Question

任何人都可以帮我制作 arraylist final ArrayList<PieEntry> entries = new ArrayList<>(); 在我的代码中可以分配，因此我可以在片段 a 和 b

中的方法中访问它

- 将代码分段：

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;
}

}

片段b代码：

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;
}

到目前为止，我已经尝试了很多选项，但我无法让程序运行。任何帮助都是经过认证的。的谢谢！

Answer 1

为了传输数据，我们需要对其进行包裹或序列化。 Android操作系统默认情况下将Parcelable提升为序列化。序列化是一个java概念。在您的情况下，您需要创建＆＃34; PieEntry＆＃34;作为Parcelable的类。为此，您需要在模型中实现Parcelable接口。

检查以下实施情况。

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;
    }
}

实例变量和访问方法可能会根据您的实现而改变。

在我的代码中设置arraylist parcelable？

1 个答案: