使用多个OnClickListeners我得到致命异常

主要的事情发生在致命的执行我的应用程序不启动，并出现错误不幸停止它不断崩溃尝试开关的情况下，如果仍然错误继续应用程序不断崩溃谷歌搜索和搜索over stackflow不同用户stackovered面临这个错误仍然错误仍然继续与我，即使尝试他们的解决方案与单个如果和单个onclicklistener应用程序管理运行，但不与多个onlicklistener是有不同的方式来运行多个onclick监听器应用程序，请帮助我使用多个OnClickListeners我得到致命异常

Here's MainActivity.java

package com.example.cricscore; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

// Private member field to keep track of the count 
private int mCount = 0; 
private static final String TAG = "MainActivity"; 


/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 


    Button buttonA = (Button) findViewById(R.id.button1);  
    buttonA.setOnClickListener((OnClickListener) this); 
    Button buttonB = (Button) findViewById(R.id.button2); 
    buttonB.setOnClickListener((OnClickListener) this); 
} 

    public void onClick(View v) { 
     try { 
     switch (v.getId()) { 
      case R.id.button1: 
       mCount++; 
       final TextView countTextView = (TextView) findViewById(R.id.textView1); 
       countTextView.setText(""+ mCount); 
      break; 
      case R.id.button2: 
       mCount= mCount+2 ; 
       final TextView countTextView1 = (TextView) findViewById(R.id.textView1); 
       countTextView1.setText(""+ mCount); 
      break; 


     } 
     } 
     catch(Throwable t) { 
      Log.e(TAG, t.getMessage(), t); 

     } 

    } 
}

而且activity_main.xml中是

<RelativeLayout 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" 
tools:context=".MainActivity" > 

<TextView 
    android:id="@+id/textView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<TextView 
    android:id="@+id/textView3" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignRight="@+id/button2" 
    android:layout_below="@+id/textView1" 
    android:text="Runs" /> 

<TextView 
    android:id="@+id/textView4" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/textView3" 
    android:layout_alignBottom="@+id/textView3" 
    android:layout_alignRight="@+id/textView2" 
    android:layout_marginRight="19dp" 
    android:text="Wickets" /> 

<TextView 
    android:id="@+id/textView2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/textView4" 
    android:layout_alignParentRight="true" 
    android:text="Large Text" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<Button 
    android:id="@+id/button1" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/textView3" 
    android:text="1" /> 

<Button 
    android:id="@+id/button2" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/button1" 
    android:layout_alignBottom="@+id/button1" 
    android:layout_toRightOf="@+id/button1" 
    android:text="2" /> 

<Button 
    android:id="@+id/button4" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/button1" 
    android:text="6" /> 

<Button 
    android:id="@+id/button6" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/button5" 
    android:layout_alignRight="@+id/textView4" 
    android:text="Wicket" /> 

<Button 
    android:id="@+id/button7" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/button8" 
    android:layout_alignBottom="@+id/button8" 
    android:layout_alignLeft="@+id/button5" 
    android:text="Balls" /> 

<Button 
    android:id="@+id/button3" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/textView3" 
    android:layout_toRightOf="@+id/button7" 
    android:text="4" /> 

<Button 
    android:id="@+id/button8" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_marginBottom="44dp" 
    android:layout_toLeftOf="@+id/textView2" 
    android:text="Button" /> 

<Button 
    android:id="@+id/button5" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/button4" 
    android:layout_alignBottom="@+id/button4" 
    android:layout_toLeftOf="@+id/textView7" 
    android:text="No/Wide" /> 

<TextView 
    android:id="@+id/textView6" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/textView7" 
    android:layout_alignBottom="@+id/textView7" 
    android:layout_alignRight="@+id/button5" 
    android:text="Large Text" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<TextView 
    android:id="@+id/textView7" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/button8" 
    android:layout_toLeftOf="@+id/textView4" 
    android:text="Large Text" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 

</RelativeLayout>

logcat的

03-18 14:09:37.717: E/AndroidRuntime(360): FATAL EXCEPTION: main 
03-18 14:09:37.717: E/AndroidRuntime(360): java.lang.RuntimeException: Unable to start  
    activity 
    ComponentInfo{com.example.abc/com.example.abc.MainActivity}: java.lang.ClassCastException:  
    com.example.abc.MainActivity 
    03-18 14:09:37.717: E/AndroidRuntime(360): at  
    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at 
    android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:1663) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at android.app.ActivityThread.access$1500 
    (ActivityThread.java:117) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at android.app.ActivityThread$H.handleMessage 
    (ActivityThread.java:931) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at android.os.Handler.dispatchMessage 
    (Handler.java:99) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at android.os.Looper.loop(Looper.java:123) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at android.app.ActivityThread.main 
    (ActivityThread.java:3683) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at java.lang.reflect.Method.invokeNative(Native 
    Method) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at java.lang.reflect.Method.invoke 
    (Method.java:507) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at 
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at com.android.internal.os.ZygoteInit.main 
    (ZygoteInit.java:597) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at dalvik.system.NativeStart.main(Native Method) 
    03-18 14:09:37.717: E/AndroidRuntime(360): Caused by: java.lang.ClassCastException: 
    com.example.abc.MainActivity 
    03-18 14:09:37.717: E/AndroidRuntime(360): at com.example.abc.MainActivity.onCreate 
    (MainActivity.java:30) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at 
    android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
    03-18 14:09:37.717: E/AndroidRuntime(360): at 
    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
    03-18 14:09:37.717: E/AndroidRuntime(360): ... 11 more

一些修改，至于说通过第1回答我的代码没有崩溃，但我只能看到空白的活动，其中后android_mainfest仍然是相同的

package com.example.cricscore; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 

public class MainActivity extends Activity implements OnClickListener { 

// Private member field to keep track of the count 
private int mCount = 0; 
/** Called when the activity is first created. 
* @param OnClickListener */ 
public void onCreate(Bundle savedInstanceState, android.view.View.OnClickListener 
OnClickListener){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 


    Button buttonA = (Button) findViewById(R.id.button1);  
    buttonA.setOnClickListener((OnClickListener)); 
    Button buttonB = (Button) findViewById(R.id.button2); 
    buttonB.setOnClickListener((OnClickListener)); 
} 

    public void OnClickListener(View v) { 

     switch (v.getId()) { 
      case R.id.button1: 
       mCount++; 
       final TextView countTextView = (TextView) findViewById(R.id.textView1); 
       countTextView.setText(""+ mCount); 
      break; 
      case R.id.button2: 
       mCount= mCount+2 ; 
       final TextView countTextView1 = (TextView) findViewById(R.id.textView1); 
       countTextView1.setText(""+ mCount); 
      break; 


     } 


    } 

@Override 
public void onClick(View v) { 
    // TODO Auto-generated method stub 

} 
}

来源

2013-03-18 Rupesh Prabhu

嗨，欢迎来到Stack Overflow。如果您能够将问题切入问题的根源，那么获得帮助就容易多了。避免粘贴大量代码，因为这只会让人们难以发现问题。 – SWeko 2013-03-18 12:44:52

的

方法setOnClickListener预计类型的参数。你在做什么，走的是Activity本身，并试图将其转换为一个OnClickListener它不是，在这一段代码：

Button buttonA = (Button) findViewById(R.id.button1);  
buttonA.setOnClickListener((OnClickListener) this); // <-- here 
Button buttonB = (Button) findViewById(R.id.button2); 
buttonB.setOnClickListener((OnClickListener) this); // <-- and here too

你应该声明你的活动是一个OnClickListener，使用：

public class MainActivity extends Activity implements OnClickListener

由于您已有onClick(View v)方法，因此应该修复问题。

来源

2013-03-18 12:40:47 SWeko

即使添加后公共类MainActivity扩展活动实现OnClickListener 仍然我收到Java致命错误应用程序崩溃 – 2013-03-18 18:17:52

使用多个OnClickListeners我得到致命异常

回答

相关问题