我在向cwac-pager
ArrayPagerAdapter
v4
PagerAdapter
添加其他页面时遇到问题。我不得不使用该库,因为我无法使用系统MainActivity.java
动态添加新选项卡
public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {
private ViewPager viewPager;
private ArrayPagerAdapter pagerAdapter;
private TabLayout tabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setSupportActionBar((Toolbar) findViewById(R.id.app_toolbar));
tabLayout = findViewById(R.id.tab_layout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
viewPager = findViewById(R.id.pager);
pagerAdapter = new CustomPagerAdapter(getSupportFragmentManager(), new ArrayList<PageDescriptor>());
viewPager.setAdapter(pagerAdapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(this);
}
@Override
public void onStart() {
super.onStart();
pagerAdapter.add(new TestPageDescriptor());
tabLayout.addTab(tabLayout.newTab().setText("Hello"));
// Uncomment the following lines to make the app crash
pagerAdapter.add(new TestPageDescriptor()); // CRASH
tabLayout.addTab(tabLayout.newTab().setText("Hello2"));
}
@Override
public void onStop() {
super.onStop();
// Remove all the tabs (required in my main application, not in this test)
tabLayout.removeAllTabs();
for (int i = 0; i < pagerAdapter.getCount(); i++) {
pagerAdapter.remove(i);
}
}
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
private class CustomPagerAdapter extends ArrayPagerAdapter<Fragment> {
CustomPagerAdapter(FragmentManager fragmentManager, List<PageDescriptor> descriptors) {
super(fragmentManager, descriptors);
}
@Override
protected Fragment createFragment(PageDescriptor desc) {
return new TestFragment();
}
}
private class TestPageDescriptor extends SimplePageDescriptor {
TestPageDescriptor() {
super("Test","TestHey");
}
}
}
:
TestFragment.java
public class TestFragment extends Fragment {
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.test_frag, container, false);
}
}
:
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="me.test.myapplication.MainActivity"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="@+id/app_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:title="@string/app_name" />
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:minHeight="?attr/actionBarSize"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent" />
</LinearLayout>
:
test_frag.xml
LinearLayout
:只有View
MainActivity.java
,无论是哪个。
在onStart()
中查看我在I/Process: Sending signal. PID: 3877 SIG: 9
Application terminated.
中添加的评论:如果您只使用一个标签运行应用程序(方法的最后两行已注释),则活动将正确启动。但是,如果通过取消注释行添加另一个选项卡,应用程序将立即崩溃。我做错了什么?
感谢
编辑:logcat
$(".custodianautocomplete").change(function() {
var IDSelected = $(this).val();
var recovered = "Rakesh";
// $(this).parent("td").next().find("input[name=hall_location]").val("Rakesh") ;
//window.alert($(this).parent("td").next().find("input[name=hall_location]").val());
$.ajax({
url: 'getEmpName.jsp',
type : 'GET',
data : {IDSelected: IDSelected},
async: false,
success : function(response) {
recovered = response.trim();
},
fail:function (jqXHR, exception) {
console.log(jqXHR);
},
});
$(this).parent("td").next().find("input[name=hall_location]").val(recovered);
});
没有例外,没有错误。
答案 0 :(得分:1)
片段代码必须是唯一的,如the library documentation中所述。因此,正如Matt Clark指出的那样,您需要为不同的页面使用不同的标签。
请注意,您至少在问题的代码中不需要创建自己的SimplePageDescriptor
子类。您可以直接使用SimplePageDescriptor
。