我真的被卡住了.我在我的主要活动中使用选项卡进行了四次滑动视图,但我想要的是当用户打开应用程序时,它会自动显示第二个选项卡而不是第一个选项卡.
这是我的MainActivity.java
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "First Tab","Second Tab","Third Tab","Fourth Tab" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initilization
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on 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) {
}
});
}
@Override
public void onTabReselected(Tab tab,FragmentTransaction ft) {
}
@Override
public void onTabSelected(Tab tab,FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab,FragmentTransaction ft) {
}
这是我的main_activity.xml：
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v4.view.ViewPager>
解决方法
第二个选项卡是索引1,您需要做的就是在设置页面更改侦听器后添加setCurrentItem以将当前选项卡更改为正确的选项卡.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_paged);
... code omitted ...
/**
* on swiping the viewpager make respective tab selected
**/
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {...}
// set the default tab to the second tab
viewPager.setCurrentItem(1,false);
}
