Question

这里我添加了Java和Xml文件，当用户单击按钮时，我只想在其中显示Toast。

这只是检查Fragment是否正常工作。

在此，onClickListener在Fragment中对我不起作用。我尝试时，甚至TextView上的setText也无法正常工作。我认为组件存在一些问题，或者java和xml文件之间的连接存在一些问题

Setting.java

    package com.example.dell.jsonexp;

    import android.content.Context;
    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.os.Bundle;
    import android.support.annotation.Nullable;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.Toast;

    public class setting extends Fragment {
        BackgroundTask b;
    String e;
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View RootView = inflater.inflate(R.layout.setting, container, false);

            final Button logout= (Button) RootView.findViewById(R.id.logout);
            logout.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Toast.makeText(getActivity(),"Button Pressed",Toast.LENGTH_LONG).show();


                }
            });

            return inflater.inflate(R.layout.setting, container, false);
        }


    }

setting.xml

        <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent" android:layout_height="match_parent">

        <Button
            android:id="@+id/logout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="50dp"
            android:text="Logout" />
    </RelativeLayout>

Answer 1

您正在将点击侦听器设置为一个从未显示的按钮。

您需要返回rootView而不是夸大其他视图。

return rootView;

Answer 2

在onCreateView()中，您无法使用Override方法访问视图组件，而您必须使用onViewCreated() package com.example.dell.jsonexp; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class setting extends Fragment { BackgroundTask b; String e; @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.setting, container, false); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); Button logout= (Button) view.findViewById(R.id.logout); logout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getActivity(),"Button Pressed",Toast.LENGTH_LONG).show(); } }); } }方法。请按如下所示更新您的代码。

Pass{
        Name "OUTLINE"
        Cull Off
        ZWrite Off
        ZTest Always
        Blend SrcAlpha OneMinusSrcAlpha
    CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#pragma multi_compile_fog

    fixed4 frag(v2f IN) : SV_Target
    {
        fixed4 c = tex2D(_MainTex, IN.texcoord) * IN.color;

        if (c.a > _Cutoff) {
            float totalAlpha = 1.0;

            [unroll(16)]
            for (int i = 1; i < _OutlineSize + 1; i++) {
                fixed4 pixelUp = tex2D(_MainTex, IN.texcoord + fixed2(0, i * _MainTex_TexelSize.y));
                fixed4 pixelDown = tex2D(_MainTex, IN.texcoord - fixed2(0, i *  _MainTex_TexelSize.y));
                fixed4 pixelRight = tex2D(_MainTex, IN.texcoord + fixed2(i * _MainTex_TexelSize.x, 0));
                fixed4 pixelLeft = tex2D(_MainTex, IN.texcoord - fixed2(i * _MainTex_TexelSize.x, 0));

                totalAlpha = totalAlpha * pixelUp.a * pixelDown.a * pixelRight.a * pixelLeft.a;
            }

            if (totalAlpha == 0) {
                c.rgba = fixed4(0.4, 1, 1, 1);
            }
            else
                c.rgba = fixed4(0.5, 0.5, 0.5, .5);
        }

        c.rgb *= c.a;
        return c;
    }

    ENDCG
    }

谢谢！

Answer 3

您需要返回

return RootView;

，对于 Toast ，您必须写

getActivity().runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(getContext(), "Whatever you want here", Toast.LENGTH_SHORT).show();
        }
    });

无法在片段中显示吐司

3 个答案: