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分享关于ViewPager使用FragmentPagerAdapter的删除问题
删除非最后一个页面原来的数据还在。比如我用它来显示天气数据，现有北京，上海，广州三个城市，删除上海后，剩下北京和广州是没错，关键是广州显示的天气数据是原来上海的天气数据，然后添加一个城市，比如说天津，天津显示的就是之前广州的天气数据(重启应用后可以正常显示)各种能想到的都试过了，实在解决不了，各路大神有碰到过类似的吗
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陈小缘 2016-05-03
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你解决了吗？我是将FragmentPagerAdapter改为FragmentStatePagerAdapter就可以了，好久没逛论坛
lovatom1314 2016-03-07
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楼主解决没...同求方法
猴子写代码 2015-10-30
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首先，你代码贴的太多，来回答问题的人看到这么多代码都不想看。
把你的工程上传上来，我给你导入看一下
水的川 2015-10-30
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@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
HorizontalScrollView.LayoutParams lp = (HorizontalScrollView.LayoutParams)
rotationListener.getLayoutParams();
//切换为竖屏
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
if (lp.gravity != Gravity.NO_GRAVITY) {
lp.gravity = Gravity.NO_GRAVITY;
}
//切换为横屏
} else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
if (lp.gravity != Gravity.CENTER)
lp.gravity = Gravity.CENTER;
rotationListener.setLayoutParams(lp);
}
}
[/quote]看了你的代码感觉有点乱，说下我的实现思路吧，看你的代码是通过城市名请求得到数据，那你就把你添加的城市名按顺序存在一个数组或者list里面，当你在viewpager切换的时候判断当前的页面position是数组的哪一个城市，然后加载显示。
陈小缘 2015-10-30
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@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
HorizontalScrollView.LayoutParams lp = (HorizontalScrollView.LayoutParams)
rotationListener.getLayoutParams();
//切换为竖屏
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
if (lp.gravity != Gravity.NO_GRAVITY) {
lp.gravity = Gravity.NO_GRAVITY;
}
//切换为横屏
} else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
if (lp.gravity != Gravity.CENTER)
lp.gravity = Gravity.CENTER;
rotationListener.setLayoutParams(lp);
}
}
[/quote]看了你的代码感觉有点乱，说下我的实现思路吧，看你的代码是通过城市名请求得到数据，那你就把你添加的城市名按顺序存在一个数组或者list里面，当你在viewpager切换的时候判断当前的页面position是数组的哪一个城市，然后加载显示。
[/quote]自己解决不了，注释我已经写好了
陈小缘 2015-10-30
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@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
HorizontalScrollView.LayoutParams lp = (HorizontalScrollView.LayoutParams)
rotationListener.getLayoutParams();
//切换为竖屏
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
if (lp.gravity != Gravity.NO_GRAVITY) {
lp.gravity = Gravity.NO_GRAVITY;
}
//切换为横屏
} else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
if (lp.gravity != Gravity.CENTER)
lp.gravity = Gravity.CENTER;
rotationListener.setLayoutParams(lp);
}
}
[/quote]看了你的代码感觉有点乱，说下我的实现思路吧，看你的代码是通过城市名请求得到数据，那你就把你添加的城市名按顺序存在一个数组或者list里面，当你在viewpager切换的时候判断当前的页面position是数组的哪一个城市，然后加载显示。
[/quote]源码地址：https://github.com/wuyr/JwhkWeather能帮我看下吗
能帮我看下吗陈小缘 2015-10-30
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找不到在哪上传附件，这是github的地址https://github.com/wuyr/JwhkWeather重新写了下注释
重新写了下注释陈小缘 2015-10-29
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SubWeatherFragment源码：
public class SubWeatherFragment extends android.support.v4.app.Fragment {
private final String cityKey = "cityKey";
public static SubWeatherFragment fragment;
private SwipeRefreshLayout swipeRefreshLayout;
private View view;
private LinearLayout rotationListener;
private TextView updateTime, temperature, weather, humidity, windDirection,
windPower, sunRise, sunSet;
private List<Map<String, TextView>> forecasts;
private RecommendView comfort, uvPower, apparel, cold, drying, travel, umbrella;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
Map<String, String> baseInfo = (Map) ((List) msg.obj).get(0);
List<Map<String, String>> forecast = (List) ((List) msg.obj).get(1),
recommend = (List) ((List) msg.obj).get(2);
updateTime.setText(baseInfo.get("updatetime"));
temperature.setText(baseInfo.get("wendu"));
humidity.setText(baseInfo.get("shidu"));
windDirection.setText(baseInfo.get("fengxiang"));
windPower.setText(baseInfo.get("fengli"));
sunRise.setText(baseInfo.get("sunrise_1"));
sunSet.setText(baseInfo.get("sunset_1"));
weather.setText(forecast.get(0).get(Calendar.getInstance().get(Calendar.HOUR_OF_DAY) > 18 ? "type2" : "type"));
comfort.setValue(recommend.get(1).get("value").trim());
comfort.setInfo(recommend.get(1).get("detail").trim());
uvPower.setValue(recommend.get(6).get("value").trim());
uvPower.setInfo(recommend.get(6).get("detail").trim());
apparel.setValue(recommend.get(2).get("value").trim());
apparel.setInfo(recommend.get(2).get("detail").trim());
cold.setValue(recommend.get(3).get("value").trim());
cold.setInfo(recommend.get(3).get("detail").trim());
drying.setValue(recommend.get(4).get("value").trim());
drying.setInfo(recommend.get(4).get("detail").trim());
travel.setValue(recommend.get(5).get("value").trim());
travel.setInfo(recommend.get(5).get("detail").trim());
umbrella.setValue(recommend.get(10).get("value").trim());
umbrella.setInfo(recommend.get(10).get("detail").trim());
long currentTime;
for (int i = 0; i < forecasts.size(); i++) {
currentTime = System.currentTimeMillis() + ((86400 * 1000) * i);
forecasts.get(i).get("data").setText(new SimpleDateFormat("M月dd日").format(new Date(currentTime)));
forecasts.get(i).get("week").setText(new SimpleDateFormat("E").format(new Date(currentTime)));
forecasts.get(i).get("lowHigh").setText((forecast.get(i).get("low")).
substring(3, forecast.get(i).get("low").length() - 1) + "~" + (forecast.get(i).get("high")).
substring(3, forecast.get(i).get("high").length()));
forecasts.get(i).get("day").setText(forecast.get(i).get("type"));
forecasts.get(i).get("night").setText(forecast.get(i).get("type2"));
}
if (swipeRefreshLayout.isRefreshing()) {
swipeRefreshLayout.setRefreshing(false);
Toast toast = Toast.makeText(WeatherActivity.activity,
"更新天气成功", Toast.LENGTH_SHORT);
View view = toast.getView();
view.setBackgroundResource(R.color.toast_background);
toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.TOP, 0, 15);
toast.setView(view);
toast.show();
}
}
};
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
view = inflater.inflate(R.layout.weather_info, container, false);
initSwipeRefreshLayout();
initModules();
if (getArguments().getString(cityKey) != null) {
Log.e("onCreateView", getArguments().getString(cityKey));
refreshData(getArguments().getString(cityKey));
}
fragment = this;
return view;
}
private void initSwipeRefreshLayout() {
swipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.weather_refresh);
swipeRefreshLayout.setColorScheme(android.R.color.holo_red_light,
android.R.color.holo_orange_light, android.R.color.holo_green_light,
android.R.color.holo_blue_light);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
refreshData(getArguments().getString(cityKey));
}
});
}
@Override
public void onDestroyView() {
Log.e("onDestroyView", getArguments().getString(cityKey));
super.onDestroyView();
}
@Override
public void onDestroy() {
Log.e("onDestroy", getArguments().getString(cityKey));
super.onDestroy();
}
@Override
public void onDetach() {
Log.e("onDestroy", getArguments().getString(cityKey));
super.onDetach();
}
private void initModules() {
/*
初始化rotationListener
主要用来当屏幕切换为横屏时对齐方式为中部居中
*/
rotationListener = (LinearLayout) view.findViewById(R.id.listener_orientation);
updateTime = (TextView) view.findViewById(R.id.update_time);
//实例化主天气界面下的各种组件
updateTime = (TextView) view.findViewById(R.id.update_time);
temperature = (TextView) view.findViewById(R.id.temperature);
weather = (TextView) view.findViewById(R.id.weather);
humidity = (TextView) view.findViewById(R.id.humidity);
windDirection = (TextView) view.findViewById(R.id.wind_direction);
windPower = (TextView) view.findViewById(R.id.wind_power);
sunRise = (TextView) view.findViewById(R.id.sun_rise);
sunSet = (TextView) view.findViewById(R.id.sun_set);
comfort = (RecommendView) view.findViewById(R.id.comfort);
uvPower = (RecommendView) view.findViewById(R.id.uv_power);
apparel = (RecommendView) view.findViewById(R.id.apparel);
cold = (RecommendView) view.findViewById(R.id.cold);
drying = (RecommendView) view.findViewById(R.id.drying);
travel = (RecommendView) view.findViewById(R.id.travel);
umbrella = (RecommendView) view.findViewById(R.id.umbrella);
initForecast();
}
private void initForecast() {
forecasts = new ArrayList<>();
TextView date, week, lowHigh, day, night;
int id;
for (int i = 0; i < 5; i++) {
Map<String, TextView> tmp = new HashMap<>();
switch (i) {
case 0:
id = R.id.day_1;
break;
case 1:
id = R.id.day_2;
break;
case 2:
id = R.id.day_3;
break;
case 3:
id = R.id.day_4;
break;
case 4:
id = R.id.day_5;
break;
default:
id = -1;
}
if (id != -1) {
date = (TextView) view.findViewById(id).findViewById(R.id.date);
tmp.put("data", date);
week = (TextView) view.findViewById(id).findViewById(R.id.week);
tmp.put("week", week);
lowHigh = (TextView) view.findViewById(id).findViewById(R.id.low_high);
tmp.put("lowHigh", lowHigh);
day = (TextView) view.findViewById(id).findViewById(R.id.day);
tmp.put("day", day);
night = (TextView) view.findViewById(id).findViewById(R.id.night);
tmp.put("night", night);
forecasts.add(tmp);
}
}
}
public void refreshData(String cityKey) {
HttpUtil.sendGet("http://wthrcdn.etouch.cn/WeatherApi?citykey=" + cityKey, new HttpCallBackListener() {
@Override
public void onFinish(String data) {
Message message = new Message();
message.what = 0;
message.obj = new ParseXML().parse(data);
handler.sendMessage(message);
}
@Override
public void onError(Exception e) {
Log.e("setGet", "onError", e);
e.printStackTrace();
Looper.prepare();
Toast toast = Toast.makeText(WeatherActivity.activity,
"更新天气失败，请检查网络", Toast.LENGTH_LONG);
View view = toast.getView();
view.setBackgroundResource(R.color.toast_background);
toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.TOP, 0, 15);
toast.setView(view);
toast.show();
Looper.loop();
}
});
}
陈小缘 2015-10-29
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续上，超字数了
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
HorizontalScrollView.LayoutParams lp = (HorizontalScrollView.LayoutParams)
rotationListener.getLayoutParams();
//切换为竖屏
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
if (lp.gravity != Gravity.NO_GRAVITY) {
lp.gravity = Gravity.NO_GRAVITY;
}
//切换为横屏
} else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
if (lp.gravity != Gravity.CENTER)
lp.gravity = Gravity.CENTER;
rotationListener.setLayoutParams(lp);
}
}
陈小缘 2015-10-29
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CustomFragmentPagerAdapter源码：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import com.jwhk.weather.activity.WeatherActivity;
import com.jwhk.weather.fragment.SubWeatherFragment;
import com.jwhk.weather.utils.DataBasesUtil;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class CustomFragmentPagerAdapter extends FragmentPagerAdapter {
public List<String> addedCityName;
public Map<String, SubWeatherFragment> pages;
public CustomFragmentPagerAdapter(FragmentManager fm) {
super(fm);
addedCityName = new ArrayList<>();
pages = new HashMap<>();
}
@Override
public Fragment getItem(int position) {
return pages.get(addedCityName.get(position));
}
@Override
public int getCount() {
return pages.size();
}
public synchronized boolean addPage(final String cityName) {
if (addedCityName.contains(cityName))
return false;
addedCityName.add(cityName);
SubWeatherFragment fragment = new SubWeatherFragment();
Bundle bundle = new Bundle();
bundle.putString("cityKey", DataBasesUtil.queryCode(cityName).get(0));
//bundle.putString("cityName", cityName);
fragment.setArguments(bundle);
pages.put(cityName, fragment);
return true;
}
public synchronized boolean removePage(String cityName) {
if (addedCityName.size() > 1) {
WeatherActivity.removeCity(cityName);
addedCityName.remove(cityName);
pages.remove(cityName);
return true;
}
return false;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
----------------------------------------------------------------------------------
----------------------------------------------------------------------------------
WeatherFragment源码：
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.jwhk.weather.R;
import com.jwhk.weather.activity.WeatherActivity;
import com.jwhk.weather.adapter.CustomFragmentPagerAdapter;
import com.jwhk.weather.custom.TopView;
public class WeatherFragment extends android.support.v4.app.Fragment {
public static CustomFragmentPagerAdapter adapter;
public static ViewPager pager;
private static View view;
static {
adapter = new CustomFragmentPagerAdapter(WeatherActivity.activity.getSupportFragmentManager());
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
view = inflater.inflate(R.layout.weather_fragment_view, container, false);
initViewPager();
return view;
}
public static void initViewPager(){
pager = (ViewPager) view.findViewById(R.id.view_pager);
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
TopView.setTitleName(WeatherFragment.adapter.addedCityName.get(position));
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
pager.setAdapter(adapter);
}
}
水的川 2015-10-29
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你不给我们看代码怎么知道你错哪了。。。
shangguansb 2015-10-29
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pager上套的是什么容器？
陈小缘 2015-10-29
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pager上面是fragment,fragment上面是activity
陈小缘 2015-10-29
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我已经做过修改了，还是不行
水的川 2015-10-28
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相关代码呢？这应该根据你的page页数和数据绑定吧，你再删除后要对相应地页面逻辑作出相应地修改。
android view重新加载数据库,Android ViewPager的FragmentPagerAdapter中Fragment不重新加载数据，并且使用的是其他缓存的Framgnet的问题...
