启动应用程序时发生致命错误（E/AndroidRuntime（464）：致命例外：main）

Question

嘿，伙计们我真的很陌生，应用程序和这是我开始我的应用程序时发生的错误。我真的很感激，如果你人能告诉我如何解决这个问题，一步一步的:)谢谢您，请登录：

08-04 17:02:45.480: D/AndroidRuntime(464): Shutting down VM 
    08-04 17:02:45.480: W/dalvikvm(464): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
    08-04 17:02:45.499: E/AndroidRuntime(464): FATAL EXCEPTION: main 
    08-04 17:02:45.499: E/AndroidRuntime(464): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dice.alt/com.dice.alt.DiceAlternativeActivity}: java.lang.ClassCastException: android.widget.TextView 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.os.Handler.dispatchMessage(Handler.java:99) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.os.Looper.loop(Looper.java:123) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.ActivityThread.main(ActivityThread.java:3683) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at java.lang.reflect.Method.invokeNative(Native Method) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at java.lang.reflect.Method.invoke(Method.java:507) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at dalvik.system.NativeStart.main(Native Method) 
    08-04 17:02:45.499: E/AndroidRuntime(464): Caused by: java.lang.ClassCastException: android.widget.TextView 
    08-04 17:02:45.499: E/AndroidRuntime(464): at com.dice.alt.DiceAlternativeActivity.onCreate(DiceAlternativeActivity.java:20) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
    08-04 17:02:45.499: E/AndroidRuntime(464): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
    08-04 17:02:45.499: E/AndroidRuntime(464): ... 11 more 
    08-04 17:02:48.179: I/Process(464): Sending signal. PID: 464 SIG: 9</i>' 

XML：

<?xml version="1.0" encoding="utf-8"?> 
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/android:list" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" > 

    <LinearLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="409dp" 
     android:orientation="vertical" > 

     <TextView 
      android:id="@+id/textView1" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:text="@string/ndice" 
      android:textAppearance="?android:attr/textAppearanceMedium" 
      android:textColor="#4876FF" /> 

     <EditText 
      android:id="@+id/editText1" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:ems="10" 
      android:inputType="number" 
      android:text="@string/empty" > 

      <requestFocus /> 
     </EditText> 

     <TextView 
      android:id="@+id/textView2" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:text="@string/udice" 
      android:textAppearance="?android:attr/textAppearanceMedium" 
      android:textColor="#4876FF" /> 

     <EditText 
      android:id="@+id/editText2" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:ems="10" 
      android:inputType="number" 
      android:text="@string/empty" /> 

     <Button 
      android:id="@+id/button1" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:text="@string/result" /> 

     <TextView 
      android:id="@+id/op" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textColor="#DC143C" 
      android:layout_weight="0.54" 
      android:text="@string/empty" 
      android:textAppearance="?android:attr/textAppearanceLarge" /> 

     <TextView 
      android:id="@+id/textView3" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:text="@string/ABJ2" 
      android:textAppearance="?android:attr/textAppearanceSmall" 
      android:textColor="#32CD32" /> 

    </LinearLayout> 
</ScrollView> 

Answer 1

Caused by: java.lang.ClassCastException: android.widget.TextView

-您的日志中的这条线表明在尝试将一种类型的变量转换为不兼容类型时存在异常。

-您可能是想投一些不兼容的TextView类型的变量，或者你正在铸造的TextView到不兼容的类型。

如：

Button b = (TextView)findViewById(R.id.mbut);