我正在尝试在操作栏中设置选项卡式导航。当您点击一个选项卡时，frameLayout 应更改为该活动中 4 个可能的片段之一。
但是，它卡在第一个片段中，当我点击选项卡时，什么也没有发生。关于什么可能是错的任何想法？我怀疑我在处理选项卡的侦听器方面做错了，但我无法弄清楚（非常令人沮丧）。有什么帮助吗？提前致谢。
Form.java（主应用程序）
package com.example.ehistory;
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
@SuppressLint("NewApi")
public class Form extends FragmentActivity {
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_form1);
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setDisplayShowTitleEnabled(false);
Tab tab = actionBar.newTab()
//.setText(R.string.anamnesis)
.setIcon(R.drawable.id)
.setTabListener(new TabListener<Frag1>(
this, "anamnesis", Frag1.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
//.setText(R.string.symptom)
.setIcon(R.drawable.current)
.setTabListener(new TabListener<Frag2>(
this, "symptom", Frag2.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
//.setText(R.string.otherhistory)
.setIcon(R.drawable.past)
.setTabListener(new TabListener<Frag3>(
this, "otherhistory", Frag3.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
//.setText(R.string.ros)
.setIcon(R.drawable.ros)
.setTabListener(new TabListener<Frag4>(
this, "ros", Frag4.class));
actionBar.addTab(tab);
if (findViewById(R.id.fragment_container) != null) {
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
// Create an instance of ExampleFragment
Frag1 firstFragment = new Frag1();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
firstFragment.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
//don't forget are you sure you don't want to save bullshit
case R.id.newpatient:
Intent intent = new Intent(Form.this, Form.class);
Form.this.startActivity(intent);
default: break;
}
return true;
}
public static class TabListener<T extends Fragment> implements ActionBar.TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
/** Constructor used each time a new tab is created.
* @param activity The host Activity, used to instantiate the fragment
* @param tag The identifier tag for the fragment
* @param clz The fragment's Class, used to instantiate the fragment
*/
public TabListener(Activity activity, String tag, Class<T> clz) {
mActivity = activity;
mTag = tag;
mClass = clz;
}
/* The following are each of the ActionBar.TabListener callbacks */
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// Check if the fragment is already initialized
if (mFragment == null) {
// If not, instantiate and add it to the activity
mFragment = Fragment.instantiate(mActivity, mClass.getName());
ft.replace(R.id.fragment_container, mFragment, mTag);
ft.commit();
} else {
// If it exists, simply attach it in order to show it
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// User selected the already selected tab. Usually do nothing.
}
@Override
public void onTabReselected(Tab arg0,
android.app.FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab arg0, android.app.FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabUnselected(Tab arg0,
android.app.FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
}
}
Frag1.java（片段之一）
package com.example.ehistory;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Spinner;
public class Frag1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_form, container, false);
Spinner spinner = (Spinner) v.findViewById(R.id.gender_spin);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this.getActivity(),
R.array.genders, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
AutoCompleteTextView textView = (AutoCompleteTextView) v.findViewById(R.id.ethnicity_edit);
String[] ethnicities = getResources().getStringArray(R.array.ethnicity_array);
ArrayAdapter<String> adapter_auto =
new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1, ethnicities);
textView.setAdapter(adapter_auto);
AutoCompleteTextView textView1 = (AutoCompleteTextView) v.findViewById(R.id.nationality_edit);
String[] nationalities = getResources().getStringArray(R.array.nationality_array);
ArrayAdapter<String> adapter_auto1 =
new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1, nationalities);
textView1.setAdapter(adapter_auto1);
Spinner spinner1 = (Spinner) v.findViewById(R.id.leg_spin);
ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(this.getActivity(),
R.array.legal_status, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter1);
AutoCompleteTextView textView2 = (AutoCompleteTextView) v.findViewById(R.id.religion_edit);
String[] religions = getResources().getStringArray(R.array.religions);
ArrayAdapter<String> adapter_auto2 =
new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1, religions);
textView2.setAdapter(adapter_auto2);
return v;
}
}