Question

VitaminTable.java：

package vitaminTable.xyz.com;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;


public class VitaminTable extends Activity {
Button vitaminA,vitaminB1,vitaminB2,vitaminB3,vitaminB5,vitaminB6,vitaminB7,vitaminB9;
Button vitaminB12,vitaminC,vitaminD,vitaminE,vitaminK;

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

    vitaminA = (Button) findViewById(R.id.vitaminA);
    vitaminB1 = (Button) findViewById(R.id.vitaminB1);
    vitaminB2 = (Button) findViewById(R.id.vitaminB2);
    vitaminB3 = (Button) findViewById(R.id.vitaminB3);
    vitaminB5 = (Button) findViewById(R.id.vitaminB5);
    vitaminB6 = (Button) findViewById(R.id.vitaminB6);
    vitaminB7 = (Button) findViewById(R.id.vitaminB7);
    vitaminB9 = (Button) findViewById(R.id.vitaminB9);
    vitaminB12 = (Button) findViewById(R.id.vitaminB12);
    vitaminC = (Button) findViewById(R.id.vitaminC);
    vitaminD = (Button) findViewById(R.id.vitaminD);
    vitaminE = (Button) findViewById(R.id.vitaminE);
    vitaminK = (Button) findViewById(R.id.vitaminK);

    vitaminA.setOnClickListener((OnClickListener) this);
    vitaminB1.setOnClickListener((OnClickListener) this);
    vitaminB2.setOnClickListener((OnClickListener) this);
    vitaminB3.setOnClickListener((OnClickListener) this);
    vitaminB5.setOnClickListener((OnClickListener) this);
    vitaminB6.setOnClickListener((OnClickListener) this);
    vitaminB7.setOnClickListener((OnClickListener) this);
    vitaminB9.setOnClickListener((OnClickListener) this);
    vitaminB12.setOnClickListener((OnClickListener) this);
    vitaminC.setOnClickListener((OnClickListener) this);
    vitaminD.setOnClickListener((OnClickListener) this);
    vitaminE.setOnClickListener((OnClickListener) this);
    vitaminK.setOnClickListener((OnClickListener) this);
}


public void onClick(View v) {
    switch (v.getId()) {

    case R.id.vitaminA:
     Intent va = new Intent(VitaminTable.this,vita.class);
     startActivity(va);
    break;

   case R.id.vitaminB1:
      Intent vb1 = new Intent(VitaminTable.this,vitb1.class);
      startActivity(vb1);
    break;

   case R.id.vitaminB2:
      Intent vb2 = new Intent(VitaminTable.this,vitb2.class);
       startActivity(vb2);
     break;

   case R.id.vitaminB3:
      Intent vb3 = new Intent(VitaminTable.this,vitb3.class);
       startActivity(vb3);
     break;

   case R.id.vitaminB5:
      Intent vb5 = new Intent(VitaminTable.this,vitb5.class);
        startActivity(vb5);
      break;

   case R.id.vitaminB6:
      Intent vb6 = new Intent(VitaminTable.this,vitb6.class);
        startActivity(vb6);
      break;

   case R.id.vitaminB7:
      Intent vb7 = new Intent(VitaminTable.this,vitb7.class);
        startActivity(vb7);
      break;

   case R.id.vitaminB9:
      Intent vb9 = new Intent(VitaminTable.this,vitb9.class);
        startActivity(vb9);
      break;

   case R.id.vitaminB12:
      Intent vb12 = new Intent(VitaminTable.this,vitb12.class);
        startActivity(vb12);
      break;

   case R.id.vitaminC:
      Intent vc = new Intent(VitaminTable.this,vitc.class);
        startActivity(vc);
      break;

   case R.id.vitaminD:
      Intent vd = new Intent(VitaminTable.this,vitd.class);
        startActivity(vd);
      break;

   case R.id.vitaminE:
      Intent ve = new Intent(VitaminTable.this,vite.class);
        startActivity(ve);
      break;

   case R.id.vitaminK:
      Intent vk = new Intent(VitaminTable.this,vitk.class);
        startActivity(vk);
      break;   
  }
 }
}

清单文件：

<?xml version="1.0" encoding="utf-8"?>
     <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="vitaminTable.xyz.com"
    android:versionCode="1"
      android:versionName="1.0">
     <application android:icon="@drawable/icon" android:label="@string/app_name">
       <activity android:name=".VitaminTable"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
   <activity android:name=".vita"/>
    <activity android:name=".vitb1" />
    <activity android:name=".vitb2" />
    <activity android:name=".vitb3" />
    <activity android:name=".vitb5" />
    <activity android:name=".vitb6" />
    <activity android:name=".vitb7" />
    <activity android:name=".vitb9" />
    <activity android:name=".vitb12" />
    <activity android:name=".vitc" />
    <activity android:name=".vitd" />
    <activity android:name=".vite" />
    <activity android:name=".vitk" />
    <activity android:name=".vitadailyreq" />

   </application>


</manifest>

main.xml中：

 <?xml version="1.0" encoding="utf-8"?>


  <ScrollView
 android:id="@+id/Vitamintable"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 xmlns:android="http://schemas.android.com/apk/res/android"  
 >

 <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:stretchColumns="1"
 android:background="@drawable/fruit2">

  <TableRow>
 <Button   
 android:id="@+id/vitaminA"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin A"
  android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
  <Button   
 android:id="@+id/vitaminB1"
 android:layout_width="240px"
  android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
  android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin B1"
 android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminB2"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
  android:textColor="#D15FEE"
 android:textStyle="bold"
  android:gravity="left"
  android:text="Vitamin B2"
  android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
  <Button   
 android:id="@+id/vitaminB3"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
  android:background="#FFFFFF"
  android:textColor="#D15FEE"
  android:textStyle="bold"
  android:gravity="left"
 android:text="Vitamin B3"
 android:fadingEdge="horizontal|vertical"/>

  </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminB5"
 android:layout_width="240px"
 android:layout_height="36px"
  android:textSize="15sp"
  android:background="#FFFFFF"
   android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin B5"
 android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminB6"
  android:layout_width="240px"
 android:layout_height="36px"
  android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin B6"
  android:fadingEdge="horizontal|vertical"/>

 </TableRow>
     <TableRow>
 <Button   
 android:id="@+id/vitaminB7"
 android:layout_width="240px"
 android:layout_height="36px"
  android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin B7" 
 android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
 <Button   
android:id="@+id/vitaminB9"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
  android:text="Vitamin B9"
  android:fadingEdge="horizontal|vertical"/>

  </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminB12"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin B12"
 android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminC"
 android:layout_width="240px"
 android:layout_height="36px"
  android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin C"
  android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminD"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin D"
  android:fadingEdge="horizontal|vertical"/>

  </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminE"
 android:layout_width="240px"
 android:layout_height="36px"
 android:textSize="15sp"
 android:background="#FFFFFF"
 android:textColor="#D15FEE"
 android:textStyle="bold"
 android:gravity="left"
 android:text="Vitamin E"
 android:fadingEdge="horizontal|vertical"/>

 </TableRow>
    <TableRow>
 <Button   
 android:id="@+id/vitaminK"
  android:layout_width="240px"
   android:layout_height="36px"
   android:textSize="15sp"
  android:background="#FFFFFF"
  android:textColor="#D15FEE"
  android:textStyle="bold"
  android:gravity="left"
  android:text="Vitamin K"
   android:fadingEdge="horizontal|vertical"/>

  </TableRow>

  </TableLayout>
  </ScrollView>

 i get the following error:
 11-18 22:09:51.765: ERROR/AndroidRuntime(488): FATAL EXCEPTION: main
 11-18 22:09:51.765: ERROR/AndroidRuntime(488): java.lang.RuntimeException: Unable to start activity ComponentInfo{vitaminTable.xyz.com/vitaminTable.xyz.com.VitaminTable}: java.lang.ClassCastException: vitaminTable.xyz.com.VitaminTable
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.os.Handler.dispatchMessage(Handler.java:99)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.os.Looper.loop(Looper.java:123)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.ActivityThread.main(ActivityThread.java:4627)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at java.lang.reflect.Method.invokeNative(Native Method)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at java.lang.reflect.Method.invoke(Method.java:521)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at dalvik.system.NativeStart.main(Native Method)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488): Caused by: java.lang.ClassCastException: vitaminTable.xyz.com.VitaminTable
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at vitaminTable.xyz.com.VitaminTable.onCreate(VitaminTable.java:38)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
 11-18 22:09:51.765: ERROR/AndroidRuntime(488):     ... 11 more

Answer 1

您的问题写在日志中

ClassCastException异常

在这个位置

的onCreate（VitaminTable.java:38）

所以在第38行你将你的视图转换为错误的类型

抱歉，如果没有布局xml文件，但无法帮助您，但请检查您创建的视图类型，这应该可以解决问题

Answer 2

你的包名是向后的。应该是“com.xyz.vitaminTable”或者更好的“com.xyz.vitamin”。但这不应该是一个问题，除非你在Manifest中使用它不同。请提供AndroidManifest.xml的内容。

为了将它转换为OnClickListener，VitaminTable可以实现OnClickListener。

public class VitaminTable extends Activity implements OnClickListener {
  ...
  implement OnClickListener-Methods here
  ...
}

Answer 3

嗯，我不确切知道，但据我猜，尝试改变所有类似的线路：

vitaminA.setOnClickListener（（OnClickListener）this）;这样的事情

vitaminA.setOnClickListener（本）; ，

让你的Activity实现onCLickListener，并添加未实现的方法，只需遵循eclipse将为你提供的建议。

试试这可能对你有帮助..........

我的应用程序在开始时崩溃并给我一个强制关闭错误

3 个答案: