ViewPager既不显示动作条,也不PagerSlidingTabStrip [英] ViewPager neither shows ActionBar nor PagerSlidingTabStrip
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问题描述
下面是我已经实施了ViewPager和添加PagerSlidingTabStrip.But我viewpager既不显示动作条也显示PagerSlidingTabStrip.If我尝试添加actionBar.show()内onResume()的应用程序崩溃显示空指针异常code 。
进口android.app.Fragment;
进口android.os.Bundle;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.ViewPager;
进口com.astuetz.PagerSlidingTabStrip;
公共类MainActivity扩展FragmentActivity {
私人android.support.v4.app.Fragment currentFragment; @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
ViewPager寻呼机=(ViewPager)findViewById(R.id.viewPager);
pager.setAdapter(新MyPagerAdapter(getSupportFragmentManager()));
PagerSlidingTabStrip标签=(PagerSlidingTabStrip)findViewById(R.id.tabs);
tabs.setViewPager(寻呼机); } 私有类MyPagerAdapter扩展FragmentPagerAdapter {
私有String []标题= {Titleme,Titletos,Titleos,标题,MeTitle5,TITLE6,TITLE7,TITLE8};
公共MyPagerAdapter(FragmentManager FM){
超(FM);
}
@覆盖
公共CharSequence的getPageTitle(INT位置){
回到标题[位置]
}
@覆盖
公共android.support.v4.app.Fragment的getItem(INT POS){
捆绑ARGS =新包(); 开关(POS){ 情况下0:
currentFragment =新HomeFragment();
打破;
情况1: currentFragment =新HomeFragment5();
打破;
案例2: currentFragment =新HomeFragment4(); 打破;
案例3: currentFragment =新HomeFragment3(); 打破;
情况4: currentFragment =新HomeFragment4(); 打破;
情况5:
currentFragment =新ChlHome();
打破;
情况6:
currentFragment =新GiFragment();
打破;
案例7:
currentFragment =新FlList();
打破;
默认:
}
返回currentFragment;
} @覆盖
公众诠释的getCount(){
返回8;
}
}
}
XML
<?XML版本=1.0编码=UTF-8&GT?;
<的RelativeLayout的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent机器人:layout_height =match_parent>
<的FrameLayout
机器人:ID =@ + ID / main_frame
机器人:layout_width =match_parent
机器人:layout_height =match_parent/> < android.support.v4.view.ViewPager
的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:程序=http://schemas.android.com/apk/res-auto
机器人:ID =@ + ID / viewPager
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
< com.astuetz.PagerSlidingTabStrip
机器人:ID =@ + ID /标签
机器人:layout_width =match_parent
机器人:layout_height =48dip/>
/>
< /android.support.v4.view.ViewPager>
< / RelativeLayout的>
解决方案
在 PagerSlidingTabStrip
项目的GitHub的页面使用的是:
- 包括在你的布局PagerSlidingTabStrip部件。这通常应放在ViewPager它上面再presents。
所以,你布局要沿着线的东西:
<的RelativeLayout的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent机器人:layout_height =match_parent>
< com.astuetz.PagerSlidingTabStrip
机器人:ID =@ + ID /标签
机器人:layout_width =match_parent
机器人:layout_height =48dip/>
< android.support.v4.view.ViewPager
的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:程序=http://schemas.android.com/apk/res-auto
机器人:ID =@ + ID / viewPager
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:layout_below =@ + ID /标签
机器人:layout_alignParentBottom =真/>
< / RelativeLayout的>
Below is the code which i have implemented for ViewPager and adding PagerSlidingTabStrip.But my viewpager neither shows ActionBar nor shows PagerSlidingTabStrip.If i try to add actionBar.show() inside onResume() app crashes showing null pointer exception.
import android.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import com.astuetz.PagerSlidingTabStrip;
public class MainActivity extends FragmentActivity {
private android.support.v4.app.Fragment currentFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
tabs.setViewPager(pager);
}
private class MyPagerAdapter extends FragmentPagerAdapter {
private String[] titles={"Titleme", "Titletos","Titleos", "Titles","MeTitle5","Title6","Title7","Title8"};
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
@Override
public android.support.v4.app.Fragment getItem(int pos) {
Bundle args = new Bundle();
switch (pos) {
case 0:
currentFragment = new HomeFragment();
break;
case 1:
currentFragment = new HomeFragment5();
break;
case 2:
currentFragment = new HomeFragment4();
break;
case 3:
currentFragment = new HomeFragment3();
break;
case 4:
currentFragment = new HomeFragment4();
break;
case 5:
currentFragment = new ChlHome();
break;
case 6:
currentFragment = new GiFragment();
break;
case 7:
currentFragment = new FlList();
break;
default:
}
return currentFragment;
}
@Override
public int getCount() {
return 8;
}
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<FrameLayout
android:id="@+id/main_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.astuetz.PagerSlidingTabStrip
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dip" />
/>
</android.support.v4.view.ViewPager>
</RelativeLayout>
解决方案
From the github page of the PagerSlidingTabStrip
project you are using:
- Include the PagerSlidingTabStrip widget in your layout. This should usually be placed above the ViewPager it represents.
So, you layout should be something along the lines of:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<com.astuetz.PagerSlidingTabStrip
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dip" />
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/tabs"
android:layout_alignParentBottom="true" />
</RelativeLayout>
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