刷卡时​​,Android的滚动标签+刷卡状态 [英] Android Scrollable Tabs + Swipe state when swiping

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问题描述

我试图与多个选项卡的应用程序。对于每个选项卡,我用不同的片段。而当通过选项卡在其中的信息正在改变我做人。

如何保存每个选项卡的状态,刷卡的时候?

code,例如:

MainActivity.java

 包com.tabs.example;

进口java.util.Locale中;

进口android.graphics.Color;
进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.support.v4.app.FragmentActivity;
进口android.support.v4.app.FragmentManager;
进口android.support.v4.app.FragmentPagerAdapter;
进口android.support.v4.view.PagerTabStrip;
进口android.support.v4.view.ViewPager;

公共类MainActivity扩展FragmentActivity {

    SectionsPagerAdapter mSectionsPagerAdapter;
    ViewPager mViewPager;

    @覆盖
    保护无效的onCreate(包savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(R.layout.activity_main);

        mSectionsPagerAdapter =新SectionsPagerAdapter(getSupportFragmentManager());

        mViewPager =(ViewPager)findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        PagerTabStrip pagerTabStrip =(PagerTabStrip)findViewById(R.id.pager_tab_strip);
        pagerTabStrip.setBackgroundColor(Color.BLACK);
        pagerTabStrip.setTabIndicatorColor(Color.CYAN);
        pagerTabStrip.setTextColor(Color.WHITE);
    }

    公共类SectionsPagerAdapter扩展FragmentPagerAdapter {

        公共SectionsPagerAdapter(FragmentManager FM){
            超(FM);
        }

        @覆盖
        公共片段的getItem(INT位置){

            片段片段
            开关(位置){
                情况下0:
                    片段=新片段1();
                    打破;
                情况1:
                    片段=新Fragment2();
                    打破;
                案例2:
                    片段=新Fragment3();
                    打破;
                默认:
                    片段= NULL;
                    打破;
            }
            返回片段;

        }

        @覆盖
        公众诠释getCount将(){
            返回3;
        }

        @覆盖
        公共CharSequence的getPageTitle(INT位置){
            区域设置L = Locale.getDefault();
            开关(位置){
                情况下0:
                    返回的getString(R.string.title_section1).toUpperCase(升);
                情况1:
                    返回的getString(R.string.title_section2).toUpperCase(升);
                案例2:
                    返回的getString(R.string.title_section3).toUpperCase(升);
            }
            返回null;
        }
    }
}
 

Fragment1.java

 包com.tabs.example;

进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.TextView;

进口java.text.DateFormat中;
进口java.text.SimpleDateFormat的;
进口java.util.Date;

公共类片段1扩展片段{

    @覆盖
    公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,捆绑savedInstanceState){

        查看根= inflater.inflate(R.layout.fragment1,集装箱,假);

        日期格式日期格式=新的SimpleDateFormat(HH:MM:SS);
        日期日期=新的日期();
        字符串时间= dateFormat.format(日期);

        TextView的TV1 =(TextView中)root.findViewById(R.id.tv1);
        tv1.setText(时间);

        返回根;

    }
}
 

Fragment2.java

 包com.tabs.example;

进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.TextView;

进口java.text.DateFormat中;
进口java.text.SimpleDateFormat的;
进口java.util.Date;

公共类Fragment2扩展片段{

    @覆盖
    公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,捆绑savedInstanceState){

        查看根= inflater.inflate(R.layout.fragment2,集装箱,假);

        日期格式日期格式=新的SimpleDateFormat(HH:MM:SS);
        日期日期=新的日期();
        字符串时间= dateFormat.format(日期);

        TextView的TV2 =(TextView中)root.findViewById(R.id.tv2);
        tv2.setText(时间);

        返回根;

    }
}
 

Fragment3.java

 包com.tabs.example;

进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.TextView;

进口java.text.DateFormat中;
进口java.text.SimpleDateFormat的;
进口java.util.Date;

公共类Fragment3扩展片段{

    @覆盖
    公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,捆绑savedInstanceState){

        查看根= inflater.inflate(R.layout.fragment3,集装箱,假);

        日期格式日期格式=新的SimpleDateFormat(HH:MM:SS);
        日期日期=新的日期();
        字符串时间= dateFormat.format(日期);

        TextView的TV3 =(TextView中)root.findViewById(R.id.tv3);
        tv1.setText(时间);

        返回根;

    }
}
 

解决方案

您可以通过设置ViewPagerAdapter这样的缓存它们:

  mViewPager.setOffscreenPageLimit(3);
 

I'm trying to make an application with multiple Tabs. For each tab I'm using different fragments. And when I leaf through tabs the information in them is changing.

How can I save the state of each tab when swiping?

Code for example:

MainActivity.java:

package com.tabs.example;

import java.util.Locale;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;

public class MainActivity extends FragmentActivity {

    SectionsPagerAdapter mSectionsPagerAdapter;
    ViewPager            mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        PagerTabStrip pagerTabStrip = (PagerTabStrip) findViewById(R.id.pager_tab_strip);
        pagerTabStrip.setBackgroundColor(Color.BLACK);
        pagerTabStrip.setTabIndicatorColor(Color.CYAN);
        pagerTabStrip.setTextColor(Color.WHITE);
    }

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {

            Fragment fragment;
            switch (position) {
                case 0:
                    fragment = new Fragment1();
                    break;
                case 1:
                    fragment = new Fragment2();
                    break;
                case 2:
                    fragment = new Fragment3();
                    break;
                default:
                    fragment  = null;
                    break;
            }
            return fragment;

        }

        @Override
        public int getCount() {
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            Locale l = Locale.getDefault();
            switch (position) {
                case 0:
                    return getString(R.string.title_section1).toUpperCase(l);
                case 1:
                    return getString(R.string.title_section2).toUpperCase(l);
                case 2:
                    return getString(R.string.title_section3).toUpperCase(l);
            }
            return null;
        }
    }
}

Fragment1.java:

package com.tabs.example;

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.TextView;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Fragment1 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View root = inflater.inflate(R.layout.fragment1, container, false);

        DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
        Date date = new Date();
        String time = dateFormat.format(date);

        TextView tv1 = (TextView) root.findViewById(R.id.tv1);
        tv1.setText(time);

        return root;

    }
}

Fragment2.java:

package com.tabs.example;

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.TextView;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Fragment2 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View root = inflater.inflate(R.layout.fragment2, container, false);

        DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
        Date date = new Date();
        String time = dateFormat.format(date);

        TextView tv2 = (TextView) root.findViewById(R.id.tv2);
        tv2.setText(time);

        return root;

    }
}

Fragment3.java:

package com.tabs.example;

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.TextView;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Fragment3 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View root = inflater.inflate(R.layout.fragment3, container, false);

        DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
        Date date = new Date();
        String time = dateFormat.format(date);

        TextView tv3 = (TextView) root.findViewById(R.id.tv3);
        tv1.setText(time);

        return root;

    }
}

解决方案

You can cache them all by setting the ViewPagerAdapter like this:

mViewPager.setOffscreenPageLimit(3);

这篇关于刷卡时​​,Android的滚动标签+刷卡状态的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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