Android應用程序崩潰按鈕單擊

Question

我做了一個簡單的應用程序，它需要兩個數字並添加它們，但按鈕上點擊我的應用程序每次崩潰。我是新來的機器人，編號真的很感激，如果有人可以幫助我這個

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 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: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.example.ornadmin.myapplication.MainActivity"> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="number" 
     android:ems="10" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginStart="21dp" 
     android:layout_marginTop="29dp" 
     android:id="@+id/editText" 
     android:hint="number 1" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="number" 
     android:ems="10" 
     android:layout_below="@+id/editText" 
     android:layout_alignEnd="@+id/editText" 
     android:layout_marginTop="32dp" 
     android:id="@+id/editText2" 
     android:hint="number 2" /> 

    <TextView 
     android:text="Result" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginStart="13dp" 
     android:id="@+id/textView" 
     android:layout_below="@+id/editText2" 
     android:layout_alignStart="@+id/editText2" 
     android:layout_marginTop="57dp" 
     android:textSize="30sp" /> 

    <Button 
     android:text="sum" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/button" 
     android:onClick="onButtonClick (MainActivity)" 
     android:layout_alignTop="@+id/textView" 
     android:layout_alignStart="@+id/textView" 
     android:layout_marginTop="97dp" /> 
</RelativeLayout> 

主要活動

package com.example.ornadmin.myapplication; 

import android.app.Activity; 
import android.app.IntentService; 
import android.net.Uri; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView; 

import com.google.android.gms.appindexing.Action; 
import com.google.android.gms.appindexing.AppIndex; 
import com.google.android.gms.appindexing.Thing; 
import com.google.android.gms.common.api.GoogleApiClient; 

public class MainActivity extends Activity { 

    /** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
    private GoogleApiClient client; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 
    } 

    public void onButtonClick(View v) { 
     EditText e1 = (EditText)findViewById(R.id.editText); 
     EditText e2 = (EditText)findViewById(R.id.editText2); 
     TextView t1 = (TextView)findViewById(R.id.textView); 
     int num1 = Integer.parseInt(e1.getText().toString()); 
     int num2 = Integer.parseInt(e2.getText().toString()); 
     int sum = num1 + num2; 
    } 

    /** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
    public Action getIndexApiAction() { 
     Thing object = new Thing.Builder() 
       .setName("Main Page") // TODO: Define a title for the content shown. 
       // TODO: Make sure this auto-generated URL is correct. 
       .setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]")) 
       .build(); 
     return new Action.Builder(Action.TYPE_VIEW) 
       .setObject(object) 
       .setActionStatus(Action.STATUS_TYPE_COMPLETED) 
       .build(); 
    } 

    @Override 
    public void onStart() { 
     super.onStart(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client.connect(); 
     AppIndex.AppIndexApi.start(client, getIndexApiAction()); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     AppIndex.AppIndexApi.end(client, getIndexApiAction()); 
     client.disconnect(); 
    } 
} 

LOG

--------- beginning of crash 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.ornadmin.myapplication, PID: 3812 
        java.lang.IllegalStateException: Could not find method onButtonClick (MainActivity)(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.widget.Button with id 'button' 
         at android.view.View$DeclaredOnClickListener.resolveMethod(View.java:4479) 
         at android.view.View$DeclaredOnClickListener.onClick(View.java:4443) 
         at android.view.View.performClick(View.java:5198) 
         at android.view.View$PerformClick.run(View.java:21147) 
         at android.os.Handler.handleCallback(Handler.java:739) 
         at android.os.Handler.dispatchMessage(Handler.java:95) 
         at android.os.Looper.loop(Looper.java:148) 
         at android.app.ActivityThread.main(ActivityThread.java:5417) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Application terminated. 

Answer 1

的問題是在這條線

android:onClick="onButtonClick (MainActivity)" 

修正會是這樣

android:onClick="onButtonClick"