Java 如果将按钮放置在视图上方,则ClassCastException
我在Java 如果将按钮放置在视图上方,则ClassCastException,java,android,android-layout,button,android-relativelayout,Java,Android,Android Layout,Button,Android Relativelayout,我在视图中创建的分隔线上方放置按钮时遇到问题。在下面的代码中,我放置了按钮和文本,如图所示: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingLeft="16dp" android:pad
视图中创建的分隔线上方放置按钮时遇到问题。在下面的代码中,我放置了按钮和文本,如图所示:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="16dp"
android:paddingRight="16dp" >
<LinearLayout
android:id="@+id/image_card_wrapper"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/image_card"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:baselineAlignBottom="false"
android:contentDescription="@string/image_card"
android:src="@drawable/image10herz" />
</LinearLayout>
<View
android:id="@+id/separator_card"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_below="@+id/image_card_wrapper"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:background="@android:color/darker_gray" />
<TextView
android:id="@+id/text_card_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/separator_card"
android:layout_marginRight="16dp"
android:text="test1"
android:textSize="14sp"
android:textStyle="bold" />
<View
android:id="@+id/separator_card_info"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_below="@+id/text_card_info"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:background="@android:color/darker_gray" />
<Button
android:id="@+id/button_next_card"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/separator_card_info"
android:text="@string/button_next_card"
android:textSize="12sp" />
<Button
android:id="@+id/button_klo_card"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/separator_card_info"
android:layout_toLeftOf="@+id/button_next_card"
android:text="@string/button_klo_card"
android:textSize="12sp"
android:visibility="visible" />
<Button
android:id="@+id/button_king"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/separator_card_info"
android:layout_toLeftOf="@+id/button_klo_card"
android:text="@string/button_king"
android:textSize="12sp"
android:visibility="visible" />
<ToggleButton
android:id="@+id/button_music"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/separator_copyright_play"
android:textOff="@string/button_music_off"
android:textOn="@string/button_music_on"
android:textSize="12sp"
android:visibility="visible" />
<View
android:id="@+id/separator_copyright_play"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_above="@+id/text_copyright_play"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:background="@android:color/darker_gray" />
<TextView
android:id="@+id/text_copyright_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_alignParentBottom="true"
android:text="@string/text_copyright" />
</RelativeLayout>
在我的onCreate()
方法中,我仅通过右按钮(ToggleButton
和Button
)的ID来强制转换视图。如果我不更改布局XML中的设置,这一切都可以正常工作,但是如果我这样做,如果我启动活动,就会得到相应的异常
编辑:添加了onCreate()方法
好吧,我找到了解决梅问题的办法,但我不知道为什么会这样。对于每个按钮,我都删除了标签android:visibility=“visible”
,现在它开始工作了。它在您的活动中存在问题尝试使用tablerow来处理所有按钮。将您的活动放入我的活动中,我将对其进行清理,生成并不能解决此问题,因为如果按钮像图中那样放置,它工作得很好。你能在com.mho.circleofdeathapp.PlayActivity.onCreate(PlayActivity.java:69)
周围贴几行吗?而且你没有@+id/水平线\u底部
,我猜你的意思是@+id/分隔符\u版权\u播放
?
05-28 16:48:12.624: E/AndroidRuntime(4260): FATAL EXCEPTION: main
05-28 16:48:12.624: E/AndroidRuntime(4260): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mho.circleofdeathapp/com.mho.circleofdeathapp.PlayActivity}: java.lang.ClassCastException: android.view.View cannot be cast to android.widget.ToggleButton
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.os.Handler.dispatchMessage(Handler.java:99)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.os.Looper.loop(Looper.java:137)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-28 16:48:12.624: E/AndroidRuntime(4260): at java.lang.reflect.Method.invokeNative(Native Method)
05-28 16:48:12.624: E/AndroidRuntime(4260): at java.lang.reflect.Method.invoke(Method.java:511)
05-28 16:48:12.624: E/AndroidRuntime(4260): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-28 16:48:12.624: E/AndroidRuntime(4260): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-28 16:48:12.624: E/AndroidRuntime(4260): at dalvik.system.NativeStart.main(Native Method)
05-28 16:48:12.624: E/AndroidRuntime(4260): Caused by: java.lang.ClassCastException: android.view.View cannot be cast to android.widget.ToggleButton
05-28 16:48:12.624: E/AndroidRuntime(4260): at com.mho.circleofdeathapp.PlayActivity.onCreate(PlayActivity.java:69)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.Activity.performCreate(Activity.java:5104)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-28 16:48:12.624: E/AndroidRuntime(4260): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-28 16:48:12.624: E/AndroidRuntime(4260): ... 11 more
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play);
// Show the Up button in the action bar.
setupActionBar();
nextCardButton = (Button) findViewById(R.id.button_next_card);
nextCardButton.setOnClickListener(this);
kloCardButton = (Button) findViewById(R.id.button_klo_card);
kloCardButton.setOnClickListener(this);
kingButton = (Button) findViewById(R.id.button_king);
kingButton.setOnClickListener(this);
soundButton = (ToggleButton) findViewById(R.id.button_music);
soundButton.setOnClickListener(this);
imageView = (ImageView) findViewById(R.id.image_card);
imageView.setImageBitmap(getImage(R.drawable.bier_head));
cardTextView = (TextView) findViewById(R.id.text_card_info);
initialize();
}