图轴如何给标签

Question

我使用Android Studio https://github.com/PhilJay/MPAndroidChart库完成了Graphs。问题是，

如何使用该库命名轴？

从firebase（如每日，每周，每月）获取数据时，如何使用该库表示图数据？

这些是我的视觉输出

Bar Chart

Line Chart

这些是我的密码

public class DrinkActivity extends Fragment {

private LineChart mChart;
EditText yValue,xValue;
Button btn_insert;

FirebaseDatabase database;
DatabaseReference reference;

ArrayList<Entry> yValues;
LineDataSet set1;

public DrinkActivity() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.activity_drink, container, false);


    mChart = (LineChart)v.findViewById(R.id.linechart);
    xValue=(EditText) v.findViewById(R.id.editText);
    yValue=(EditText) v.findViewById(R.id.editText2);

    btn_insert=(Button) v.findViewById(R.id.button2);


    mChart.setDragEnabled(true);
    mChart.setScaleEnabled(true);

    yValues=new ArrayList<>();

    database= FirebaseDatabase.getInstance();
    reference=database.getReference("ChartTable/LineChart");

    setListeners();


    return  v;
}

private void setListeners() {
    btn_insert.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View view){
            String id=reference.push().getKey();

            int x=Integer.parseInt(xValue.getText().toString());
            int y=Integer.parseInt(yValue.getText().toString());

            PointValue pointValue=new PointValue(x,y);

            reference.child(id).setValue(pointValue);
        }
    });
}

@Override
public void onStart() {
    super.onStart();

    reference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Entry[] dp= new Entry[(int) dataSnapshot.getChildrenCount()];
            int index=0;

            for(DataSnapshot myDataSnapshot: dataSnapshot.getChildren())
            {
                PointValue pointValue=myDataSnapshot.getValue(PointValue.class);
                dp[index]=new Entry(pointValue.getxValue(),pointValue.getyValue());
                yValues.add(dp[index]);
                index++;
            }
            set1=new LineDataSet(yValues,"Data set1");

            set1.setFillAlpha(110);
            set1.setColor(Color.BLUE);
            set1.setLineWidth(3f);
            set1.setValueTextSize(10f);


            LineData data=new LineData(set1);
            mChart.setData(data);

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}
}

谢谢（请考虑我是android studio和firebase的初学者）

（很抱歉在同一问题上问两个不同的问题）