重新编辑:对于那些感兴趣的人,onClick的方法在下面解决了。事实证明,您无法为控件创建单独的类,因此按钮控件必须位于当前活动类中。
问题:在我的片段中,我已经包含了几个控件,其中一个是应该打开一个新活动的按钮。单击按钮时,我得到以下崩溃...
单击当前活动片段中的按钮时,这是LogCat错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.paymentdemo, PID: 14352
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_next_trans'
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:424)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:381)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
这是托管控件的片段
<?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:padding="16dp">
<TextView
android:id="@+id/transaction_header"
style="?textGroupheader"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="0dp"
android:layout_marginLeft="0dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="0dp"
android:layout_marginRight="0dp"
android:layout_marginBottom="20dp"
android:text="@string/group_header"
android:textStyle="bold" />
<!-- Spinner displays accounts available using SpinnerActivity -->
<include
layout="@layout/fragment_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<!-- Radio checks on or off. Still need to link selected as fragments for button on click behaviour -->
<include
layout="@layout/fragment_radio"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<!-- Button will take selected radio and open related activity, for now we just go to MainActivity -->
<include
layout="@layout/fragment_button"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
按钮控制代码
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ButtonActivity">
<Button
android:id="@+id/button_next_trans"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:background="@drawable/action_button"
android:paddingStart="24dp"
android:paddingLeft="24dp"
android:paddingTop="8dp"
android:paddingEnd="24dp"
android:paddingRight="24dp"
android:paddingBottom="8dp"
android:text="@string/next"
android:textColor="@color/colorWhite"
android:onClick="goToPayments"/>
</FrameLayout>
按钮活动
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
public class ButtonActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_button);
}
public void goToPayments(View view) {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
}
}
我没有经验,所以我的实施可能有点生疏。如果您对如何正确实现按钮onClick方法有任何建议,我将不胜感激。
你需要声明按钮和View for fragment这样
Button button;
public View myView;
然后在onCreate中初始化为这样
myView = inflater.inflate(R.layout.fragment_button,container,false);
button = (Button) myView.findViewById(R.id.button_next_trans);
然后创建这样的方法,
public void payments(){
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getActivity(),MainActivity.class)
startActivity(i);
}
}
}
并在onCreate()方法结束时返回视图。
return myView;
并致电付款();在onCreate
public class ButtonActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_button);
Button btnPay = (Button)findViewById(R.id.button_next_trans);
btnPay.setOnClickListener(this);
}
public void goToPayments(View view) {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
}
@Override
public void onClick(View v) {
{
switch (v.getId()) {
case R.id.button_next_trans:
goToPayments();
break;
}
}
}}
从xml中删除以下行
android:onClick="goToPayments"