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私はライブラリをアンドロイドスタジオのチャートに使用しています。グラフはアクティビティでうまく表示されていますが、断片的に使用することはできません。別のチャートを使ってみましたが、私は問題を解決することができません。私はグラフにデータを与えているのに、 "No chart data available"というメッセージが表示されます。だから基本的に私は3つのフラグメントMathsFragment、PhysicsFragment、ChemistryFragmentを持つExamPerformanceActivityと呼ばれるアクティビティ（下部のナビゲーションバーを持つ）があります。私は問題に直面しているMathsFragmentに棒グラフを持っています。MPAndroidChartがフラグメントに表示されない
activity_exam_performance.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/activity_main"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.peepstake.vijay.statlog.ExamPerfoActivity">
<FrameLayout
android:id="@+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/navigation"
android:animateLayoutChanges="true">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@color/colorPrimary"
app:itemIconTint="#d5d6d9"
app:itemTextColor="#ffffff"
app:menu="@menu/bottombar_student_items"/>
</RelativeLayout>
ExamPerformanceActivity.java
public class ExamPerformanceActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_exam_performance);
BottomNavigationView bottomNavigationView = (BottomNavigationView)
findViewById(R.id.navigation);
bottomNavigationView.setOnNavigationItemSelectedListener
(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.maths:
selectedFragment = MathsFragment.newInstance();
break;
case R.id.physics:
selectedFragment = PhysicsFragment.newInstance();
break;
case R.id.chemistry:
selectedFragment = ChemistryFragment.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, selectedFragment);
transaction.commit();
return true;
}
});
//Manually displaying the first fragment - one time only
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, MathsFragment.newInstance());
transaction.commit();
//Used to select an item programmatically
//bottomNavigationView.getMenu().getItem(2).setChecked(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
public void goTopicwise(View v){
Intent intent = new Intent(ExamPerformanceActivity.this, TopicwiseActivity.class);
startActivity(intent);
}
}
fragment_maths.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.peepstake.vijay.statlog.Common.MathsFragment">
<com.github.mikephil.charting.charts.BarChart
android:id="@+id/bar"
android:layout_width="match_parent"
android:layout_height="match_parent">
</com.github.mikephil.charting.charts.BarChart>
</FrameLayout>
MathsFragment.java
public class MathsFragment extends Fragment {
BarChart bar;
public static MathsFragment newInstance() {
MathsFragment fragment = new MathsFragment();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public MathsFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view =inflater.inflate(R.layout.fragment_maths, container, false);
Typeface font = Typeface.createFromAsset(getActivity().getAssets(), "fonts/ProductSans.ttf");
bar = (BarChart)view.findViewById(R.id.bar);
List<BarEntry> entries = new ArrayList<>();
entries.add(new BarEntry(0f, 100f,"Total"));
entries.add(new BarEntry(1f, 82f,"Obtained"));
entries.add(new BarEntry(2f, 95f,"Highest"));
entries.add(new BarEntry(3f, 69f,"Average"));
BarDataSet bSet = new BarDataSet(entries, "Marks");
bSet.setColors(ColorTemplate.VORDIPLOM_COLORS);
ArrayList<String> barFactors = new ArrayList<>();
barFactors.add("Total");
barFactors.add("Obtained");
barFactors.add("Highest");
barFactors.add("Average");
XAxis xAxis = bar.getXAxis();
xAxis.setGranularity(1f);
xAxis.setGranularityEnabled(true);
BarData data = new BarData(bSet);
data.setBarWidth(0.9f); // set custom bar width
data.setValueTextSize(12);
Description description = new Description();
description.setTextColor(R.color.colorPrimary);
description.setText("All values in marks");
bar.setDescription(description);
bar.setData(data);
bar.setFitBars(true); // make the x-axis fit exactly all bars
bar.invalidate(); // refresh
bar.getXAxis().setValueFormatter(new IndexAxisValueFormatter(barFactors));
Legend l = bar.getLegend();
l.setFormSize(10f); // set the size of the legend forms/shapes
l.setForm(Legend.LegendForm.CIRCLE); // set what type of form/shape should be used
l.setTypeface(font);
l.setTextSize(12f);
l.setTextColor(Color.BLACK);
List<LegendEntry> lentries = new ArrayList<>();
for (int i = 0; i < barFactors.size(); i++) {
LegendEntry entry = new LegendEntry();
entry.formColor = ColorTemplate.VORDIPLOM_COLORS[i];
entry.label = barFactors.get(i);
lentries.add(entry);
}
l.setXEntrySpace(5f); // set the space between the legend entries on the x-axis
l.setYEntrySpace(5f);
l.setCustom(lentries);
return inflater.inflate(R.layout.fragment_maths, container, false);
}
}
ありがとうございました！あなたはとても役に立ちます。私はそれを非常に感謝します。出来た。 –