Question

当我尝试在 setCurrentItem(arg0.getPosition()) 方法中使用 onTabSelected() 时，我的应用会崩溃，同时实现我点击标签{{{下面的1}}也应该随之改变.....它的另一种方式就是当我轻扫时，fragment随之改变。

代码如下：

Tab

@TargetApi(Build.VERSION_CODES.HONEYCOMB) public class AboutUs extends FragmentActivity implements TabListener { private ActionBar actionBar; ViewPager viewPager; @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.aboutus); intialization(); } @TargetApi(Build.VERSION_CODES.HONEYCOMB) private void intialization() { // TODO Auto-generated method stub actionBar = getActionBar(); //this is the line where the application crashes actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); ActionBar.Tab tab1 = actionBar.newTab(); tab1.setText("MUMTAZ ANWAR"); tab1.setTabListener(this); ActionBar.Tab tab2 = actionBar.newTab(); tab2.setText("CREDIENTIALS"); tab2.setTabListener(this); actionBar.addTab(tab1); actionBar.addTab(tab2); viewPager = (ViewPager) findViewById(R.id.pagger); viewPager.setAdapter(new MyAdapter(getSupportFragmentManager())); viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int arg0) { // TODO Auto-generated method stub actionBar.setSelectedNavigationItem(arg0); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } }); } @Override public void onTabReselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub //Log.d("HAMZA", "onTabReselected at " + "position" + tab.getPosition() // + "name" + tab.getText()); } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub //Log.d("HAMZA", "onTabselected at " + "position" + tab.getPosition() // + "name" + tab.getText()); //this is the line where the application crashes viewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub //Log.d("HAMZA", "onTabUnselected at " + "position" + tab.getPosition() // + "name" + tab.getText()); } }：

MyAdapter.java

Answer 1

您需要做的就是在添加选项卡之前初始化View寻呼机，即重新排序视图寻呼机初始化语句并在初始化（）中添加制表符语句。见下文

viewPager = (ViewPager) findViewById(R.id.pagger);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

    @Override
    public void onPageSelected(int arg0) {
        // TODO Auto-generated method stub
        actionBar.setSelectedNavigationItem(arg0);
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        // TODO Auto-generated method stub

    }
});
      ActionBar.Tab tab1 = actionBar.newTab();
      tab1.setText("MUMTAZ ANWAR");
      tab1.setTabListener(this);

     ActionBar.Tab tab2 = actionBar.newTab();
     tab2.setText("CREDIENTIALS");
     tab2.setTabListener(this);

     actionBar.addTab(tab1);
     actionBar.addTab(tab2);

希望这有帮助。

Answer 2

我相信，正如humblerookie所说，这是一个有序的问题。按照下面的代码中的顺序。它应该可以帮到你。

//Create View Pager first
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getSupportActionBar();
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

// Add Tabs next
ActionBar.Tab tab1 = actionBar.newTab();
tab1.setText("MUMTAZ ANWAR");
tab1.setTabListener(this);

ActionBar.Tab tab2 = actionBar.newTab();
tab2.setText("CREDIENTIALS");
tab2.setTabListener(this);

actionBar.addTab(tab1);
actionBar.addTab(tab2);


    // finally, set the pagelistener : swiping the viewpager make respective tab selected
    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            // on changing the page
            // make respected tab selected
            actionBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    });

标签不会在android中滑动

2 个答案: