java 如何解决错误：在 android:onClick 的父级或祖先上下文中找不到方法 onClick(View)
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How to solve error: Could not find method onClick(View) in a parent or ancestor Context for android:onClick
提问by Peter
I have seen that there's been some similar questions but the answers to those haven't helped me so far. The full error:
我已经看到有一些类似的问题，但到目前为止，这些问题的答案对我没有帮助。完整的错误：
java.lang.IllegalStateException: Could not find method onClick(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'button_random'
java.lang.IllegalStateException：无法在父级或祖先上下文中为 android:onClick 属性找到方法 onClick(View) 在视图类 android.support.v7.widget.AppCompatButton 上定义，id 为“button_random”
The class (StartActivity.java):
类（StartActivity.java）：
public class StartActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
}
public void onClick(View v) {
Log.d("DEBUG", "CLICKED " + v.getId());
}
}
The XML (activity_start.xml):
XML ( activity_start.xml)：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Random Game"
android:id="@+id/button_random"
android:layout_gravity="center_horizontal"
android:onClick="onClick" />
</LinearLayout>
I have added the activity to the AndroidManifest.xml. I have similar activities that work in the same way and I don't have any problems with those...
我已将活动添加到 AndroidManifest.xml。我有类似的活动，它们的工作方式相同，而且我对这些活动没有任何问题......
Does anyone see something where I am missing something or have made a mistake?
有没有人看到我遗漏了什么或犯了错误？
采纳答案by Alex Jolig
I had the same problem and in my case, I changed Buttonin XML to android.support.v7.widget.AppCompatButtonand it worked.
我遇到了同样的问题，在我的情况下，我将ButtonXML更改为android.support.v7.widget.AppCompatButton并且它起作用了。
Code with Error:
错误代码：
<Button
.... />
Fixed Code:
固定代码：
<android.support.v7.widget.AppCompatButton
.... />
回答by kgundula
Please rename onClickmethod to anything other than that, Android thinks you are calling the internal onClickfrom View.javaexposed via OnClickListenerinterface
请重新命名onClick方法比其他任何事情，Android的认为你是在调用内部onClick从View.java通过暴露OnClickListener接口
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Random Game"
android:id="@+id/button_random"
android:layout_gravity="center_horizontal"
android:onClick="myOnClick" />
and in your Activity
并在您的活动中
public class StartActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
}
public void myOnClick(View v) {
Log.d("DEBUG", "CLICKED " + v.getId());
}
}
You can check the View documentation here
您可以在此处查看查看文档
回答by Muhammad Waleed
You need to change android.support.v7.widget.AppCompatButton
你需要改变 android.support.v7.widget.AppCompatButton
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Random Game"
android:id="@+id/button_random"
android:layout_gravity="center_horizontal"
android:onClick="onClick" />
</LinearLayout>
回答by Ali Adil
I had the same issue, in my case I have 2 activities using the same layout so when I changed the OnClickevent name it will crash in other activity try to check the setContentViewlayout in the crashing activity
我遇到了同样的问题，在我的情况下，我有 2 个活动使用相同的布局，所以当我更改OnClick事件名称时，它会在其他活动中崩溃尝试检查setContentView崩溃活动中的布局
