android - 试图让 BarChart 与 Firebase 一起工作

Question

所以我正在尝试让 BarChart 与 Firebase 一起工作。目前，我使用 com.github.PhilJay:MPAndroidChart:v2.2.4 作为图表库。

我想出了加载图表的办法，但是在我更新数据后，我收到了这条错误消息，说明了这一点

java.lang.IllegalArgumentException: One or more of the DataSet Entry arrays are longer than the x-values array of this ChartData object. 

我不知道如何让 Firebase 与 MPAndroidChart 一起工作。

下面是代码。

activity_history.xml

<com.github.mikephil.charting.charts.BarChart 
  android:id="@+id/statistik_chart" 
  android:layout_width="match_parent" 
  android:layout_height="550px"
  android:layout_marginTop="16dp" />

HistoryActivity.java

private FirebaseAuth firebaseAuth;
private FirebaseAuth.AuthStateListener authStateListener;
private DatabaseReference referenceTicket;

public class HistoryActivity extends AppCompatActivity {

  private String uid;
  private Long now_ms;
  private BarChart chart;

  private ArrayList < BarEntry > entries;
  private ArrayList < String > labels;
  private BarDataSet barDataSet;
  private BarData barData;

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

    firebaseAuth = FirebaseAuth.getInstance();
    uid = firebaseAuth.getUid();

    entries = new ArrayList < > ();
    labels = new ArrayList < > ();

    chart = findViewById(R.id.statistik_chart);
    String myDate = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(new Date()) + " 23:59:59";
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
    SimpleDateFormat format_tanggal = new SimpleDateFormat("yyyy-MM-dd");

    Date date = null;
    try {
      date = sdf.parse(myDate);
    } catch (ParseException e) {
      e.printStackTrace();
    }

    now_ms = date.getTime();
    referenceTicket = FirebaseDatabase.getInstance().getReference("log");
    Query query_ticket = referenceTicket.orderByChild("created_date").endAt(now_ms);
    query_ticket.addValueEventListener(new ValueEventListener() {
      @Override
      public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        int total_pengunjung = (int) dataSnapshot.getChildrenCount();
        total_pengunjung_today.setText(String.valueOf(total_pengunjung));
      }

      @Override
      public void onCancelled(@NonNull DatabaseError databaseError) {

      }
    });

    labels.add("Jan");
    labels.add("Feb");
    labels.add("Mar");
    labels.add("Apr");
    labels.add("May");
    labels.add("Jun");

    try {
      String current_date_time = new SimpleDateFormat("2019-01-01", Locale.getDefault()).format(new Date()) + " 08:00:00";
      Date date_current = sdf.parse(current_date_time);
      Date convertedDate = dateFormat.parse(current_date_time);
      Calendar last_day_current_cal = Calendar.getInstance();
      last_day_current_cal.setTime(convertedDate);
      last_day_current_cal.set(Calendar.DAY_OF_MONTH, last_day_current_cal.getActualMaximum(Calendar.DAY_OF_MONTH));
      String last_day_current_string = format_tanggal.format(last_day_current_cal.getTime()) + " 18:00:00";
      Date last_day_current_date = sdf.parse(last_day_current_string);
      final long current_start_ms = date_current.getTime();
      final long current_last_ms = last_day_current_date.getTime();
      Query query_ticket_filter = referenceTicket.orderByChild("created_date").startAt(current_start_ms).endAt(current_last_ms);
      query_ticket_filter.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          int total_pengunjung = (int) dataSnapshot.getChildrenCount();
          int i = 0;
          AddValuesToEntry(total_pengunjung, i);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {}
      });

    } catch (ParseException e) {
      e.printStackTrace();
    }

    try {
      String current_date_time = new SimpleDateFormat("2019-02-01", Locale.getDefault()).format(new Date()) + " 08:00:00";
      Date date_current = sdf.parse(current_date_time);
      Date convertedDate = dateFormat.parse(current_date_time);
      Calendar last_day_current_cal = Calendar.getInstance();
      last_day_current_cal.setTime(convertedDate);
      last_day_current_cal.set(Calendar.DAY_OF_MONTH, last_day_current_cal.getActualMaximum(Calendar.DAY_OF_MONTH));
      String last_day_current_string = format_tanggal.format(last_day_current_cal.getTime()) + " 18:00:00";
      Date last_day_current_date = sdf.parse(last_day_current_string);
      final long current_start_ms = date_current.getTime();
      final long current_last_ms = last_day_current_date.getTime();
      Query query_ticket_filter = referenceTicket.orderByChild("created_date").startAt(current_start_ms).endAt(current_last_ms);
      query_ticket_filter.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          int total_pengunjung = (int) dataSnapshot.getChildrenCount();
          int i = 1;
          AddValuesToEntry(total_pengunjung, i);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {}
      });

    } catch (ParseException e) {
      e.printStackTrace();
    }

    try {
      String current_date_time = new SimpleDateFormat("2019-03-01", Locale.getDefault()).format(new Date()) + " 08:00:00";
      Date date_current = sdf.parse(current_date_time);
      Date convertedDate = dateFormat.parse(current_date_time);
      Calendar last_day_current_cal = Calendar.getInstance();
      last_day_current_cal.setTime(convertedDate);
      last_day_current_cal.set(Calendar.DAY_OF_MONTH, last_day_current_cal.getActualMaximum(Calendar.DAY_OF_MONTH));
      String last_day_current_string = format_tanggal.format(last_day_current_cal.getTime()) + " 18:00:00";
      Date last_day_current_date = sdf.parse(last_day_current_string);
      final long current_start_ms = date_current.getTime();
      final long current_last_ms = last_day_current_date.getTime();
      Query query_ticket_filter = referenceTicket.orderByChild("created_date").startAt(current_start_ms).endAt(current_last_ms);
      query_ticket_filter.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          int total_pengunjung = (int) dataSnapshot.getChildrenCount();
          int i = 1;
          AddValuesToEntry(total_pengunjung, i);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {}
      });

    } catch (ParseException e) {
      e.printStackTrace();
    }

    try {
      String current_date_time = new SimpleDateFormat("2019-04-01", Locale.getDefault()).format(new Date()) + " 08:00:00";
      Date date_current = sdf.parse(current_date_time);
      Date convertedDate = dateFormat.parse(current_date_time);
      Calendar last_day_current_cal = Calendar.getInstance();
      last_day_current_cal.setTime(convertedDate);
      last_day_current_cal.set(Calendar.DAY_OF_MONTH, last_day_current_cal.getActualMaximum(Calendar.DAY_OF_MONTH));
      String last_day_current_string = format_tanggal.format(last_day_current_cal.getTime()) + " 18:00:00";
      Date last_day_current_date = sdf.parse(last_day_current_string);
      final long current_start_ms = date_current.getTime();
      final long current_last_ms = last_day_current_date.getTime();
      Query query_ticket_filter = referenceTicket.orderByChild("created_date").startAt(current_start_ms).endAt(current_last_ms);
      query_ticket_filter.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          int total_pengunjung = (int) dataSnapshot.getChildrenCount();
          int i = 1;
          AddValuesToEntry(total_pengunjung, i);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {}
      });

    } catch (ParseException e) {
      e.printStackTrace();
    }

    try {
      String current_date_time = new SimpleDateFormat("2019-05-01", Locale.getDefault()).format(new Date()) + " 08:00:00";
      Date date_current = sdf.parse(current_date_time);
      Date convertedDate = dateFormat.parse(current_date_time);
      Calendar last_day_current_cal = Calendar.getInstance();
      last_day_current_cal.setTime(convertedDate);
      last_day_current_cal.set(Calendar.DAY_OF_MONTH, last_day_current_cal.getActualMaximum(Calendar.DAY_OF_MONTH));
      String last_day_current_string = format_tanggal.format(last_day_current_cal.getTime()) + " 18:00:00";
      Date last_day_current_date = sdf.parse(last_day_current_string);
      final long current_start_ms = date_current.getTime();
      final long current_last_ms = last_day_current_date.getTime();
      Query query_ticket_filter = referenceTicket.orderByChild("created_date").startAt(current_start_ms).endAt(current_last_ms);
      query_ticket_filter.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          int total_pengunjung = (int) dataSnapshot.getChildrenCount();
          int i = 1;
          AddValuesToEntry(total_pengunjung, i);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {}
      });

    } catch (ParseException e) {
      e.printStackTrace();
    }

    try {
      String current_date_time = new SimpleDateFormat("2019-06-01", Locale.getDefault()).format(new Date()) + " 08:00:00";
      Date date_current = sdf.parse(current_date_time);
      Date convertedDate = dateFormat.parse(current_date_time);
      Calendar last_day_current_cal = Calendar.getInstance();
      last_day_current_cal.setTime(convertedDate);
      last_day_current_cal.set(Calendar.DAY_OF_MONTH, last_day_current_cal.getActualMaximum(Calendar.DAY_OF_MONTH));
      String last_day_current_string = format_tanggal.format(last_day_current_cal.getTime()) + " 18:00:00";
      Date last_day_current_date = sdf.parse(last_day_current_string);
      final long current_start_ms = date_current.getTime();
      final long current_last_ms = last_day_current_date.getTime();
      Query query_ticket_filter = referenceTicket.orderByChild("created_date").startAt(current_start_ms).endAt(current_last_ms);
      query_ticket_filter.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          int total_pengunjung = (int) dataSnapshot.getChildrenCount();
          int i = 1;
          AddValuesToEntry(total_pengunjung, i);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {}
      });

    } catch (ParseException e) {
      e.printStackTrace();
    }

  }

  public void AddValuesToEntry(int val, int x) {
    entries.add(new BarEntry(val, x));
    barDataSet = new BarDataSet(entries, "12 Bulan");
    barData = new BarData(labels, barDataSet);
    chart.notifyDataSetChanged();
    chart.setData(barData);
    chart.animateY(3000);
  }

}

任何帮助将不胜感激。谢谢。

Answer 1

删除以下行:

labels.add("Jan");
labels.add("Feb");
labels.add("Mar");
labels.add("Apr");
labels.add("May");
labels.add("Jun");

更改以下代码:

public void AddValuesToEntry(int val, int x)
{
    entries.add(new BarEntry(val, x));
    barDataSet = new BarDataSet(entries, "12 Bulan");
    barData = new BarData(labels, barDataSet);
    chart.notifyDataSetChanged();
    chart.setData(barData);
    chart.animateY(3000);
}

收件人:

public void AddValuesToEntry(int val, int x)
{
    entries.add(new BarEntry(val, x));
    labels.add("insert label for each entry here respectively");
    barDataSet = new BarDataSet(entries, "12 Bulan");
    barData = new BarData(labels, barDataSet);
    chart.notifyDataSetChanged();
    chart.setData(barData);
    chart.animateY(3000);
    chart.invalidate();
}