Question

我有一个片段Activity Bhawan_page1，我想在按钮点击时调用另一个活动，但我收到两个错误 1.无法解决方法＆＃39; findViewById（int）＆＃39; 2.无法解析构造函数＆＃39; Intent（匿名android.view.View.OnClickListener，java.lang.Class）＆＃39;

以下是活动的代码

package in.ahmedraza.journey;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import in.ahmedraza.material_tab.ObservableScrollView;
import in.ahmedraza.material_tab.ScrollUtils;
import in.ahmedraza.material_tab.Scrollable;

public class Bhawan_page1 extends FlexibleSpaceWithImageBaseFragment<ObservableScrollView> {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_bhawan_page1, container, false);

        final ObservableScrollView scrollView = (ObservableScrollView) view.findViewById(R.id.scroll);
        // TouchInterceptionViewGroup should be a parent view other than ViewPager.
        // This is a workaround for the issue #117:
        // https://github.com/ksoichiro/Android-ObservableScrollView/issues/117
        scrollView.setTouchInterceptionViewGroup((ViewGroup) view.findViewById(R.id.fragment_root));

        // Scroll to the specified offset after layout
        Bundle args = getArguments();
        if (args != null && args.containsKey(ARG_SCROLL_Y)) {
            final int scrollY = args.getInt(ARG_SCROLL_Y, 0);
            ScrollUtils.addOnGlobalLayoutListener(scrollView, new Runnable() {
                @Override
                public void run() {
                    scrollView.scrollTo(0, scrollY);
                }
            });
            updateFlexibleSpace(scrollY, view);
        } else {
            updateFlexibleSpace(0, view);
        }

        scrollView.setScrollViewCallbacks(this);

        return view;

        Button btn1 = (Button) findViewById(R.id.full_story_bhawan);
        btn1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Intent myIntent = new Intent(this, DialogMainActivity.class);
                startActivity(myIntent);
            }
        });
    }

    @Override
    protected void updateFlexibleSpace(int scrollY) {
        // Sometimes scrollable.getCurrentScrollY() and the real scrollY has different values.
        // As a workaround, we should call scrollVerticallyTo() to make sure that they match.
        Scrollable s = getScrollable();
        s.scrollVerticallyTo(scrollY);

        // If scrollable.getCurrentScrollY() and the real scrollY has the same values,
        // calling scrollVerticallyTo() won't invoke scroll (or onScrollChanged()), so we call it here.
        // Calling this twice is not a problem as long as updateFlexibleSpace(int, View) has idempotence.
        updateFlexibleSpace(scrollY, getView());
    }

    @Override
    protected void updateFlexibleSpace(int scrollY, View view) {
        ObservableScrollView scrollView = (ObservableScrollView) view.findViewById(R.id.scroll);

        // Also pass this event to parent Activity
        BhawanHome parentActivity =
                (BhawanHome) getActivity();
        if (parentActivity != null) {
            parentActivity.onScrollChanged(scrollY, scrollView);
        }
    }
}

xml文件的代码

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_root"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <in.ahmedraza.material_tab.ObservableScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:overScrollMode="never"
        android:scrollbars="none">

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

            <View
                android:layout_width="match_parent"
                android:layout_height="@dimen/flexible_space_image_height"
                android:background="@android:color/transparent" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@android:color/white"
                android:paddingBottom="@dimen/activity_vertical_margin"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:text="@string/bhawan_story" />

            <Button
                android:id="@+id/full_story_bhawan"
                android:layout_width="60dp"
                android:layout_height="30dp"
                android:text="Complete Story"
                android:onClick="true"
                android:padding="@color/white"
                android:background="@color/red"
                android:gravity="center"/>
        </LinearLayout>
    </in.ahmedraza.material_tab.ObservableScrollView>
</FrameLayout>

Answer 1

片段没有findViewById方法。需要从

修复此方法的单次调用

Button btn1 = (Button) findViewById(R.id.full_story_bhawan);

到

Button btn1 = (Button) view.findViewById(R.id.full_story_bhawan);

第二件事。返回statemant后不要写代码。它永远不会被执行。设置onCreateView后，移动onClickListener的返回值。

最后是onClickListener。改变这个：

Intent myIntent = new Intent(this, DialogMainActivity.class);

到

Intent myIntent = new Intent(getActivity(), DialogMainActivity.class);

Intent构造函数的第一个参数是context。代码中的this引用匿名onClickListener而不是任何类型的上下文，因此需要修复它。希望它能解决你的问题。

编辑：

android:padding="@color/white"

这永远无法奏效：P将其更改为正确的尺寸值。

无法在类中解析方法findViewById（int）

1 个答案: