patientlist_listview.xml
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:dividerHeight="0dp"
android:divider="@null"
android:listSelector="@drawable/list_row_selector"
/>
</android.support.v4.widget.SwipeRefreshLayout>
activity_icon_text_tabs.xml
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
OneFragment.java
package info.androidhive.materialtabs.fragments;
public class OneFragment extends Fragment {
private SwipeRefreshLayout swipeRefreshLayout;
public OneFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.patientlist_listview, container, false);
return view;
}
}
IconTextTabactivity.java
public class IconTextTabsActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
R.drawable.ic_tab_contacts
};
private static final String TAG = PatientList.class.getSimpleName();
// initially offset will be 0, later will be updated while parsing the json
private int offSet = 0;
// Movies json url
private static final String url = "http://192.168.0.102/test/apps.php";
private ProgressDialog pDialog;
private List<Patient> patientList = new ArrayList<Patient>();
private ListView listView;
private CustomListAdapter listadapter;
private SwipeRefreshLayout swipeRefreshLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_icon_text_tabs);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
setContentView(R.layout.patientlist_listview);
listView = (ListView) findViewById(R.id.list);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
listadapter = new CustomListAdapter(this, patientList);
listView.setAdapter(listadapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// changing action bar color
// getActionBar().setBackgroundDrawable(
// new ColorDrawable(Color.parseColor("#00BBD3")));
swipeRefreshLayout.setOnRefreshListener(this);
/**
* Showing Swipe Refresh animation on activity create
* As animation won't start on onCreate, post runnable is used
*/
swipeRefreshLayout.post(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(true);
fetchPatients();
}
}
);
listView.setAdapter(listadapter);
// Click event for single list row
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(IconTextTabsActivity.this, "row " + position + " was pressed", Toast.LENGTH_LONG).show();
switch (position) {
case 0:
TextView c =(TextView)view.findViewById(R.id.title);
String item = c.getText().toString();
Log.d("id", item);
break;
case 1:
break;
}
}
});
adapter.addFrag(new OneFragment(), "ONE");
adapter.addFrag(new TwoFragment(), "TWO");
adapter.addFrag(new ThreeFragment(), "THREE");
viewPager.setAdapter(adapter);
}
/**
* This method is called when swipe refresh is pulled down
*/
@Override
public void onRefresh() {
fetchPatients();
}
/**
* Fetching movies json by making http call
*/
private void fetchPatients() {
// showing refresh animation before making http call
swipeRefreshLayout.setRefreshing(true);
// appending offset to url
//String url = URL_TOP_250 + offSet;
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
Log.d("id", "hi") ;
// Parsing json
// reset the list
patientList.clear();
listadapter.notifyDataSetChanged();
for (int i = 0; i < response.length();i++) {
try {
Log.d("id","hi1") ;
Log.d("i","i:"+i);
Patient patient = new Patient();
Log.d("length", "length:" + response.length());
JSONObject objid= response.getJSONObject(i);
//get id
patient.setTitle(objid.getString("id"));
JSONObject objimage= response.getJSONObject(++i);
patient.setThumbnailUrl(objimage.getString("image"));
//Log.d("i","i:"+i);
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
*/
// adding movie to movies array
if(i%2==1)
patientList.add(patient);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
listadapter.notifyDataSetChanged();
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@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;
}
public PatientList() {
// Required empty public constructor
}
//public View onCreateView(LayoutInflater inflater, ViewGroup container,
// Bundle savedInstanceState) {
// // Inflate the layout for this fragment
// return inflater.inflate(R.layout.patientlist_listview, container, false);
//}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
我希望从数据库中获取数据并在显示页面到选项卡之前设置为listview。然而，它崩溃了。列表视图和选项卡项目可以正常运行，但我无法合并它们，我得到以下错误。请给我一些帮助。谢谢
01-11 01:22:04.467 10373-10373/? I/art: Late-enabling -Xcheck:jni
01-11 01:22:04.917 10373-10410/info.androidhive.materialtabs D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
01-11 01:22:04.934 10373-10373/info.androidhive.materialtabs D/Atlas: Validating map...
01-11 01:22:05.004 10373-10410/info.androidhive.materialtabs D/libEGL: loaded /system/lib/egl/libEGL_emulation.so
01-11 01:22:05.005 10373-10410/info.androidhive.materialtabs D/libEGL: loaded /system/lib/egl/libGLESv1_CM_emulation.so
01-11 01:22:05.024 10373-10410/info.androidhive.materialtabs D/libEGL: loaded /system/lib/egl/libGLESv2_emulation.so
01-11 01:22:05.071 10373-10410/info.androidhive.materialtabs I/OpenGLRenderer: Initialized EGL, version 1.4
01-11 01:22:05.090 10373-10410/info.androidhive.materialtabs D/OpenGLRenderer: Enabling debug mode 0
01-11 01:22:05.109 10373-10410/info.androidhive.materialtabs W/EGL_emulation: eglSurfaceAttrib not implemented
01-11 01:22:05.109 10373-10410/info.androidhive.materialtabs W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xeed0d7c0, error=EGL_SUCCESS
01-11 01:22:17.679 10373-10373/info.androidhive.materialtabs D/AndroidRuntime: Shutting down VM
01-11 01:22:17.680 10373-10373/info.androidhive.materialtabs E/AndroidRuntime: FATAL EXCEPTION: main
Process: info.androidhive.materialtabs, PID: 10373
java.lang.RuntimeException: Unable to start activity ComponentInfo{info.androidhive.materialtabs/info.androidhive.materialtabs.activity.IconTextTabsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.TabLayout.setupWithViewPager(android.support.v4.view.ViewPager)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.TabLayout.setupWithViewPager(android.support.v4.view.ViewPager)' on a null object reference
at info.androidhive.materialtabs.activity.IconTextTabsActivity.onCreate(IconTextTabsActivity.java:80)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
01-11 01:27:17.701 10373-10373/? I/Process: Sending signal. PID: 10373 SIG: 9