私は特に、フラグメントと私の活動フラグメントの間との間の相互作用が直面しているいくつかの困難を抱えているClickListener
-wise。
私は2つの断片で構成電卓アプリを開発しています:
- 一つの断片はすべて含まれている
Buttons
(数字と演算子を) - 他の2含有
TextViews
(演算結果)を
ここでの目標は、これら2つの断片が互いの間で通信を行うようにすることです。私は、それは(私が(私はClickListenerを入れているれている)ボタンを「等しい」が、私は他のボタンを使用していないか、情報を送るどちらに見えることはできませんをクリックするまでのTextViewに文字と文字列を送信することになっています)インターフェースにもかかわらず、TextViewにはnullであることを私に警告し続けています。
これは、すべてのボタンと演算子を含む断片です。
package fr.android.calculator.Fragments;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import fr.android.calculator.R;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link LowerCalculatorFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link LowerCalculatorFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class LowerCalculatorFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public LowerCalculatorFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment LowerCalculatorFragment.
*/
// TODO: Rename and change types and number of parameters
public static LowerCalculatorFragment newInstance(String param1, String param2) {
LowerCalculatorFragment fragment = new LowerCalculatorFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_lower_calculator, container, false);
Button button = new Button(getContext());
LinearLayout buttonContainer = view.findViewById(R.id.resultButtonFragment);
button.setText("=");
button.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
button.setId(R.id.buttonEqualsFragment);
buttonContainer.addView(button);
button.setOnClickListener(v -> onButtonPressed(v));
return view;
}
public void onViewCreated(View view, @Nullable Bundle savedInstanceState){
super.onViewCreated(view,savedInstanceState);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(View view) {
if (mListener != null) {
mListener.lowerFragmentInteraction(view);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void lowerFragmentInteraction(View view);
}
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".Activities.CalculatorSecondActivity"
android:id="@+id/frameLayout">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="@+id/numberOperators" android:baselineAligned="false">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="@+id/numbers" android:layout_weight="1">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="match_parent" android:id="@+id/SevenToPlus">
<Button
android:text="7"
android:layout_width="0dp"
android:layout_height="match_parent" android:id="@+id/button18" android:layout_weight="1"
android:onClick="onButtonClick"/>
<Button
android:text="8"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button19" android:layout_weight="1"
/>
<Button
android:text="9"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button20" android:layout_weight="1"
/>
<Button
android:text="+"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button21" android:layout_weight="1"
/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="match_parent" android:id="@+id/FourToMinus">
<Button
android:text="4"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button22" android:layout_weight="1"
/>
<Button
android:text="5"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button23" android:layout_weight="1"
/>
<Button
android:text="6"
android:layout_width="0dp"
android:layout_height="match_parent" android:id="@+id/button24" android:layout_weight="1"
/>
<Button
android:text="-"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button25" android:layout_weight="1"
/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent" android:layout_weight="1" android:id="@+id/OneToAsterix">
<Button
android:text="1"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button26" android:layout_weight="1"
/>
<Button
android:text="2"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button27" android:layout_weight="1"
/>
<Button
android:text="3"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button28" android:layout_weight="1"
/>
<Button
android:text="*"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button29" android:layout_weight="1"
/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent" android:layout_weight="1">
<Button
android:text="0"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button32" android:layout_weight="1"
/>
<Button
android:text="/"
android:layout_width="0dp"
android:onClick="onButtonClick"
android:layout_height="match_parent" android:id="@+id/button33" android:layout_weight="1"
/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_margin="10dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/resultButtonFragment" android:layout_weight="4" android:orientation="vertical"
>
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
そして、これは、両方のTextViewsを含む断片です。
package fr.android.calculator.Fragments;
import android.content.Context;
import android.os.Bundle;
import android.widget.TextView;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import fr.android.calculator.R;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link UpperCalculatorFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link UpperCalculatorFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class UpperCalculatorFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private TextView resultDisplay;
private TextView operations;
private OnFragmentInteractionListener mListener;
public UpperCalculatorFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment UpperCalculatorFragment.
*/
// TODO: Rename and change types and number of parameters
public static UpperCalculatorFragment newInstance(String param1, String param2) {
UpperCalculatorFragment fragment = new UpperCalculatorFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_upper_calculator, container, false);
operations = view.findViewById(R.id.operationsFragment);
resultDisplay = view.findViewById(R.id.resultDisplayFragment);
return view;
}
public void setOperationsText(String operationsText){
operations.setText(operationsText);
}
public void setResultDisplayText(String resultDisplayText){
resultDisplay.setText(resultDisplayText);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(String operations) {
if (mListener != null) {
mListener.operationsFragmentInteraction(operations);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void operationsFragmentInteraction(String operations);
void resultDisplayFragmentInteraction(String resultDisplay);
}
}
<?xml version="1.0" encoding="utf-8"?>
<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=".Fragments.UpperCalculatorFragment"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:background="@drawable/textview_border"
android:layout_marginRight="20dp"
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="@+id/operationsFragment" android:layout_weight="2"/>
<TextView
android:background="@drawable/textview_border"
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="@+id/resultDisplayFragment" android:layout_weight="3"/>
</LinearLayout>
</FrameLayout>
途中での活動自体は、このいずれかになります。
package fr.android.calculator.Activities;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import fr.android.calculator.Fragments.LowerCalculatorFragment;
import fr.android.calculator.Fragments.UpperCalculatorFragment;
import fr.android.calculator.R;
import org.mozilla.javascript.Context;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
public class CalculatorSecondActivity extends AppCompatActivity implements LowerCalculatorFragment.OnFragmentInteractionListener, UpperCalculatorFragment.OnFragmentInteractionListener {
private LowerCalculatorFragment lowerCalculatorFragment;
private UpperCalculatorFragment upperCalculatorFragment;
private Context rhino = Context.enter(); // runtime environment
private TextView operations;
private Button value;
private String result;
private TextView resultDisplay;
private Handler handler;
private DataInputStream dataInputStream;
private DataOutputStream dataOutputStream;
private String resp;
private Socket socket;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator_second);
lowerCalculatorFragment = LowerCalculatorFragment.newInstance("fragment", "you");
upperCalculatorFragment = UpperCalculatorFragment.newInstance("new fragment", "you 2");
getSupportFragmentManager().beginTransaction().add(R.id.lowerCalculator, lowerCalculatorFragment);
getSupportFragmentManager().beginTransaction().add(R.id.upperCalculator, upperCalculatorFragment);
getSupportFragmentManager().beginTransaction().commit();
}
@Override
public void operationsFragmentInteraction(String message) {
upperCalculatorFragment = (UpperCalculatorFragment) getSupportFragmentManager().findFragmentById(R.id.upperCalculator);
upperCalculatorFragment.setOperationsText(message);
}
@Override
public void resultDisplayFragmentInteraction(String message) {
upperCalculatorFragment = (UpperCalculatorFragment) getSupportFragmentManager().findFragmentById(R.id.upperCalculator);
upperCalculatorFragment.setResultDisplayText(message);
}
@Override
public void lowerFragmentInteraction(View view) {
value = view.findViewById(view.getId());
System.out.println("Value : " + value.getText());
if (value != view.findViewById(R.id.buttonEqualsFragment)) {
System.out.println("Value : " + value.getText());
operationsFragmentInteraction((String) value.getText());
} else {
// Avec Async
new AsyncTaskRunner().execute((String) operations.getText());
/* Avec Handler*/
//calculate((String) operations.getText());
}
}
public void onButtonClick(View view){
lowerCalculatorFragment.onButtonPressed(view);
}
public void calculate(String operations) {
Runnable runnable = () -> {
try {
socket = new Socket("10.0.2.2", 9876);
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream = new DataOutputStream(socket.getOutputStream());
dataOutputStream.writeUTF(operations);
result = dataInputStream.readUTF();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
handler.post(() -> resultDisplay.setText(result));
};
new Thread(runnable).start();
}
private class AsyncTaskRunner extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
try {
socket = new Socket("10.0.2.2", 9876);
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream = new DataOutputStream(socket.getOutputStream());
dataOutputStream.writeUTF(params[0]);
result = dataInputStream.readUTF();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
publishProgress(params[0]); // Calls onProgressUpdate()
resp = "Slept for " + 5 + " seconds";
return resp;
}
protected void onProgressUpdate(String... text) {
resultDisplayFragmentInteraction(result);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_calculator_second"
tools:context=".Activities.CalculatorSecondActivity">
<LinearLayout android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" android:weightSum="5">
<fragment android:layout_width="match_parent" android:layout_height="119dp"
android:name="fr.android.calculator.Fragments.UpperCalculatorFragment"
android:id="@+id/upperCalculator"
tools:layout="@layout/fragment_upper_calculator"
android:layout_weight="1"/>
<fragment android:name="fr.android.calculator.Fragments.LowerCalculatorFragment"
android:layout_width="409dp" android:layout_height="413dp"
android:id="@+id/lowerCalculator" tools:layout="@layout/fragment_lower_calculator"
android:layout_weight="4"/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
あなたたちは、なぜ任意のアイデアを持っていますか?
前もって感謝します、
運賃。
編集:私はエドガーからの賢明な助言の後に私のフラグメントにメソッドを追加しました。私が正しく理解している場合、インタフェースは、私たちはフラグメントの方法で使用される情報を、フェッチすることができます。しかし、私は私のボタンにClickListenersを追加したにも関わらず、唯一buttonEqualsFragment
に「耳を傾け」です。私はをクリックしない限り、デバッグする場合であってもbuttonEqualsFragment
他のボタン考慮されていません。
私は、フラグメントの実装インタフェースと呼ばれることを行うために活動してメソッドを作成しました。(onButtonClick
)
問題は、活動のないフラグメントで情報を表示しようとしているです。次の提案を試してみてください。
あなたにはUpperCalculatorFragment
、クラストップでこれを配置します。
private Textview operations, results;
その後、中onCreateView()
textviewsがnullでないことを確認するために以下を追加します。
operations = view.findViewById(R.id.operationsFragment);
results = view.findViewById(R.id.resultDisplayFragment);
次はあなたがこのフラグメントのアクティビティからの情報を処理します(UpperCalculatorFragment)まだパブリックメソッドを定義する必要があります。私はあなたが操作のためにも別のものを必要とする結果を示して
public void displayResult(String result){
results.setText(result);//this displays the result on textview
}
結果/操作を表示するには、あなたからそのメソッドを呼び出す必要がありCalculatorSecondActivity
そう等。
public void displayResultInFragment(String message) {
UpperCalculatorFragment upperFrag =
(UpperCalculatorFragment) getSupportFragmentManager()
.findFragmentById(R.id.upperCalculator);
//show the result here after all calculation
upperFrag.displayResult(message);
}
これを参照してくださいAndroidの開発者ドキュメント