通过将主题更改回Theme.AppCompat.Light来减少错误。但是，仍然存在许多错误。我不知道Android studio中的基本代码有什么问题。它在几秒钟之前工作得很好。
09-09 20:51:06.605 6986-6986/com.example.justjava E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.justjava, PID: 6986
Theme: themes:{default=overlay:com.resurrectionremix.pitchblack, fontPkg:com.resurrectionremix.pitchblack, com.android.systemui=overlay:com.resurrectionremix.pitchblack, com.android.systemui.navbar=overlay:com.resurrectionremix.pitchblack}
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
at android.content.res.Resources.getText(Resources.java:336)
at android.support.v7.widget.ResourcesWrapper.getText(ResourcesWrapper.java:52)
at android.widget.TextView.setText(TextView.java:4422)
at com.example.justjava.MainActivity.display(MainActivity.java:25)
at com.example.justjava.MainActivity.submitOrder(MainActivity.java:19)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:padding="16dp"
android:orientation="vertical"
tools:context="com.example.justjava.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/quantity"
android:textAllCaps="true"
android:textSize="16sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:textSize="16sp"
android:textColor="@android:color/black"
android:id="@+id/quantityView"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="@string/price"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="$0"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:textColor="@android:color/black"
android:id="@+id/priceView"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/order"
android:textSize="16sp"
android:onClick="submitOrder"/>
</LinearLayout>
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
</resources>
MainActivity.java
package com.example.justjava;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void submitOrder(View view){
int numOfCoffees = 1;
display(numOfCoffees);
displayPrice(numOfCoffees*5);
}
private void display(int num){
TextView tv1 = (TextView) findViewById(R.id.quantityView);
tv1.setText(num);
}
private void displayPrice(int num){
TextView tv2 = (TextView)findViewById(R.id.priceView);
tv2.setText(num);
}
}
答案 0 :(得分：0)
在Textview中，你不能只使用整数setText（），你必须先将它转换为字符串。
试
tv1.setText(Integer.toString(num));
答案 1 :(得分：0)
由于TextView不接受将Integer设置为setText，因此需要转换为字符串或附加到空字符串。
tv.setText（ “” + NUM）;
OR
tv.setText（将String.valueOf（NUM））;
答案 2 :(得分：0)
方法public void submitOrder（View v）是否在您正在为该布局充气的活动中定义？