将数据从一个片段传递到另一个

Question

我知道，此问题已在此站点和其他站点中存在，但我仍然尝试查找解决方案，因为到目前为止，每个解决方案都失败了。

我有一个活动，其中包含2个片段。在第一个Fragment中，我有5个EditText，此输入我需要传递到第二个Fragment，但是...我在此Package中也有一个Java类，它必须使用此输入的值，结果我必须显示在第二个片段中。 这是一个普通的计算器。

这是我的第一个片段：

package com.example.afotel;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class gyorsSzam extends Fragment {

    EditText gradeFive, gradeFour, gradeThree, gradeTwo, gradeOne;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_gyors_szam, container, false);
        Button calculate = (Button) view.findViewById(R.id.gGyors);

        gradeFive = (EditText) view.findViewById(R.id.numberOfGardeFive);
        gradeFour = (EditText) view.findViewById(R.id.numberOfGardeFour);
        gradeThree = (EditText) view.findViewById(R.id.numberOfGardeThree);
        gradeTwo = (EditText) view.findViewById(R.id.numberOfGardeTwo);
        gradeOne = (EditText) view.findViewById(R.id.numberOfGardeOne);

        calculate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction fr = getFragmentManager().beginTransaction();
                fr.replace(R.id.gyorsSzamlalas, new jegyekFelLe());
                fr.commit();

                String gradeFiveSt = gradeFive.getText().toString();
                String gradeFourSt = gradeFour.getText().toString();
                String gradeThreeSt = gradeThree.getText().toString();
                String gradeTwoSt = gradeTwo.getText().toString();
                String gradeOneeSt = gradeOne.getText().toString();

                Bundle bundle = new Bundle();
                bundle.putString("Five", gradeFiveSt );
                bundle.putString("Four", gradeFourSt );
                bundle.putString("Three", gradeThreeSt );
                bundle.putString("Two", gradeTwoSt );
                bundle.putString("Ones", gradeOneeSt );

            }
        });

        return view;
    }
}

这是我的第二个片段：

package com.example.afotel;


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 android.widget.EditText;
import android.widget.TextView;

public class jegyekFelLe extends Fragment {


    public jegyekFelLe() {


    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_jegyek_fel_le, container, false);

        Bundle bundle = getArguments();

        String gradeFive = bundle.getString("Five");
        String gradeFour = bundle.getString("Four");
        String gradeThree  = bundle.getString("Three");
        String gradeTwo = bundle.getString("Two");
        String gradeOne = bundle.getString("One");

        TextView upFive = (TextView) rootView.findViewById(R.id.upFive);
        upFive.setText(gradeFive);

        TextView felNegyes = (TextView) rootView.findViewById(R.id.);
        upFour.setText(gradeFour);

        TextView upThree= (TextView) rootView.findViewById(R.id.upThree);
        upThree.setText(gradeThree);

        TextView upTwo = (TextView) rootView.findViewById(R.id.upTwo);
        upTwo.setText(gradeTwo);

        TextView downOne = (TextView) rootView.findViewById(R.id.dowbOne);
        leEgyes.setText(gradeOne);

        return rootView;
    }
}

如果代码包含TextView upFive ...（等）部分，如果单击“计算”按钮，程序将崩溃。我不知道这是什么问题，因为我做了这部视频所说的一切：https://www.youtube.com/watch?v=_4i5Jk5RnFA

我知道，此示例中未使用Java类，这是因为我的代码存在此问题。首先，我想知道如何在两个Fragment之间传递数据，然后编写以计算这5个EditText所需的结果。 我是Android Studio的入门者，因此我需要简单，难以理解的解决方案。

希望您能理解我的问题，对不起我的英语。

Answer 1

设置包并在提交事务之前向片段添加参数。您可能需要将代码更改为以下结构：

    Bundle bundle= new Bundle();
    //add items to the bundle then begin transacting
    Fragment jegyekFelLe= new jegyekFelLe();
    jegyekFelLe.setArguments(bundle);
    FragmentTransaction fr = getFragmentManager().beginTransaction();
    fr.replace(R.id.gyorsSzamlalas,jegyekFelLe );
    fr.commit();

Answer 2

您没有将捆绑软件作为片段中的参数传递

*将数据从片段A发送到片段B

jom: C:\Users\Klaas\OneDrive\Universiteit\Year 3\Computer Graphics\Assignment 
1\build-OpenGL_transformations-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\Makefile.Debug [debug\user_input.obj] Error 2
jom: C:\Users\Klaas\OneDrive\Universiteit\Year 3\Computer Graphics\Assignment 1\build-OpenGL_transformations-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\Makefile.Debug [debug\model.obj] Error 2
jom: C:\Users\Klaas\OneDrive\Universiteit\Year 3\Computer Graphics\Assignment 1\build-OpenGL_transformations-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\Makefile.Debug [debug\main.obj] Error 2
jom: C:\Users\Klaas\OneDrive\Universiteit\Year 3\Computer Graphics\Assignment 1\build-OpenGL_transformations-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\Makefile.Debug [debug\mainview.obj] Error 2
jom: C:\Users\Klaas\OneDrive\Universiteit\Year 3\Computer Graphics\Assignment 1\build-OpenGL_transformations-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\Makefile.Debug [debug\mainwindow.obj] Error 2
jom: C:\Users\Klaas\OneDrive\Universiteit\Year 3\Computer Graphics\Assignment 1\build-OpenGL_transformations-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\Makefile [debug] Error 2
13:15:36: The process "D:\ProgramFiles\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project OpenGL_transformations (kit: Desktop Qt 5.12.1 MSVC2017 64bit)
The kit Desktop Qt 5.12.1 MSVC2017 64bit has configuration issues which might be the root cause for this problem.
When executing step "Make"

*从片段a中获取数据

 Bundle bundle= new Bundle();
   bundle.putString("Your_key",data)
   //add items to the bundle then begin transacting
    Fragment fragment= new jegyekFelLe();
        fragment.setArguments(bundle);
    FragmentTransaction fr = getFragmentManager().beginTransaction();
    fr.replace(R.id.gyorsSzamlalas,fragment );
    fr.commit();

Answer 3

1。）您需要使用“活动”的支持片段管理器，而不是片段的子片段管理器

2。），您需要先将arguments捆绑软件交给捆绑软件，然后再将其添加到事务处理的碎片管理器中。

    calculate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String gradeFiveSt = gradeFive.getText().toString();
            String gradeFourSt = gradeFour.getText().toString();
            String gradeThreeSt = gradeThree.getText().toString();
            String gradeTwoSt = gradeTwo.getText().toString();
            String gradeOneeSt = gradeOne.getText().toString();

            FragmentTransaction fr = (((FragmentActivity)getActivity()).getSupportFragmentManager()).beginTransaction();

            Fragment fragment = new jegyekFelLe();
            Bundle bundle = new Bundle();
            bundle.putString("Five", gradeFiveSt );
            bundle.putString("Four", gradeFourSt );
            bundle.putString("Three", gradeThreeSt );
            bundle.putString("Two", gradeTwoSt );
            bundle.putString("Ones", gradeOneeSt );
            fragment.setArguments(bundle);
            fr.replace(R.id.gyorsSzamlalas, fragment);
            fr.commit();
        }

Answer 4

您可以使用模型类执行此操作，示例如下

打包com.example.afotel;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class gyorsSzam extends Fragment {

    EditText gradeFive, gradeFour, gradeThree, gradeTwo, gradeOne;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_gyors_szam, container, false);
        Button calculate = (Button) view.findViewById(R.id.gGyors);

        gradeFive = (EditText) view.findViewById(R.id.numberOfGardeFive);
        gradeFour = (EditText) view.findViewById(R.id.numberOfGardeFour);
        gradeThree = (EditText) view.findViewById(R.id.numberOfGardeThree);
        gradeTwo = (EditText) view.findViewById(R.id.numberOfGardeTwo);
        gradeOne = (EditText) view.findViewById(R.id.numberOfGardeOne);

        calculate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                String gradeFiveSt = gradeFive.getText().toString();
                String gradeFourSt = gradeFour.getText().toString();
                String gradeThreeSt = gradeThree.getText().toString();
                String gradeTwoSt = gradeTwo.getText().toString();
                String gradeOneeSt = gradeOne.getText().toString();

                ModelClass modelClass = new ModelClass();
                modelClass.setFive(gradeFiveSt );
                modelClass.setFour(gradeFourSt );
                modelClass.setThree( gradeThreeSt );
                modelClass.setTwo(gradeTwoSt );
                modelClass.setOnes(gradeOneeSt );

                FragmentTransaction fr = getFragmentManager().beginTransaction();
                fr.replace(R.id.gyorsSzamlalas, new jegyekFelLe(modelClass));
                fr.commit();

            }
        });

        return view;
    }
}


package com.example.afotel;


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 android.widget.EditText;
import android.widget.TextView;

public class jegyekFelLe extends Fragment {
ModelClass modelClass;

    public jegyekFelLe(ModelClass modelClass) {

    this.modelClass = modelClass;

    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_jegyek_fel_le, container, false);

        //Bundle bundle = getArguments();

        //String gradeFive = bundle.getString("Five");
        //String gradeFour = bundle.getString("Four");
        //String gradeThree  = bundle.getString("Three");
        //String gradeTwo = bundle.getString("Two");
        //String gradeOne = bundle.getString("One");

        TextView upFive = (TextView) rootView.findViewById(R.id.upFive);
        upFive.setText(modelClass.getFive());

        TextView felNegyes = (TextView) rootView.findViewById(R.id.);
        upFour.setText(modelClass.getFour());

        TextView upThree= (TextView) rootView.findViewById(R.id.upThree);
        upThree.setText(modelClass.getThree());

        TextView upTwo = (TextView) rootView.findViewById(R.id.upTwo);
        upTwo.setText(modelClass.getTwo());

        TextView downOne = (TextView) rootView.findViewById(R.id.dowbOne);
        leEgyes.setText(modelClass.getOnes());

        return rootView;
    }
}


public class ModelClass {
    private String Ones;
    private String Two;
    private String Three;
    private String Four;
    private String Five;
    public String getOnes() {
        return Ones;
    }
    public void setOnes(String ones) {
        Ones = ones;
    }
    public String getTwo() {
        return Two;
    }
    public void setTwo(String two) {
        Two = two;
    }
    public String getThree() {
        return Three;
    }
    public void setThree(String three) {
        Three = three;
    }
    public String getFour() {
        return Four;
    }
    public void setFour(String four) {
        Four = four;
    }
    public String getFive() {
        return Five;
    }
    public void setFive(String five) {
        Five = five;
    }



}