Question

在最小化或打开其他应用后，我的内容正在消失，我需要再次填写回收者视图

P.S。在清单中我有

       android:configChanges="orientation|keyboardHidden|screenSize"

recyclerView

    <android.support.v7.widget.RecyclerView
      android:id="@+id/booking_rec"
      android:scrollbars="vertical"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_marginBottom="10dp"
      android:background="#ECEFF1">

   </android.support.v7.widget.RecyclerView>

适配器

public class RecAdapterBooking extends RecyclerView.Adapter<RecAdapterBooking.CustomViewHolder> {
    private List<Booking> bookingList;
    private Context context;

    public RecAdapterBooking(List<Booking> bookingList, Context context) {
        this.bookingList = bookingList;
        this.context = context;
    }

    @Override
    public RecAdapterBooking.CustomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.booking_view_item, parent, false);
        CustomViewHolder viewHolder = new CustomViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(RecAdapterBooking.CustomViewHolder holder, int position) {

        final Booking booking = bookingList.get(position);

        String name = booking.getUser().getFirstName() + " " + booking.getUser().getLastName();
        String date = booking.getStartTime().toString() + " - " + booking.getToTime().toString();

        holder.name.setText(booking.getName());
        holder.user.setText(name);
        holder.dateTime.setText(date);
        holder.type.setText(booking.getType().toString());
    }

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

    public class CustomViewHolder extends RecyclerView.ViewHolder {

        protected TextView name;
        protected TextView user;
        protected TextView dateTime;
        protected TextView type;

        public CustomViewHolder(View view) {
            super(view);
            this.name = (TextView) view.findViewById(R.id.name);
            this.user = (TextView) view.findViewById(R.id.user);
            this.dateTime = (TextView) view.findViewById(R.id.date_time);
            this.type=(TextView) view.findViewById(R.id.booking_type);

        }
    }
}

mainactivity

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

List<Room> roomList = new ArrayList<>();
static List<Booking> bookingList = new ArrayList<>();
static RecyclerView recyclerView;
static RecAdapterBooking recAdapterBooking;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    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();

    final NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    Helper.initList(roomList);

    Menu menu = navigationView.getMenu();

    for (Room r : roomList) {
        menu.add(r.getName());
    }

    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView = (RecyclerView) findViewById(R.id.booking_rec);
    recyclerView.setLayoutManager(layoutManager);

    final Calendar c = Calendar.getInstance();
    final SimpleDateFormat df = new SimpleDateFormat("MMM-dd-yyyy");
    final TextView textView = (TextView) findViewById(R.id.time_view);
    setTime(c, df, textView);

    ImageButton leftButton = (ImageButton) findViewById(R.id.left);
    ImageButton rightButton = (ImageButton) findViewById(R.id.right);
    leftButton.setOnClickListener(new Button.OnClickListener() {
        @Override
        public void onClick(View v) {
            c.add(Calendar.DATE, -1);
            textView.setText(df.format(c.getTime()));
        }
    });
    rightButton.setOnClickListener(new Button.OnClickListener() {
        @Override
        public void onClick(View v) {
            c.add(Calendar.DATE, +1);
            textView.setText(df.format(c.getTime()));
        }
    });

    if (PreferenceManager.getDefaultSharedPreferences(MainActivity.this).getBoolean("pref", true)) {
        Intent intent = new Intent(MainActivity.this, SingleRoomActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
        startActivity(intent);
        this.finish();
    }

}

public void setTime(Calendar c, SimpleDateFormat df, TextView textView) {
    final String formattedDate = df.format(c.getTime());
    textView.setText(formattedDate);
}

@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 onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

//settings-ზე დაჭერის activity
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if (id == R.id.action_settings) {
        ArrayList<String> roomNameList = new ArrayList<>();
        for (Room r : roomList) {
            roomNameList.add(r.getName());
        }
        Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
        intent.putExtra("roomlist", roomNameList);
        startActivity(intent);
    }
    if (id == R.id.action_log_out) {
        Intent intent = new Intent(MainActivity.this, LoginActivity.class);
        startActivity(intent);
    }
    return super.onOptionsItemSelected(item);
}


//მენიუდან არჩეული ოთახის განრიგის გამოტანა
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    for (Room r : roomList) {
        if (item.getTitle().equals(r.getName())) {
            bookingList = r.getBookingList();
            recAdapterBooking = new RecAdapterBooking(bookingList, MainActivity.this);
            recyclerView.setAdapter(recAdapterBooking);
            setTitle(r.getName());
            break;
        }
    }
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

}

Answer 1

这可能是由于生命周期而发生的。当您最小化应用程序时，将在暂停时调用，然后在停止时调用。当您最大化应用程序时，将在“开始”时调用。可能是您在OnCreate上设置了内容。这样，如果您的应用在使用其他应用时被杀死，则再次调用它时，onCreate不会被调用，这样您就不会再次放置内容。

要解决此问题，您也可以在开始或恢复时调用提交列表方法。 OnStart是一种更好的方法。

RecyclerView内容正在消失

1 个答案: