java - onClickListener 无法在 Fragment 中工作

Question

当我单击其中一个 fragment 中的按钮时，没有任何反应，监听器无法工作。每当我输入按钮尝试转换到按钮时，它都不会像应该的那样变成紫色。

Java:

public class CollegeMatch extends Fragment {
    TextView resuLTS;
    EditText actorsat;
    EditText rank;
    EditText gpa;
    EditText apclasses;
    public Button calcButton;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_college_match, container, false);    

        resuLTS = (TextView) view.findViewById(R.id.resuLTS);
        actorsat = (EditText) view.findViewById(R.id.actorsat);
        gpa = (EditText) view.findViewById(R.id.gpa);
        rank = (EditText) view.findViewById(R.id.rank);
        apclasses = (EditText) view.findViewById(R.id.apclasses);
        Button calcButton;
        calcButton = (Button) view.findViewById(R.id.calcButton);
        calcButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view2) {
                float act = Float.parseFloat(actorsat.getText().toString());
                float ap = Float.parseFloat(apclasses.getText().toString());
                float rk = Float.parseFloat(rank.getText().toString());
                float gp = Float.parseFloat(gpa.getText().toString());
                float res = act + ap + rk + gp;
                resuLTS.setText(Float.toString(res));    
            }    
        });
        return view;
    }    
}

XML:

<RelativeLayout 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="layout.CollegeMatch"
        android:background="#bdeaf4"
        android:id="@+id/calcBTN">

    <!-- TODO: Update blank fragment layout -->

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Find colleges!"
        android:id="@+id/textView134"
        android:layout_marginTop="50dp"
        android:textColor="#000000"
        android:textSize="37dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:typeface="serif"
        android:textStyle="bold" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/actorsat"
        android:layout_marginTop="57dp"
        android:autoText="false"
        android:hint="Enter  Composite Score "
        android:layout_below="@+id/textView134"
        android:layout_alignLeft="@+id/gpa"
        android:layout_alignStart="@+id/gpa" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ACT  Composite"
        android:id="@+id/textView135"
        android:textColor="@color/abc_input_method_navigation_guard"
        android:textSize="25dp"
        android:layout_alignBottom="@+id/actorsat"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="46dp"
        android:layout_marginStart="46dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Unweighted GPA"
        android:id="@+id/textView136"
        android:textColor="@color/abc_input_method_navigation_guard"
        android:textSize="25dp"
        android:layout_marginTop="35dp"
        android:layout_below="@+id/textView135"
        android:layout_alignLeft="@+id/textView135"
        android:layout_alignStart="@+id/textView135" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Class Rank (Top _ %)"
        android:id="@+id/textView138"
        android:textColor="@color/abc_input_method_navigation_guard"
        android:textSize="25dp"
        android:layout_marginTop="47dp"
        android:layout_below="@+id/textView136"
        android:layout_alignLeft="@+id/textView136"
        android:layout_alignStart="@+id/textView136" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/rank"
        android:layout_above="@+id/tex554"
        android:layout_alignLeft="@+id/apclasses"
        android:layout_alignStart="@+id/apclasses"
        android:hint="Enter Here  (omit % sign) " />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Total # of AP classes"
        android:id="@+id/tex554"
        android:textColor="@color/abc_input_method_navigation_guard"
        android:textSize="25dp"
        android:layout_marginTop="39dp"
        android:layout_below="@+id/textView138"
        android:layout_alignLeft="@+id/textView138"
        android:layout_alignStart="@+id/textView138" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/apclasses"
        android:hint="Enter number here"
        android:layout_alignBottom="@+id/tex554"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Match Me!"
        android:id="@+id/calcButton"
        android:layout_marginTop="57dp"
        android:background="#ff0000"
        android:textColor="#ffffff"
        android:textSize="50dp"
        android:layout_below="@+id/apclasses"
        android:layout_alignLeft="@+id/textView134"
        android:layout_alignStart="@+id/textView134" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Your College Match Results:"
        android:id="@+id/textView155"
        android:textColor="@color/abc_input_method_navigation_guard"
        android:textSize="32dp"
        android:layout_marginTop="46dp"
        android:textStyle="normal|bold|italic"
        android:layout_below="@+id/calcButton"
        android:layout_centerHorizontal="true" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"
        android:ems="10"
        android:id="@+id/gpa"
        android:hint="Enter GPA here"
        android:layout_above="@+id/textView138"
        android:layout_alignLeft="@+id/rank"
        android:layout_alignStart="@+id/rank" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0"
        android:id="@+id/resuLTS"
        android:layout_below="@+id/textView155"
        android:layout_alignLeft="@+id/textView155"
        android:layout_alignStart="@+id/textView155"
        android:layout_marginTop="76dp"
        android:layout_alignRight="@+id/textView155"
        android:layout_alignEnd="@+id/textView155"
        android:textColor="#000000"
        android:textIsSelectable="false"
        android:textSize="25dp" />

</RelativeLayout>

Answer 1

您正在 onViewCreated() 方法中执行操作。创建 View 后会触发此方法，因此它不会应用您的内容。

将代码移至 onCreateView() 内，如下所示:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_college_match, container, false);

    //do stuffs, for example:

    resuLTS = (TextView) view.findViewById(R.id.resuLTS);
    actorsat = (EditText) view.findViewById(R.id.actorsat);
    gpa = (EditText) view.findViewById(R.id.gpa);
    rank = (EditText) view.findViewById(R.id.rank);
    apclasses = (EditText) view.findViewById(R.id.apclasses);

    Button calcbutton = (Button) view.findViewById(R.id.calcbutton);
    calcbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick (View view2) {
            float act = Float.parseFloat(actorsat.getText().toString());
            float ap = Float.parseFloat(apclasses.getText().toString());
            float rk = Float.parseFloat(rank.getText().toString());
            float gp = Float.parseFloat(gpa.getText().toString());
            float res = act + ap +rk +gp;
            resuLTS.setText(Float.toString(res));

        }

    });
    return view;
}

这应该可行(我已经用完了编译器，所以对于我在这里的任何问题，这可能并不完美)