为什么xml布局不起作用？我打开布局页面时收到错误消息，请帮助我，什么问题，我不明白，有什么想法吗？谢谢你的回答...
我的 xml 布局代码；
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="@+id/myfivepanelpager"
android:layout_width="match_parent"
android:layout_height="440dp" >
</android.support.v4.view.ViewPager>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="46dp"
android:background="@drawable/bck2" >
<Button
android:id="@+id/buttonprevious"
android:layout_width="62dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="@drawable/lefticon" />
<Button
android:id="@+id/buttonnext"
android:layout_width="62dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="@drawable/righticon" />
</RelativeLayout>
</LinearLayout>
Logcat 错误信息；
10-29 16:26:13.422: E/AndroidRuntime(2187): FATAL EXCEPTION: main
10-29 16:26:13.422: E/AndroidRuntime(2187): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hayvansesleri/com.hayvansesleri.Pictures}: java.lang.ClassCastException: android.widget.Button cannot be cast to android.support.v4.view.ViewPager
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.ActivityThread.access$600(ActivityThread.java:127)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.os.Handler.dispatchMessage(Handler.java:99)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.os.Looper.loop(Looper.java:137)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.ActivityThread.main(ActivityThread.java:4441)
10-29 16:26:13.422: E/AndroidRuntime(2187): at java.lang.reflect.Method.invokeNative(Native Method)
10-29 16:26:13.422: E/AndroidRuntime(2187): at java.lang.reflect.Method.invoke(Method.java:511)
10-29 16:26:13.422: E/AndroidRuntime(2187): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-29 16:26:13.422: E/AndroidRuntime(2187): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-29 16:26:13.422: E/AndroidRuntime(2187): at dalvik.system.NativeStart.main(Native Method)
10-29 16:26:13.422: E/AndroidRuntime(2187): Caused by: java.lang.ClassCastException: android.widget.Button cannot be cast to android.support.v4.view.ViewPager
10-29 16:26:13.422: E/AndroidRuntime(2187): at com.hayvansesleri.Pictures.onCreate(Pictures.java:38)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.Activity.performCreate(Activity.java:4465)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
10-29 16:26:13.422: E/AndroidRuntime(2187): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
10-29 16:26:13.422: E/AndroidRuntime(2187): ... 11 more
图片.class;
public class Pictures extends Activity implements OnPageChangeListener,OnClickListener {
protected static final Context Context = null;
private static final int count = 23;
private AdController myController;
SoundManager snd;
View view=null;
final Activity act = this;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInsta,mknceState);
setContentView(R.layout.picturespage);
MyPagerAdapter adapter = new MyPagerAdapter();
final ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(12);
myPager.setOnPageChangeListener(this);
snd = new SoundManager(this);
this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
Button next = (Button) findViewById(R.id.buttonnext);
next.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
myPager.setCurrentItem(myPager.getCurrentItem()+1);
}
});
Button previous = (Button) findViewById(R.id.buttonprevious);
previous.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
myPager.setCurrentItem(myPager.getCurrentItem()-1);
}
});
};