我创建了一个名为 HomeFragment 的片段，它实现了swipeRefreshLayout。
我正在尝试做的是，我从服务器获取一个json数组，我从json中提取信息，并使用 HomeFragment 中的自定义适配器扩展数组适配器来扩充布局，我也有一个 MenuActivity.java ，在线性布局中有5个按钮，当点击按钮时，片段会发生变化
现在，当我运行应用程序时，按钮不会在点击时更改片段，也不会使布局膨胀。
logcat的
06-18 11:16:02.803 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.813 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.813 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.media.session.MediaController', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.813 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.widget.Toolbar', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.813 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.ActivityManager$TaskDescription', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.823 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.823 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.823 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.833 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.assist.AssistContent', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.833 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.view.SearchEvent', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.833 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.udeys.theindianroute.MenuActivity.access$super
06-18 11:16:02.973 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.udeys.theindianroute.EmptyFragment.access$super
06-18 11:16:02.973 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.udeys.theindianroute.EmptyFragment.access$super
06-18 11:16:02.983 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.udeys.theindianroute.HomeFragment.access$super
06-18 11:16:02.983 994-994/com.example.udeys.theindianroute E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.udeys.theindianroute.HomeFragment.access$super
06-18 11:16:03.033 994-994/com.example.udeys.theindianroute E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.udeys.theindianroute, PID: 994
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.udeys.theindianroute/com.example.udeys.theindianroute.MenuActivity}: java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list' that is not a ListView class
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list' that is not a ListView class
at android.app.ListFragment.ensureList(ListFragment.java:402)
at android.app.ListFragment.onViewCreated(ListFragment.java:203)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.run(BackStackRecord.java:684)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
at android.app.Activity.performStart(Activity.java:5240)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2168)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
的 MenuActivity.java
package com.example.udeys.theindianroute;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
public class MenuActivity extends AppCompatActivity implements View.OnClickListener {
ImageButton hm, srch, pst, notif, prfl;
FragmentTransaction ft;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
initFragments();
hm = (ImageButton) findViewById(R.id.home);
srch = (ImageButton) findViewById(R.id.trip);
pst = (ImageButton) findViewById(R.id.post);
notif = (ImageButton) findViewById(R.id.notification);
prfl = (ImageButton) findViewById(R.id.profile);
hm.setOnClickListener(this);
srch.setOnClickListener(this);
pst.setOnClickListener(this);
notif.setOnClickListener(this);
prfl.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int id = v.getId();
switch (id) {
case R.id.home:
ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_1, new HomeFragment());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
break;
case R.id.trip:
ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_1, new TripFragment());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
break;
case R.id.post:
ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_1, new PostFragment());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
break;
case R.id.notification:
ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_1, new NotificationFragment());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
break;
case R.id.profile:
ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_1, new ProfileFragment());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
break;
}
}
private void initFragments() {
ft = getFragmentManager().beginTransaction();
ft.add(R.id.fragment_1, new HomeFragment());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
//ft.hide(mGalleryFragment);
ft.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.menu_activity, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
// User chose the "Settings" item, show the app settings UI...
return true;
default:
// If we got here, the user's action was not recognized.
// Invoke the superclass to handle it.
return super.onOptionsItemSelected(item);
}
}
}
的 HomeFragment.java
package com.example.udeys.theindianroute;
/**
* Created by udeys on 6/17/2016.
*/
import android.app.Fragment;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ListView;
import android.widget.Toast;
import com.example.udeys.theindianroute.utils.PostAdapter;
import com.example.udeys.theindianroute.utils.posts;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.TextHttpResponseHandler;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import cz.msebera.android.httpclient.Header;
public class HomeFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
PostAdapter PostAdapter;
private SwipeRefreshLayout swipeRefreshLayout;
ListView datalist;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.homefragment, container, false);
datalist = (ListView) view.findViewById(R.id.users_posts);
swipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_refresh_layout);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
datalist.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (datalist.getChildAt(0) != null) {
swipeRefreshLayout.setEnabled(datalist.getFirstVisiblePosition() == 0 && datalist.getChildAt(0).getTop() == 0);
}
}
});
Typeface cFont = Typeface.createFromAsset(getActivity().getAssets(), "SAMARN__.TTF");
Typeface fontAwesome = Typeface.createFromAsset(getActivity().getAssets(), "fontawesome-webfont.ttf");
PostAdapter = new PostAdapter(getActivity(), R.layout.timelinerowlayout, cFont, fontAwesome);
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);
bindData();
}
}
);
}
/**
* This method is called when swipe refresh is pulled down
*/
@Override
public void onRefresh() {
bindData();
}
public void bindData() {
try {
AsyncHttpClient client = new AsyncHttpClient(true, 80, 443);
client.get("http://indianroute.roms4all.com/fetch_post.php", new TextHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, String res) {
decodeJson(res);
}
@Override
public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
Toast.makeText(getActivity(), "" + res, Toast.LENGTH_SHORT).show();
}
}
);
} catch (Exception e) {
Toast.makeText(getActivity(), "" + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
private void decodeJson(String result) {
try {
swipeRefreshLayout.setRefreshing(true);
JSONArray jArr = new JSONArray(result);
String username, story, picture, check_in, userprofilePicture;
for (int count = 0; count < jArr.length(); count++) {
JSONObject obj = jArr.getJSONObject(count);
username = obj.getString("username");
story = obj.getString("story");
picture = obj.getString("picture");
check_in = obj.getString("check_in");
userprofilePicture = obj.getString("userprofilePicture");
posts posts = new posts(username, story, picture, check_in, userprofilePicture);
swipeRefreshLayout.setRefreshing(false);
PostAdapter.add(posts);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
的 homefragment.xml
<?xml version="1.0" encoding="utf-8"?>
<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">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context="com.example.gitesh.timeline.MainActivity">
<ListView
android:id="@+id/users_posts"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</android.support.v4.widget.SwipeRefreshLayout>