Make arraylist parcelable in my code?

Question

Can anybody help me making the arraylist final ArrayList<PieEntry> entries = new ArrayList<>(); Parcelable in my code so I can access it in methods in both fragment a and b

- Fragment a code:

public class SecondFragment extends Fragment {
// Store instance variables
private String title;
private int page;

// newInstance constructor for creating fragment with arguments
public static SecondFragment newInstance(int page, String title) {
    SecondFragment fragmentSecond = new SecondFragment();
    Bundle args = new Bundle();
    args.putInt("someInt", page);
    args.putString("someTitle", title);
    fragmentSecond.setArguments(args);
    return fragmentSecond;
}

// Store instance variables based on arguments passed
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    page = getArguments().getInt("someInt", 0);
    title = getArguments().getString("someTitle");
}

// Inflate the view for the fragment based on layout XML
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.fragment_second, container, false);
    TextView tvLabel2 = (TextView) view.findViewById(R.id.textView2);

    //Alle Objekte hier einfügen (wie textview tvavel2)

    final Button button = (Button) view.findViewById(R.id.button);
    final TextView textView = (TextView) view.findViewById(R.id.textView);
    final TextView textView2 = (TextView) view.findViewById(R.id.textView2);
    final EditText editText = (EditText) view.findViewById(R.id.editText);
    final EditText editText2 = (EditText) view.findViewById(R.id.editText2);
    final EditText editText3 = (EditText) view.findViewById(R.id.editText3);
    final ArrayList<PieEntry> entries = new ArrayList<>();


    button.setOnClickListener(new View.OnClickListener() {
        public void onClick (View view) {



            if (editText3.getText().toString().matches("")) {
                Toast.makeText(getActivity(), "You did not enter a Valid Item ID", Toast.LENGTH_LONG).show();
                return;
            }

            else if (editText2.getText().toString().matches("")) {
                Toast.makeText(getActivity(), "You did not enter a Valid Quantitiy", Toast.LENGTH_LONG).show();
                return;

            }

            else {

                String nomen = (editText3.getText().toString());
                float number = Float.parseFloat(editText2.getText().toString());

                entries.add(new PieEntry(number, nomen));

                editText3.setText("");
                editText2.setText("");
                editText3.requestFocus();
            }
        }
    });

    return view;
}

}

• Fragment b code:

  public class FirstFragment extends Fragment {
  private String title;
  private int page;
  
  
  
  public static FirstFragment newInstance(int page, String title) {
  FirstFragment fragmentFirst = new FirstFragment();
  Bundle args = new Bundle();
  args.putInt("someInt", page);
  args.putString("someTitle", title);
  fragmentFirst.setArguments(args);
  return fragmentFirst;
  }
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  page = getArguments().getInt("someInt", 0);
  title = getArguments().getString("someTitle");
  }
  
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
                       Bundle savedInstanceState) {
      View view = inflater.inflate(R.layout.fragment_first, container, false);
      EditText editText = (EditText) view.findViewById(R.id.editText);
  final PieChart piechart = (PieChart) view.findViewById(R.id.piechart);
  final Button button2 = (Button) view.findViewById(R.id.button2);
  
  new ViewPager.OnPageChangeListener() {
      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  
      }
  
      @Override
      public void onPageSelected(int position) {
  
      }
  
      @Override
      public void onPageScrollStateChanged(int position) {
  
  
      }
  };
  
  button2.setOnClickListener(new View.OnClickListener() {
      public void onClick (View view) {
          getResources().getColor(R.color.violp);
          getResources().getColor(R.color.bluep);
          getResources().getColor(R.color.redp);
          getResources().getColor(R.color.greenp);
          getResources().getColor(R.color.yellowp);
          getResources().getColor(R.color.orangep);
          getResources().getColor(R.color.lightbluep);
          getResources().getColor(R.color.purplep);
          getResources().getColor(R.color.darkredp);
          PieDataSet set = new PieDataSet(entries, "");
          set.setColors(new int[]{R.color.bluep, R.color.greenp, R.color.violp, R.color.redp, R.color.yellowp, R.color.orangep, R.color.lightbluep, R.color.purplep, R.color.darkredp}, getActivity());
          PieData datax = new PieData(set);
          piechart.setData(datax);
          Toast.makeText(getActivity(), (R.string.loading),
                  Toast.LENGTH_SHORT).show();
  
          piechart.setNoDataText(String.valueOf(R.string.nodata));
          piechart.notifyDataSetChanged();
          piechart.animateX(2000, Easing.EasingOption.EaseInExpo);
          piechart.animateY(2000, Easing.EasingOption.EaseInExpo);
  
  
  
          }
  
  
  
      });
  
  
  
  
  
  
  return view;
  }
  

I have tried a number of options so far but I could not get the programm to run. Any help is apprediated. Thanks!

Answer 1

In order to transfer data, we need to parcel it or serialize it. Android OS by default promoting Parcelable instead to Serialization. Serialization is a java concept. In your case, you need to create the "PieEntry" class as Parcelable. For that, you need to implement the Parcelable interface in your model.

Check below implementation.

package com.cludprinting.mysample;

import android.os.Parcel;
import android.os.Parcelable;

/**
 * Created by nithinjith.pp on 05-01-2017.
 * Implement Parcelable in PieEntry.
 * 
 */

public class PieEntry implements Parcelable {

    public static final Parcelable.Creator<PieEntry> CREATOR = new Parcelable.Creator<PieEntry>() {
        @Override
        public PieEntry createFromParcel(Parcel source) {
            return new PieEntry(source);
        }

        @Override
        public PieEntry[] newArray(int size) {
            return new PieEntry[size];
        }
    };

    // These are sample instance variables
   // Add your own instance variable
    private String mName;
    private String mDOB;
    private int mAge;

    public PieEntry(Parcel parcel) {
        this.mName = parcel.readString();
        this.mDOB = parcel.readString();
        this.mAge = parcel.readInt();
    }


    public int getmAge() {
        return mAge;
    }

    public void setmAge(int mAge) {
        this.mAge = mAge;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.mName);
        dest.writeString(this.mDOB);
        dest.writeInt(this.mAge);
    }

    public String getmDOB() {
        return mDOB;
    }

    public void setmDOB(String mDOB) {
        this.mDOB = mDOB;
    }

    public String getmName() {
        return mName;
    }

    public void setmName(String mName) {
        this.mName = mName;
    }
}

The instance variable and access methods may change based on your implemenaton.