java - 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。addListenerOnButton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，但如果我在第二个活动中注释掉代码，应用程序就可以正常工作。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（没有评论 setOnClickListener 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);
}
});
*/
}
}
和 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
解决方案
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