片段中的onClick方法永远不会被调用

Question

I tried to set up a onClickListener inside my fragment.

public class HomeFragment extends Fragment implements View.OnClickListener {

Button btn_eventList;
public HomeFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_home, container, false);

    btn_eventList = (Button) view.findViewById(R.id.buttonEventList);
    btn_eventList.setOnClickListener(this);

    return view;
}

@Override
public void onClick(View v) {
    btn_eventList.setText("TEST");
    Toast.makeText(getActivity(), "TEST" , Toast.LENGTH_SHORT).show();
}

}

Here is my layout:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nvd"
    android:layout_height="match_parent"
    android:layout_width="match_parent">



    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/textView2"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    android:fontFamily="sans-serif"
                    android:gravity="center"
                    android:text="test"
                    android:textAppearance="@style/TextAppearance.AppCompat.Display1"
                    />

                <TextView
                    android:id="@+id/textView4"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/textView2"
                    android:layout_centerHorizontal="true"
                    android:layout_marginTop="1dp"
                    android:gravity="center"
                    android:text="test"
                    />
            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentStart="true"
                android:layout_alignParentTop="true"
                android:layout_marginTop="45dp"
                android:orientation="horizontal">

                <Button
                    android:id="@+id/buttonEventList"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="Button" />

                <Button
                    android:id="@+id/button9"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="Button" />

                <Button
                    android:id="@+id/button7"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="Button" />
            </LinearLayout>

            <android.support.v7.widget.RecyclerView
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

            </android.support.v7.widget.RecyclerView>

        </LinearLayout>

    </RelativeLayout>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/lst_nav_drawer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layoutManager="android.support.v7.widget.LinearLayoutManager"
        >

    </android.support.v7.widget.RecyclerView>
</android.support.v4.widget.DrawerLayout>

Does anyone know why the onClick method never gets called when I hit my button? Did I miss anything?

Answer 1

EDIT

Since Sevin made me notice I was not giving you a solution but an alternative way for reaching your goal, I'm editing this.

First: your code must work

The code you posted is correct

Now, do some checks:

• Check if in debug mode the button is not null (should have throwed exception)
• Check if in debug mode you are reaching the onClick, even if the text doesn't change and even if the toast doesn't show up.
• Check if you are showing the fragment properly. Here is the official documentation about how to create a fragment.
• Check if the fragment is clickable and if it has anything over it (simply, the button once clicked shows the classic "click" animation?)
• Check in the xaml code if the id you used is assigned to the correct button.

And finally do some the following operations:

• Clean your project
• Rebuild your project
• Check if in both xaml and java code you have any alert (in basic configurations, yellow mark over the line)
• Uninstall the app and re-install it (pretty much the same, but since we don't know your project, it can still help)

After those, let us know

Possible solution:

You have a recycleview which is on top of the button . you have this view set with match parent both height and width inside a relativelayout , it means that this view will cover the button.

Remove this empty recycleview and the code will work

Answer 2

EDIT

after posting your layout I can conclude with total certainty that your REcyclerView is taking all the space of your layout thus taking all the touch inputs from whats behind.

Solutions:

You can either delete the recycler view or re-arrange it and add it to last RelativeLayout and use layout_below and placing it below the a LinearLayout

Answer 3

The problem is that you didn't implement this method right. onClick() method doesn't know, what view concretely has been clicked. Change your onClick() method to the following form:

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.your_button_id: 
            btn_eventList.setText("TEST");
            Toast.makeText(getActivity(), "TEST" , Toast.LENGTH_SHORT).show();
            break;
    }
}