
new EventObject(
current.getString(Events.NAME),
current.getString(Events.LOCATION),
current.getLong(Events.START_TIME),
current.getLong(Events.END_TIME),
current.getString(Events.IMAGE)
)
);
}
} else {
Dialog.makeToast(applicationContext, getString(R.string.no_events));
}
} else {
Dialog.makeToast(applicationContext, getString(R.string.error_loading_events));
}
} else {
Dialog.makeToast(applicationContext, getString(R.string.no_network));
}
attachToEventListAdapter(eventObjects);
}
private void attachToEventListAdapter(ArrayList<EventObject> eventObjects) {
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(applicationContext));
eventListClickListener(recyclerView);
EventListAdapter mAdapter = new EventListAdapter(eventObjects, applicationContext);
recyclerView.setAdapter(mAdapter);
recyclerView.setItemAnimator(new DefaultItemAnimator());
}
private synchronized void eventListClickListener(RecyclerView recyclerView) {
recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(
EventListActivity.this, recyclerView,
new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Log.d("Click", "Quick");
openConversation(eventList.get(position));
}
@Override
public void onItemLongClick(View view, int position) {
Vibrator vibe = (Vibrator) applicationContext.getSystemService(Context.VIBRATOR_SERVICE);
vibe.vibrate(VIBRATE_MILLISECONDS);
openEventInfo(eventList.get(position));
}
}));
}
private void openConversation(ParseObject event) {
Live status = DateVerifier.goLive(event.getLong(Events.START_TIME), event.getLong(Events.END_TIME));
if (status.goLive()) {
Intent intent = new Intent(applicationContext, MessagingActivity.class);
intent.putExtra(IntentKeys.EVENT_ID, event.getObjectId());
intent.putExtra(IntentKeys.EVENT_NAME, event.getString(Events.NAME));
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
} else {
Dialog.makeToast(applicationContext, String.valueOf(System.currentTimeMillis() % 1000));
}
}
private void openEventInfo(ParseObject event) {
Intent intent = new Intent(applicationContext, EventInfoActivity.class);
intent.putExtra(IntentKeys.EVENT_NAME, event.getString(Events.NAME));
intent.putExtra(IntentKeys.EVENT_INFO, event.getString(Events.INFO));
intent.putExtra(IntentKeys.EVENT_CARD, event.getString(Events.MATCH_CARD));
intent.putExtra(IntentKeys.EVENT_IMAGE, event.getString(Events.IMAGE));
intent.putExtra(IntentKeys.EVENT_START_TIME, event.getLong(Events.START_TIME));
intent.putExtra(IntentKeys.EVENT_LOCATION, event.getString(Events.LOCATION));
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
public void onStart(){
super.onStart();
handler.post(updateEventsSoft);
}
public void onResume() {
super.onResume();
handler.post(updateEventsSoft);
}
}
最佳答案
我认为您的事件被触发了 3 次，因为每次在您的 RecyclerView 上您都在调用 .addOnItemTouchListener()，它每次都会添加一个新的监听器。
您的方法 eventListClickListener() 只能在您的 onCreate() 中调用一次，而不是每次都在您的 updateEventsHard() 或 updateEventsSoft()。
关于java - Recycler View onClick 被多次调用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35462407/