在ViewPager中使用SwipeRefreshLayout呈现的列表的冻结快照 [英] Frozen snapshot of list rendered with SwipeRefreshLayout in ViewPager

查看：101 发布时间：2020/5/2 10:06:24 android listview android-fragments android-viewpager swiperefreshlayout

本文介绍了在ViewPager中使用SwipeRefreshLayout呈现的列表的冻结快照的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

考虑一个Android活动，该活动是android.support.v4.app.FragmentActivity的子类.它包含由FragmentStatePagerAdapter管理的几个apges.每个页面包含由android.support.v4.widget.SwipeRefreshLayout包装的ListView.以下屏幕截图显示了此活动的初始状态.

Consider an Android activity that is subclass ofandroid.support.v4.app.FragmentActivity. It contains several apges managed by FragmentStatePagerAdapter. Each page contains a ListView wrapped by android.support.v4.widget.SwipeRefreshLayout. The following screenshot shows the initial state of this activity.

现在，我向下滑动以刷新页面0上的列表.出现刷新动画.现在，让我们在第2页上向右滑动，然后回到第0页.

Now, I swipe down to refresh the list on page 0. The refresh animation appears. Now, let's swipe to the right on page 2 and then back to page 0.

刷新动画仍然可见.这对我来说很奇怪，因为第0页被破坏并再次创建.此外，如果我向上滑动(尝试滚动到页面0的列表的末尾)，则会在页面上呈现一些奇怪的图层，该图层似乎包含该页面自被破坏以来的旧状态.

The refresh animation is still visible. This seems strange to me as page 0 was destroyed and created again. Moreover, if I swipe up (trying to scroll to the end of the list on page 0) some strange layer is rendered over the page which seems to contain the old state of the page from the time it was destroyed.

我不知道为什么会这样以及如何解决.感谢您的帮助.

I have no idea why this happens and how to fix it. Thanks for any help.

这是一个最小应用程序的源代码，该应用程序由3个布局文件，一个活动类，一个片段类，一个清单文件和一个构建脚本组成.

Here is the source code of a minimal application that consists of 3 layout files, an activity class, a fragment class, a manifest file and a build script.

swipeandroid/src/main/res/layout/service_schedule_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/servicePager"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.PagerTabStrip
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"/>

</android.support.v4.view.ViewPager>

swipeandroid/src/main/res/layout/service_schedule_tab_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/serviceRefreshLayout"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/timeSlots"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</android.support.v4.widget.SwipeRefreshLayout>

swipeandroid/src/main/res/layout/service_schedule_row.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="wrap_content">

    <TextView
        android:id="@+id/time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"/>

</RelativeLayout>

swipeandroid/src/main/java/com/swipetest/ServiceScheduleActivity.java

package com.swipetest;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;

public class ServiceScheduleActivity extends FragmentActivity {
    @Override
    protected void onCreate(final Bundle inState) {
        // call super class
        super.onCreate(inState);

        // set content
        setContentView(R.layout.service_schedule_activity);

        // set up service pager
        ((ViewPager) findViewById(R.id.servicePager)).setAdapter(new ServiceFragmentPagerAdapter());
    }

    private class ServiceFragmentPagerAdapter extends FragmentStatePagerAdapter {
        public ServiceFragmentPagerAdapter() {
            super(getSupportFragmentManager());
        }

        @Override
        public int getCount() {
            return 5;
        }

        @Override
        public Fragment getItem(final int position) {
            return ServiceScheduleTabFragment.newInstance(position);
        }

        @Override
        public CharSequence getPageTitle(final int position) {
            return String.format("page %d", position);
        }
    }
}

swipeandroid/src/main/java/com/swipetest/ServiceScheduleTabFragment.java

package com.swipetest;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class ServiceScheduleTabFragment extends Fragment {
    private static final String TAB_POSITION_ARGUMENT = "tabPosition";

    public static ServiceScheduleTabFragment newInstance(final int tabPosition) {
        // prepare arguments
        final Bundle arguments = new Bundle();
        arguments.putInt(TAB_POSITION_ARGUMENT, tabPosition);

        // create fragment
        final ServiceScheduleTabFragment fragment = new ServiceScheduleTabFragment();
        fragment.setArguments(arguments);
        return fragment;
    }

    @Override
    public View onCreateView(final LayoutInflater layoutInflater, final ViewGroup parent, final Bundle inState) {
        // create fragment root view
        final View rootView = layoutInflater.inflate(R.layout.service_schedule_tab_fragment, parent, false);

        // initialize time slot list view
        final ListView timeSlotListView = (ListView) rootView.findViewById(R.id.timeSlots);
        timeSlotListView.setAdapter(new TimeSlotListAdapter());

        // return fragment root view
        return rootView;
    }

    private int getTabPosition() {
        return getArguments().getInt(TAB_POSITION_ARGUMENT);
    }

    private static class TimeSlotRowViewHolder {
        private final TextView timeView;

        public TimeSlotRowViewHolder(final View rowView) {
            timeView = (TextView) rowView.findViewById(R.id.time);
        }

        public TextView getTimeView() {
            return timeView;
        }
    }

    private class TimeSlotListAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return 80;
        }

        @Override
        public Object getItem(final int position) {
            return position;
        }

        @Override
        public long getItemId(final int position) {
            return position;
        }

        @Override
        public View getView(final int position, final View convertView, final ViewGroup parent) {
            // reuse or create row view
            final View rowView;
            if (convertView != null) {
                rowView = convertView;
            } else {
                rowView = LayoutInflater.from(getContext()).inflate(R.layout.service_schedule_row, parent, false);
                rowView.setTag(new TimeSlotRowViewHolder(rowView));
            }

            // fill data
            final TimeSlotRowViewHolder rowViewHolder = (TimeSlotRowViewHolder) rowView.getTag();
            rowViewHolder.getTimeView().setText(String.format("tab %d, row %d", getTabPosition(), position));
            return rowView;
        }
    }
}

swipeandroid/src/main/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.swipetest"
          android:versionCode="1"
          android:versionName="1.0">

    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="23"/>

    <application
        android:name="android.app.Application"
        android:label="Swipe Test"
        android:allowBackup="false">

        <activity
            android:name="com.swipetest.ServiceScheduleActivity">

            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>

        </activity>

    </application>

</manifest>

swipeandroid/build.gradle

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0'
    }
}

apply plugin: 'com.android.application'

repositories {
    mavenCentral()
}

dependencies {
    compile "com.android.support:support-v4:23.1.1"
}

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    buildTypes {
        debug {
            debuggable true
            minifyEnabled false
        }
    }
}

在ViewPager中使用SwipeRefreshLayout呈现的列表的冻结快照 [英] Frozen snapshot of list rendered with SwipeRefreshLayout in ViewPager

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在ViewPager中使用SwipeRefreshLayout呈现的列表的冻结快照 [英] Frozen snapshot of list rendered with SwipeRefreshLayout in ViewPager

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