setOnClickListener 使应用程序崩溃 - Android

问题描述

我的应用中有 3 个活动。我在所有 3 个活动中的所有图像按钮上设置了 setonClickListener。当我运行应用程序并单击第一个活动中的第一个按钮时，应用程序崩溃，但如果我注释掉第二个活动中的 addListenerOnButton 代码，应用程序运行正常。任何帮助表示赞赏

这是MainActivity.java的代码

package com.example.caa;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageButton;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    ImageButton maschio,femmina;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        addListenerOnButton();
    }

    public void addListenerOnButton() {

        maschio = (ImageButton) findViewById(R.id.Uomo);
        femmina = (ImageButton) findViewById(R.id.Donna);

        maschio.setonClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v){
                Intent i = new Intent(MainActivity.this,Scelta_Simbolo.class);
                String genere = "maschio";
                i.putExtra("genere",genere);
                startActivity(i);

                /*SERVE PER VEDERE DIRETTAMENTE SU SCHERMO UN MESSAGGIO
                    Toast.makeText(MainActivity.this,"ImageButton is clicked!",Toast.LENGTH_SHORT).show();*/
            }
        });

        femmina.setonClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v){
                Intent i = new Intent(MainActivity.this,Scelta_Simbolo.class);
                String genere = "femmina";
                i.putExtra("genere",genere);
                startActivity(i);

            }
        });

    }
}

和activity_main.xml

<?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"
    android:background="@drawable/sfondo"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Pagina 1 - TEST"
        android:textAlignment="center"
        android:textColor="#FFFFFF"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.057" />

    <ImageButton
        android:id="@+id/Donna"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#00FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.826"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.661"
        app:srcCompat="@drawable/woman" />

    <ImageButton
        android:id="@+id/Uomo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#00FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.793"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.238"
        app:srcCompat="@drawable/man" />

    <TextView
        android:id="@+id/Voce_Uomo"
        android:layout_width="157dp"
        android:layout_height="35dp"
        android:text="Voce Maschile "
        android:textAlignment="center"
        android:textColor="#FFFFFF"
        android:textSize="24sp"
        android:textStyle="bold|italic"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.208"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.28" />

    <TextView
        android:id="@+id/Voce_Donna"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Voce Femminile"
        android:textAlignment="center"
        android:textColor="#FFFFFF"
        android:textSize="24sp"
        android:textStyle="bold|italic"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.218"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.629" />

</androidx.constraintlayout.widget.ConstraintLayout>

这是第二类代码：Scelta_Simbolo.java（对 setonClickListener 没有评论，所以在这种情况下崩溃）

package com.example.caa;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

public class Scelta_Simbolo extends MainActivity {

    ImageButton si_no,su_giu,ok_nope;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scelta_simbolo);

        addListenerOnButton();
    }

    public void addListenerOnButton() {

        si_no = (ImageButton) findViewById(R.id.si_no_button);
       // su_giu = (ImageButton) findViewById(R.id.su_giu_button);
      //  ok_nope = (ImageButton) findViewById(R.id.ok_nope_button);

        Bundle receiveBundle = this.getIntent().getExtras();
        final String receiveValue = receiveBundle.getString("genere");

        si_no.setonClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v){
              /*  Intent i = new Intent(Scelta_Simbolo.this,Ripr_Audio.class);
                String scelta = "si_no";
                i.putExtra("scelta",receiveValue);
                startActivity(i);*/

            }
        });

/*        su_giu.setonClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v){
                Intent i = new Intent(Scelta_Simbolo.this,Ripr_Audio.class);
                String scelta = "su_giu";
                i.putExtra("scelta",scelta);
                startActivity(i);

            }
        });

        ok_nope.setonClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v){
                Intent i = new Intent(Scelta_Simbolo.this,Ripr_Audio.class);
                String scelta = "ok_nope";
                i.putExtra("scelta",scelta);
                startActivity(i);

            }
        });
*/
    }
}

还有 xml activity_scelta_simbolo.xml

<?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"
    android:background="@drawable/sfondo">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Pagina 2 - TEST"
        android:textAlignment="center"
        android:textColor="#FFFFFF"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="@+id/textView3"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.057" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Scegli quale tipologia di simboli vuoi utlizzare:"
        android:textAlignment="center"
        android:textColor="#FFFFFF"
        android:textSize="25sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.149" />

    <ImageButton
        android:id="@+id/si_no_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#00FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/textView2"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.336"
        app:srcCompat="@drawable/si_no" />

    <ImageButton
        android:id="@+id/su_giu_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#00FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/si_no_button"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="@+id/si_no_button"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.531"
        app:srcCompat="@drawable/su_giu" />

    <ImageButton
        android:id="@+id/ok_nope_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#00FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/su_giu_button"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="@+id/su_giu_button"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.728"
        app:srcCompat="@drawable/ok_nope" />

</androidx.constraintlayout.widget.ConstraintLayout>

谢谢

解决方法

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