如何解决为什么当我按下“提交”按钮时,我的应用程序仍然崩溃?我尝试了几种不同的方法,但没有任何效果
我试图让用户输入一个数字(进入EditText)并显示该数字(在TextView中)以备将来使用。我可以单击EditText,然后显示键盘,但不显示输入内容。然后,我单击提交按钮,应用程序崩溃。这是我的代码:
xml部分:
<?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:orientation="vertical"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent=".33" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent=".50" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent=".66" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="14dp" />
//Current resources------------------------------------------------------------
<TextView
android:id="@+id/ResourcesTitle"
android:layout_width="100dp"
android:layout_height="22dp"
android:text="RESOURCES"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="18sp"
app:layout_constraintEnd_toStartOf="@+id/ResourceSubmitButton"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/guideline4" />
<TextView
android:id="@+id/MetalIcon"
android:layout_width="40dp"
android:layout_height="20dp"
android:text="Metal"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
app:layout_constraintRight_toLeftOf="@id/MetalCounter"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<TextView
android:id="@+id/WoodIcon"
android:layout_width="40dp"
android:layout_height="20dp"
android:text="Wood"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
app:layout_constraintRight_toLeftOf="@id/guideline2"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<TextView
android:id="@+id/FoodIcon"
android:layout_width="40dp"
android:layout_height="20dp"
android:text="Food"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
app:layout_constraintLeft_toRightOf="@id/guideline3"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<EditText
android:id="@+id/MetalCounter"
android:layout_width="40dp"
android:layout_height="20dp"
android:layout_margin="4dp"
android:ems="10"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
android:inputType="number"
app:layout_constraintRight_toLeftOf="@id/guideline"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<EditText
android:id="@+id/WoodCounter"
android:layout_width="40dp"
android:layout_height="20dp"
android:layout_margin="4dp"
android:ems="10"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
android:inputType="number"
app:layout_constraintLeft_toRightOf="@id/guideline2"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<EditText
android:id="@+id/FoodCounter"
android:layout_width="40dp"
android:layout_height="20dp"
android:layout_margin="4dp"
android:ems="10"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
android:inputType="number"
app:layout_constraintLeft_toRightOf="@id/FoodIcon"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<TextView
android:id="@+id/MetalResult"
android:layout_width="40dp"
android:layout_height="20dp"
android:layout_margin="4dp"
android:text=""
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
app:layout_constraintRight_toLeftOf="@id/guideline"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<TextView
android:id="@+id/WoodResult"
android:layout_width="40dp"
android:layout_height="20dp"
android:layout_margin="4dp"
android:text=""
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
app:layout_constraintLeft_toRightOf="@id/guideline2"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<TextView
android:id="@+id/FoodResult"
android:layout_width="40dp"
android:layout_height="20dp"
android:layout_margin="4dp"
android:text=""
android:textAlignment="center"
android:textColor="#000000"
android:textSize="15sp"
app:layout_constraintLeft_toRightOf="@id/FoodIcon"
app:layout_constraintTop_toBottomOf="@id/ResourceSubmitButton" />
<Button
android:id="@+id/ResourceSubmitButton"
android:layout_width="68dp"
android:layout_height="35dp"
android:text="Submit"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="12sp"
app:layout_constraintLeft_toRightOf="@id/guideline"
app:layout_constraintRight_toLeftOf="@id/guideline3"
app:layout_constraintTop_toBottomOf="@id/guideline4" />
<View
android:id="@+id/SeparatorLine"
android:layout_width="fill_parent"
android:layout_height="3dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:background="#000000"
app:layout_constraintLeft_toRightOf="parent"
app:layout_constraintRight_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/MetalIcon" />
</androidx.constraintlayout.widget.ConstraintLayout>
和Java部分:
package com.example.game;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
// These are the global variables
EditText MetalCounter,WoodCounter,FoodCounter;
TextView MetalResult,WoodResult,FoodResult;
Button ResourceSubmitButton;
int Metal,Wood,Food;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//to get from user input and into variable form
MetalCounter = (EditText) findViewById(R.id.MetalCounter);
WoodCounter = (EditText) findViewById(R.id.WoodCounter);
FoodCounter = (EditText) findViewById(R.id.FoodCounter);
MetalResult = (TextView) findViewById(R.id.MetalResult);
WoodResult = (TextView) findViewById(R.id.WoodResult);
FoodResult = (TextView) findViewById(R.id.FoodResult);
ResourceSubmitButton = (Button) findViewById(R.id.ResourceSubmitButton);
//Submit button
ResourceSubmitButton.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//to receive the inputted values
Metal = Integer.parseInt(MetalCounter.getText().toString());
Wood = Integer.parseInt(WoodCounter.getText().toString());
Food = Integer.parseInt(FoodCounter.getText().toString());
//to show the inputted values into the result fields
MetalResult.setText(Metal);
WoodResult.setText(Wood);
FoodResult.setText(Food);
}
});
}
}
解决方法
您的全局变量
int Metal,Wood,Food;
您的setText
MetalResult.setText(Metal);
WoodResult.setText(Wood);
FoodResult.setText(Food);
setText需要TEXT(字符串)而不是其他类型
MetalResult.setText("" + Metal);
WoodResult.setText("" + Wood);
FoodResult.setText("" + Food);
由于您使用的是R.id的整数参数,并且在R.id中找不到该整数,从而导致内存访问错误,因此只需将INT转换为setText上的String,就会导致错误
,您可以按如下所示更改按钮的点击
//Submit button
ResourceSubmitButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
MetalResult.setText(MetalCounter.getText().toString());
WoodResult.setText(WoodCounter.getText().toString());
FoodResult.setText(FoodCounter.getText().toString());
}
});
当您尝试使用TextView.setText函数时,int值及其字符串资源都有一个重载,因此您应该使用TextView.setText(String value)函数。
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