다음과 같이 fragment에 그래프를 넣고 테스트를 진행을 해보았는데요
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.github.mikephil.charting.animation.Easing;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.charts.PieChart;
import com.github.mikephil.charting.components.Description;
import com.github.mikephil.charting.data.PieData;
import com.github.mikephil.charting.data.PieDataSet;
import com.github.mikephil.charting.data.PieEntry;
import com.github.mikephil.charting.utils.ColorTemplate;
import java.util.ArrayList;
public class Activity_Graphy extends Fragment {
PieChart pieChart;
View v;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
//inflate메소드는 XML데이터를 가져와서 실제 View객체로 만드는 작업을 합니다.
v = inflater.inflate(R.layout.activity_graphy, container, false);
pieChart = (PieChart)getActivity().findViewById(R.id.piechart);
pieChart.setUsePercentValues(true);
pieChart.getDescription().setEnabled(false);
pieChart.setExtraOffsets(5,10,5,5);
pieChart.setDragDecelerationFrictionCoef(0.95f);
pieChart.setDrawHoleEnabled(false);
pieChart.setHoleColor(Color.WHITE);
pieChart.setTransparentCircleRadius(61f);
ArrayList<PieEntry> yValues = new ArrayList<PieEntry>();
yValues.add(new PieEntry(34f,"Japen"));
yValues.add(new PieEntry(23f,"USA"));
yValues.add(new PieEntry(14f,"UK"));
yValues.add(new PieEntry(35f,"India"));
yValues.add(new PieEntry(40f,"Russia"));
yValues.add(new PieEntry(40f,"Korea"));
Description description = new Description();
description.setText("세계 국가"); //라벨
description.setTextSize(15);
pieChart.setDescription(description);
pieChart.animateY(1000, Easing.EasingOption.EaseInOutCubic); //애니메이션
PieDataSet dataSet = new PieDataSet(yValues,"Countries");
dataSet.setSliceSpace(3f);
dataSet.setSelectionShift(5f);
dataSet.setColors(ColorTemplate.JOYFUL_COLORS);
PieData data = new PieData((dataSet));
data.setValueTextSize(10f);
data.setValueTextColor(Color.YELLOW);
pieChart.setData(data);
return v;
}
}implementation 'com.github.PhilJay:MPAndroidChart:v3.0.3'
작성한 fragment로 화면전환을 시도 했을때에 다음과 같은 에러 로그가 출력이 되는데 뭐가 문제인지 모르겠어서 이렇게 질문드립니다.
07-23 23:06:24.485 27391-27391/com.test.testE/AndroidRuntime: FATAL EXCEPTION: main
Process: com.uninno.vibraoscillator, PID: 27391
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.github.mikephil.charting.charts.PieChart.setUsePercentValues(boolean)' on a null object reference
at com.uninno.vibraoscillator.Activity_Graphy.onCreateView(Activity_Graphy.java:36)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2346)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1428)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1759)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1827)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2596)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2383)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2338)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2245)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:703)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
