Question

我是Android工作室的新手，我正在创建一个应用程序，但我无法让它正常运行。

目的是当我按下按钮顺序时，其中一个textView显示在文本＆＃34; 5＆＃34;中，默认为0。

这是activitymain.xml

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.amc.alvaro.justjava.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Quantity"
        android:textAllCaps="true"
        android:layout_marginBottom="16dp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0"
        android:textSize="16sp"
        android:id="@+id/quantity_text_view"
        android:textColor="@android:color/black"
        android:layout_marginBottom="16dp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Price"
        android:textAllCaps="true"
        android:layout_marginBottom="16dp"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0"
        android:layout_marginBottom="16dp"
        android:textColor="@android:color/black"
        android:id="@+id/price_text_view"/>

    <Button
        android:text="ORDER"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:layout_marginTop="16dp"
        android:onClick="submitOrder"/>
</LinearLayout>

这是MainActivity.java

package com.amc.alvaro.justjava;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends AppCompatActivity {

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

    /**
     * This method is called when the order button is clicked.
     */
    public void submitOrder(View view) {
        int quantity = 5;
        display(quantity);
    }

    /**
     * This method displays the given quantity value on the screen.
     */
    private void display(int number) {
        TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
        quantityTextView.setText(number);
    }
    /**
     * This method displays the given price on the screen.
     */

}

这是logcat

02/04 13:29:36: Launching app
$ adb shell am start -n "com.amc.alvaro.justjava/com.amc.alvaro.justjava.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Connected to process 4458 on device Nexus_5_API_24 [emulator-5554]
I/InstantRun: Instant Run Runtime started. Android package is com.amc.alvaro.justjava, real application class is null.
W/System: ClassLoader referenced unknown path: /data/app/com.amc.alvaro.justjava-1/lib/x86
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
E/EGL_emulation: tid 4510: eglSurfaceAttrib(1146): error 0x3009 (EGL_BAD_MATCH)
W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xab3b93a0, error=EGL_BAD_MATCH
W/ResourceType: No package identifier when getting value for resource number 0x00000005
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.amc.alvaro.justjava, PID: 4458
                  java.lang.IllegalStateException: Could not execute method for android:onClick
                      at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
                      at android.view.View.performClick(View.java:5610)
                      at android.view.View$PerformClick.run(View.java:22265)
                      at android.os.Handler.handleCallback(Handler.java:751)
                      at android.os.Handler.dispatchMessage(Handler.java:95)
                      at android.os.Looper.loop(Looper.java:154)
                      at android.app.ActivityThread.main(ActivityThread.java:6077)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
                   Caused by: java.lang.reflect.InvocationTargetException
                      at java.lang.reflect.Method.invoke(Native Method)
                      at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
                      at android.view.View.performClick(View.java:5610) 
                      at android.view.View$PerformClick.run(View.java:22265) 
                      at android.os.Handler.handleCallback(Handler.java:751) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:154) 
                      at android.app.ActivityThread.main(ActivityThread.java:6077) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
                   Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x5
                      at android.content.res.Resources.getText(Resources.java:331)
                      at android.widget.TextView.setText(TextView.java:4554)
                      at com.amc.alvaro.justjava.MainActivity.display(MainActivity.java:33)
                      at com.amc.alvaro.justjava.MainActivity.submitOrder(MainActivity.java:23)
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
                      at android.view.View.performClick(View.java:5610) 
                      at android.view.View$PerformClick.run(View.java:22265) 
                      at android.os.Handler.handleCallback(Handler.java:751) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:154) 
                      at android.app.ActivityThread.main(ActivityThread.java:6077) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
Application terminated.

Answer 1

您需要调用textView.setText（Integer.toString（number））。传入一个整数使得它查找具有该id的字符串资源，这不太可能存在（如果它是一些随机字符串）。

另外：它总是最底层的异常是真正的问题“引起：android.content.res.Resources $ NotFoundException：String resource ID＃0x5”

Answer 2

它崩溃是因为你将int传递给.setText()而不是String，而android的行为就像你传递了它无法找到的字符串资源的id。

将其更改为quantityTextView.setText(String.format(Locale.getDefault(), "%d", number));

Android Studio问题; java.lang.IllegalStateException：无法执行android：onClick的方法

2 个答案: