Question

我创建了3个片段并将其设置在ViewPager,中但是当我到@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); List<Fragment> fragments=new Vector<>(); fragments.add(Fragment.instantiate(this,Discover.class.getName())); fragments.add(Fragment.instantiate(this,Category.class.getName())); fragments.add(Fragment.instantiate(this,Favory.class.getName())); PagerAdapter pageAdapter=new PagerAdapter(getSupportFragmentManager(),fragments); final ViewPager viewpager=(ViewPager) findViewById(R.id.viewpager); viewpager.setAdapter(pageAdapter); final ActionBar actionBar =getSupportActionBar(); actionBar.setStackedBackgroundDrawable(new ColorDrawable(Color.parseColor("#EFEBE9"))); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); ActionBar.TabListener tabListener =new ActionBar.TabListener(){ @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft){ viewpager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft){ } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft){ } }; TextView tD = new TextView(getApplicationContext()); tD.setText("Discover"); tD.setTextColor(Color.BLACK); TextView tF = new TextView(getApplicationContext()); tF.setText("Favory"); tF.setTextColor(Color.BLACK); TextView tC = new TextView(getApplicationContext()); tC.setText("Category"); tC.setTextColor(Color.BLACK); actionBar.addTab(actionBar.newTab().setTabListener(tabListener).setCustomView(tD)); actionBar.addTab(actionBar.newTab().setTabListener(tabListener).setCustomView(tC)); actionBar.addTab(actionBar.newTab().setTabListener(tabListener).setCustomView(tF)); viewpager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){ @Override public void onPageSelected(int position){ actionBar.setSelectedNavigationItem(position); } });的末尾时，第一个重新加载！

onOptionsItemSelected()

Answer 1

"eventDataLoader": {
          "url": "data/MSFT_events.csv",
          "format": "csv",
          "showCurtain": true,
          "showErrors": true,
          "async": true,
          "reverse": true,
          "delimiter": ",",
          "useColumnNames": true,
          "postProcess": function ( data ) {
            for ( var x in data ) {
              switch( data[x].Type ) {
                case 'A':
                  var color = "#85CDE6";
                  break;
                default:
                  var color = "#cccccc";
                  break;
              }
              data[x].Description = data[x].Description.replace( "Upgrade", "<strong style=\"color: #0c0\">Upgrade</strong>" ).replace( "Downgrade", "<strong style=\"color: #c00\">Downgrade</strong>" );
              data[x] = {
                type: "pin",
                graph: "g1",
                backgroundColor: color,
                date: data[x].Date,
                text: data[x].Type,
                description: "<strong>" + data[x].Title + "</strong><br />" + data[x].Description
              };
            }
            return data;
          }
       }

NO_OF_FRAGMENTS_IN_MEMORY是当前视图寻呼机片段左右的片段。因此，将屏幕页面限制设置为2.还要确保在适配器中getItem方法不直接创建实例。检查它是否为null然后实例化。 `

viewPager.setOffscreenPageLimit(NO_OF_FRAGMENTS_IN_MEMORY);

`

当我到viewpager结束时，第一个重新加载

1 个答案: