為什么當我嘗試運行這個程序時它會崩潰？

Question

我對 Java 有基本的了解，但對 Android Studio 是全新的。 我嘗試制作一個程序，當按下一個按鈕時它會增加一個計數器。 我基於我發現的兩段代碼（一段用於簡單的點擊計數器，一段用於使用 onClickListener）。 Studio 不會突出顯示代碼中的任何錯誤，但當我在模擬器上運行時程序崩潰了。

有人可以告訴我哪里出錯了嗎？

謝謝

這是 xml 代碼

```
<?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"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="96dp"
        android:onClick="onClick"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="UsingOnClickInXml" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.524"
        app:layout_constraintStart_toStartOf="parent"
        tools:layout_editor_absoluteY="314dp" />

</androidx.constraintlayout.widget.ConstraintLayout>
```


Here is the MainActivity code


```
package com.example.clickcounter;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    int numberOfClicks = 0;


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

    public void onClick (View view){
        TextView myText = findViewById(R.id.textView);

        findViewById(R.id.button).setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent mEvent) {
                if (mEvent.getAction() == MotionEvent.ACTION_DOWN)
                    numberOfClicks++;
                myText.setText(numberOfClicks);
                return false;
            }


        });


    }
}
```

我嘗試制作一個在按下按鈕時增加的計數器。 我從一個點擊計數器開始，它起作用了，但是當我修改代碼以在按住而不是單擊按鈕時增加計數器時遇到了問題。 該程序此后就崩潰了。

錯誤 output 是

D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.clickcounter, PID: 22459
    android.content.res.Resources$NotFoundException: String resource ID #0x1
        at android.content.res.Resources.getText(Resources.java:367)
        at android.widget.TextView.setText(TextView.java:6370)
        at com.example.clickcounter.MainActivity$1.onTouch(MainActivity.java:29)
        at android.view.View.dispatchTouchEvent(View.java:13411)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2698)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2698)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2698)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2698)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2698)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2698)
        at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:465)
        at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1849)
        at android.app.Activity.dispatchTouchEvent(Activity.java:3993)
        at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:70)
        at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:423)
        at android.view.View.dispatchPointerEvent(View.java:13674)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5482)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5285)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4788)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4841)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4807)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4947)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4815)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5004)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4788)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4841)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4807)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4815)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4788)
        at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7505)
        at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7474)
        at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7435)
        at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7630)
        at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:188)
        at android.os.MessageQueue.nativePollOnce(Native Method)
        at android.os.MessageQueue.next(MessageQueue.java:336)
        at android.os.Looper.loop(Looper.java:174)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
I/Process: Sending signal. PID: 22459 SIG: 9

Answer 1

看起來您使用 integer 而不是字符串來調用textView.setText 。

如果您調用textView.setText(1) ，您會收到該錯誤 - 您需要將 integer 轉換為字符串（例如使用String.valueOf或類似代碼）。

當您傳遞 integer 時，它會將其視為字符串資源標識符，並在找不到該資源時失敗並出現ResourceNotFound異常。