如何解决Android 对话框窗口应用程序崩溃
我想使用 Dialog 类为测验应用程序制作一个预览弹出窗口。我创建了一个对话框并想要 将 setOnClickListener() 放在它的 button 上，它应该关闭对话框。但是当我添加 onClickListener 应用程序停止工作时，如果我评论 onClickListener() 函数它会起作用。如何为对话框窗口的按钮添加 onClickListener？
previewButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
nextQuestion();
}
对话框xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="410dp"
android:background="@color/black75"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="30"
android:textSize="28dp"
android:layout_gravity="center_horizontal"
android:textColor="@color/white"
android:layout_marginBottom="25dp"
android:text="Kirish"/>
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:textAlignment="center"
android:layout_weight="80"
android:textSize="20sp"
android:textColor="@color/white"
android:text="Islom dini haqidagi bilimingizni sinab ko'ring.Siz uchun tayyorlab qo'yilgan 10 ta savolni nechtasiga javob berishingizni tekshirib ko'ring"/>
</LinearLayout>
<Button
android:id="@+id/previewButton"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:textColor="@color/black"
android:text="Start"
android:layout_weight="100"
android:textSize="24sp"
android:background="@drawable/question_background"
android:padding="20dp"
android:layout_marginTop="100dp"
android:layout_marginBottom="50dp"
android:layout_gravity="center"
/>
</LinearLayout>
java代码：
package com.example.islomniorganamiz;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;
import android.annotation.SuppressLint;
import android.app.Dialog;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Random;
public class SavolJavob extends AppCompatActivity implements View.OnClickListener {
Random random=new Random();
int questionNumber=1;
TextView questionTextView,whichQuestion;
Button option1,option2,option3,option4;
Button previewButton;
Questions questions=new Questions();
ArrayList<Integer> askedQuestions = new ArrayList<Integer>();
Dialog dialog;
int random_button1;
int random_button2;
int random_button3;
int random_button4;
int random_number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_savol_javob);
questionTextView=findViewById(R.id.questionTextView);
whichQuestion=findViewById(R.id.whichQuestion);
option1=findViewById(R.id.option1);
option2=findViewById(R.id.option2);
option3=findViewById(R.id.option3);
option4=findViewById(R.id.option4);
previewButton=findViewById(R.id.previewButton);
option1.setOnClickListener(this);
option2.setOnClickListener(this);
option3.setOnClickListener(this);
option4.setOnClickListener(this);
dialog=new Dialog(this);
dialog.setContentView(R.layout.previewdialog);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.WHITE));
dialog.show();
previewButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
nextQuestion();
}
@Override
public void onClick(View v) {
String correctAnswer=questions.correctAnswersArray[random_number];
switch (v.getId()){
case R.id.option1:
if (option1.getText().equals(correctAnswer)){
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option1.setBackgroundResource(R.drawable.option_correct);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option1.setBackgroundResource(R.drawable.option_normal);
}
},800);
}
else{
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option1.setBackgroundResource(R.drawable.option_incorrect);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option1.setBackgroundResource(R.drawable.option_normal);
}
},800);
}
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
nextQuestion();
}
},1200);
break;
case R.id.option2:
if (option2.getText().equals(correctAnswer)){
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option2.setBackgroundResource(R.drawable.option_correct);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option2.setBackgroundResource(R.drawable.option_normal);
}
},800);
}else{
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option2.setBackgroundResource(R.drawable.option_incorrect);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option2.setBackgroundResource(R.drawable.option_normal);
}
},800);
}
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
nextQuestion();
}
},1200);
break;
case R.id.option3:
if (option3.getText().equals(correctAnswer)){
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option3.setBackgroundResource(R.drawable.option_correct);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option3.setBackgroundResource(R.drawable.option_normal);
}
},800);
}else{
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option3.setBackgroundResource(R.drawable.option_incorrect);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option3.setBackgroundResource(R.drawable.option_normal);
}
},800);
}
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
nextQuestion();
}
},1200);
break;
case R.id.option4:
if (option4.getText().equals(correctAnswer)){
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option4.setBackgroundResource(R.drawable.option_correct);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option4.setBackgroundResource(R.drawable.option_normal);
}
},800);
}else{
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option4.setBackgroundResource(R.drawable.option_incorrect);
}
},100);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
option4.setBackgroundResource(R.drawable.option_normal);
}
},1200);
break;
}
}
public void nextQuestion(){
random_number=random.nextInt(questions.questionsArray.length);
while ((askedQuestions.contains(random_number))){
random_number=random.nextInt(questions.questionsArray.length);
}
askedQuestions.add(random_number);
random_button1=random.nextInt(4);
while (random_button1==random_button2) {
random_button2 = random.nextInt(4);
}
while (random_button3==random_button1||random_button3==random_button2) {
random_button3 = random.nextInt(4);
}
while (random_button4==random_button1||random_button4==random_button2||random_button4==random_button3) {
random_button4 = random.nextInt(4);
}
whichQuestion.setText(questionNumber+" - SAVOL");
questionTextView.setText(questions.questionsArray[random_number]);
option1.setText(questions.optionsArray[random_number][random_button1]);
option2.setText(questions.optionsArray[random_number][random_button2]);
option3.setText(questions.optionsArray[random_number][random_button3]);
option4.setText(questions.optionsArray[random_number][random_button4]);
questionNumber++;
}
}
解决方法
请在您的代码中添加这一行
previewButton = dialog.findViewById(R.id.previewButton);
这里是完整的代码
dialog=new Dialog(this);
dialog.setContentView(R.layout.previewdialog);
//add previewButton in this place
previewButton = dialog.findViewById(R.id.previewButton);
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
