MediaPlayer和imagebutton的運行時錯誤

Question

我已經在這裏呆了兩天，但已經無處可去。希望有人能幫忙。

登錄貓：

07-09 09:39:03.226: D/dalvikvm(13110): GC_CONCURRENT freed 212K, 4% free 8260K/8519K, paused 24ms+7ms, total 106ms 
07-09 09:39:04.164: D/AndroidRuntime(13110): Shutting down VM 
07-09 09:39:04.164: W/dalvikvm(13110): threadid=1: thread exiting with uncaught exception (group=0x40f58300) 
07-09 09:39:04.207: E/AndroidRuntime(13110): FATAL EXCEPTION: main 
07-09 09:39:04.207: E/AndroidRuntime(13110): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vamp6x6x6x.dontpressbutton/com.vamp6x6x6x.dontpressbutton.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.os.Looper.loop(Looper.java:137) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.ActivityThread.main(ActivityThread.java:4745) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at java.lang.reflect.Method.invokeNative(Native Method) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at java.lang.reflect.Method.invoke(Method.java:511) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at dalvik.system.NativeStart.main(Native Method) 
07-09 09:39:04.207: E/AndroidRuntime(13110): Caused by: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button 
07-09 09:39:04.207: E/AndroidRuntime(13110): at com.vamp6x6x6x.dontpressbutton.MainActivity.onCreate(MainActivity.java:19) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.Activity.performCreate(Activity.java:5008) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
07-09 09:39:04.207: E/AndroidRuntime(13110): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
07-09 09:39:04.207: E/AndroidRuntime(13110): ... 11 more 
07-09 09:39:04.476: D/dalvikvm(13110): DexOpt: --- BEGIN 'ads90661078.jar' (bootstrap=0) --- 
07-09 09:39:05.207: D/dalvikvm(13110): DexOpt: --- END 'ads90661078.jar' (success) --- 
07-09 09:39:05.211: D/dalvikvm(13110): DEX prep '/data/data/com.vamp6x6x6x.dontpressbutton/cache/ads90661078.jar': unzip in 0ms, rewrite 731ms 

9月7日至9日：39：08.820：I /處理（13110）：發送信號。 PID：13110 SIG：9

佈局的xml：

<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" > 

    <ImageButton 
     android:id="@+id/imageButton1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerInParent="true" 
     android:background="@drawable/ic_launcher" 
     android:minHeight="230dp" 
     android:minWidth="230dp" /> 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/imageButton1" 
     android:layout_alignParentLeft="true" 
     android:layout_marginBottom="18dp" 
     android:text="Do not press the button" 
     android:textColor="#000000" 
     android:textSize="45px" 
     android:textStyle="bold" /> 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/imageButton1" 
     android:layout_centerHorizontal="true" 
     android:layout_marginBottom="18dp" 
     android:text="Text here" 
     android:textColor="#000000" 
     android:textSize="30sp" /> 



</RelativeLayout> 

清單：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.vamp6x6x6x.dontpressbutton" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="7" 
     android:targetSdkVersion="17" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 
    <uses-permission android:name="android.permission.INTERNET"/> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name=".MainActivity" 
      android:label="@string/app_name" 
      android:screenOrientation="portrait"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 

     </activity> 


    </application> 

</manifest> 

如果你需要我的Java我會提供，但我不知道，如果你需要它，因爲我我不擅長閱讀登錄貓。

Answer 1

正如我們在logcat的消息

Caused by: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button 

這意味着已分配給Button的Image Button參考看看。改變它，也就是做

ImageButton imgBtn= (ImageButton) findViewById(R.id.imageButton1);