问题描述
second_fragment.xml
second_fragment.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/f2_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/f2_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/f2_tv" />
<Button
android:id="@+id/f2_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="button"
android:text="@string/f2_bttn" />
SecondFragment.java
SecondFragment.java
public class SecondFragment extends Fragment {
FragmentInterface iface;
public interface FragmentInterface {
public void buttonPressed();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.second_fragment, container, false);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
try {
iface = (FragmentInterface) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement FragmentInterface");
}
}
public void button(View view) {
}
}
我是新手,我不知道为什么我的应用程序在按下按钮时崩溃?谁能解释一下?
I'm newbie and I have no idea why my application crash, when button is pressed ? Can anyone explain?
01-03 13:28:25.612: E/AndroidRuntime(1276): FATAL EXCEPTION: main
01-03 13:28:25.612: E/AndroidRuntime(1276): java.lang.IllegalStateException: Could not find a method button(View) in the activity class com.sp.fragments.MainActivity for onClick handler on view class android.widget.Button with id 'f2_button'
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View$1.onClick(View.java:3584)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View.performClick(View.java:4202)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View$PerformClick.run(View.java:17340)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.os.Handler.handleCallback(Handler.java:725)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.os.Handler.dispatchMessage(Handler.java:92)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.os.Looper.loop(Looper.java:137)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.app.ActivityThread.main(ActivityThread.java:5039)
01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.reflect.Method.invokeNative(Native Method)
01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.reflect.Method.invoke(Method.java:511)
01-03 13:28:25.612: E/AndroidRuntime(1276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-03 13:28:25.612: E/AndroidRuntime(1276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-03 13:28:25.612: E/AndroidRuntime(1276): at dalvik.system.NativeStart.main(Native Method)
01-03 13:28:25.612: E/AndroidRuntime(1276): Caused by: java.lang.NoSuchMethodException: button [class android.view.View]
01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.Class.getConstructorOrMethod(Class.java:460)
01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.Class.getMethod(Class.java:915)
01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View$1.onClick(View.java:3577)
01-03 13:28:25.612: E/AndroidRuntime(1276): ... 11 more
01-03 13:28:27.563: I/Process(1276): Sending signal. PID: 1276 SIG: 9
推荐答案
活动:
如果有活动并且如果您在 XML 中定义了 android:onClick
属性,那么您只需要在 Activity 中定义一个具有相同名称的方法.
If are having activity and if you define android:onClick
attribute in XML then you just need to define a method with the same name in Activity.
片段:
但是,只要您有 Fragment,并且如果您想通过定义 android:onClick
属性来定义点击侦听器,那么您必须在调用 Fragment 的实际活动中定义一个具有相同名称的方法.
But whenever you have Fragment and if you want to define click listener by just defining android:onClick
attribute then you have to define a method with the same name in actual activity from where Fragment has been called.
或者您可以简单地以编程方式实现点击侦听器.
OR you can simply implement a click listener programmatically.
这篇关于Android 应用程序崩溃(片段和 xml onclick)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!