我将创建一个4片段页面。如果我移动到主片段意味着，片段应该刷新。如果在另一个片段中进行的任何更改意味着它将在主片段中更新。任何一个帮助我刷新主片段
public class HomeFragment extends Fragment {
ImageButton explore,chat;
//Facebook Declaration
private CallbackManager callbackManager;
private LoginButton FbLoginButton;
String fb_call = "fb";
ListView recyclerView;
RelativeLayout emptyView;
private boolean mLoading = false;
//Check Facebook
Boolean Check_activity = false;
List<String> fb_friends_list= new ArrayList<String>();
private List<FeedItem> feedsList= new ArrayList<FeedItem>();
CustomHomeFragmentAdapter adapter;
String LiveUrl,userID,Facebook_Token;
protected static final String TAG = "HomeFragment";
public static final String MY_PREFS_NAME = "MyPrefsFile";
boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
//Progresswheel
ProgressWheel pw;
ResetPasswordActivity obj=new ResetPasswordActivity();
public HomeFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getContext());
callbackManager = CallbackManager.Factory.create();
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getContext());
LiveUrl= sharedPreferences.getString("liveurl3", null);
System.out.println("Liveurl1" + LiveUrl);
SharedPreferences prefs1 = getContext().getSharedPreferences(MY_PREFS_NAME, getContext().MODE_PRIVATE);
userID= prefs1.getString("userid", null);
System.out.println("userid" + userID);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_home, container, false);
FontChangeCrawler fontChanger = new FontChangeCrawler(getContext().getAssets(), "arial.ttf");
fontChanger.replaceFonts((ViewGroup) v);
// Inflate the layout for this fragment
System.out.println("Home");
pw=(ProgressWheel)v.findViewById(R.id.pw_spinner);
obj.styleRandom(pw, v.getContext());
emptyView=(RelativeLayout)v.findViewById(R.id.empty_view);
recyclerView=(ListView)v.findViewById(R.id.recycler_view);
adapter=new CustomHomeFragmentAdapter(getContext(),feedsList,HomeFragment.this);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
getHomePosts();
recyclerView.setRecyclerListener(new AbsListView.RecyclerListener() {
@Override
public void onMovedToScrapHeap(View view) {
VideoView videoView = (VideoView) view.findViewById(R.id.post_video);
videoView.stopPlayback();
}
});
explore= (ImageButton) v.findViewById(R.id.explore_page);
chat= (ImageButton) v.findViewById(R.id.edit_page);
chat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent chat=new Intent(getContext(),ChatActivity.class);
startActivity(chat);
}
});
FbLoginButton = (LoginButton) v.findViewById(R.id.fb_login_button);
FbLoginButton.setBackgroundResource(R.drawable.rounded_button);
FbLoginButton.setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
FbLoginButton.setCompoundDrawablePadding(0);
FbLoginButton.setPadding(0, 0, 0, 0);
FbLoginButton.setText("Find People to follow");
FbLoginButton.setTextColor(Color.WHITE);
List<String> permissions = new ArrayList<>();
permissions.add("user_friends");
FbLoginButton.setReadPermissions(permissions);
FbLoginButton.setFragment(this);
FbLoginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//FbLoginButton.setEnabled(false);
}
});
FbLoginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
Facebook_Token = loginResult.getAccessToken().getToken();
new GraphRequest(
AccessToken.getCurrentAccessToken(),
"/me/friends",
null,
HttpMethod.GET,
new GraphRequest.Callback() {
public void onCompleted(GraphResponse response) {
LoginManager.getInstance().logOut();
System.out.println("response for friends" + response.toString());
JSONObject obj = response.getJSONObject();
System.out.println("obj" + obj);
JSONArray arr;
try {
arr = obj.getJSONArray("data");
System.out.println("array value" + arr);
if (arr.length() != 0) {
for (int i = 0; i < arr.length(); i++) {
JSONObject fbfriends = arr.getJSONObject(i);
String id = fbfriends.getString("id");
fb_friends_list.add(id);
System.out.println("facebook friends list" + fb_friends_list);
String ids = fb_friends_list.toString().replaceAll("\\[", "").replaceAll("\\]", "").replaceAll(" ", "");
Intent intent = new Intent(getContext(), FacebookFriendsActivity.class);
intent.putExtra("friendslist", ids);
intent.putExtra("fb_call", fb_call);
startActivity(intent);
}
} else {
Toast.makeText(getContext(), "No Friends are using Hotfuse", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
System.out.println("inside exception");
e.printStackTrace();
}
}
}
).executeAsync();
}
@Override
public void onCancel() {
Toast.makeText(getActivity(), "Login cancelled by user!", Toast.LENGTH_LONG).show();
System.out.println("Facebook Login failed!!");
}
@Override
public void onError(FacebookException e) {
Toast.makeText(getActivity(), "Login unsuccessful!", Toast.LENGTH_LONG).show();
System.out.println("Facebook Login failed!!");
}
});
explore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getChildFragmentManager()
.beginTransaction()
.replace(
R.id.homefragment,
new ExploreFragment(),
ExploreFragment.TAG)
.addToBackStack(null)
.commit();
}
});
return v;
}
//Call Facebook StartActivity
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}
public void getHomePosts()
{
pw.setVisibility(View.VISIBLE);
pw.startSpinning();
//String url=LiveUrl+"followingactivities?user_id="+userID;
String url=LiveUrl+"post_data/?user_id="+userID;
System.out.println("URL IS" + url);
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
pw.setVisibility(View.GONE);
pw.stopSpinning();
JSONObject suggested_jsonobj = response.getJSONObject(i);
FeedItem movie = new FeedItem();
System.out.println("user_id value" +suggested_jsonobj.optString("user_id"));
if (!suggested_jsonobj.optString("user_id").isEmpty())
{
movie.setTitle(suggested_jsonobj.optString("username"));
movie.setId(suggested_jsonobj.optString("user_id"));
movie.setPostID(suggested_jsonobj.optString("id"));
movie.setVideoID(suggested_jsonobj.optString("video_src"));
movie.setVideoImage(suggested_jsonobj.optString("image_thumb"));
movie.setThumbnail(suggested_jsonobj.optString("profile_image"));
movie.setDate(suggested_jsonobj.optString("created"));
movie.setVotecount(suggested_jsonobj.optString("votecount"));
movie.setPost(suggested_jsonobj.optString("resize1"));
movie.setPrivacyStatus(suggested_jsonobj.optString("privacy_status"));
movie.setLikedStatus(suggested_jsonobj.optString("like_status"));
movie.setLikedCount(suggested_jsonobj.optString("like_count"));
movie.setLikeduserID(suggested_jsonobj.optString("like_user_id1"));
movie.setLikedUserName(suggested_jsonobj.optString("like_username1"));
movie.setCommentCount(suggested_jsonobj.optString("comment_count"));
movie.setCaption(suggested_jsonobj.optString("caption"));
movie.setCaptionUserName(suggested_jsonobj.optString("captionusername"));
movie.setTagCount(suggested_jsonobj.optString("tag_count"));
if (!suggested_jsonobj.optString("image_tag").matches("null")) {
final JSONArray arr = new JSONArray(suggested_jsonobj.optString("image_tag"));
final JSONObject jObj = arr.optJSONObject(0);
movie.setx1Tag(jObj.optString("x1"));
movie.sety1Tag(jObj.optString("y1"));
movie.setx1userName(jObj.optString("name1"));
movie.setx1userID(jObj.optString("user_id1"));
movie.setx2Tag(jObj.optString("x2"));
movie.sety2Tag(jObj.optString("y2"));
movie.setx2userName(jObj.optString("name2"));
movie.setx2userID(jObj.optString("user_id2"));
movie.setx3Tag(jObj.optString("x3"));
movie.sety3Tag(jObj.optString("y3"));
movie.setx3userName(jObj.optString("name3"));
movie.setx3userID(jObj.optString("user_id3"));
movie.setx4Tag(jObj.optString("x4"));
movie.sety4Tag(jObj.optString("y4"));
movie.setx4userName(jObj.optString("name4"));
movie.setx4userID(jObj.optString("user_id4"));
}if (!suggested_jsonobj.optString("comment").isEmpty()) {
final JSONArray arr = new JSONArray(suggested_jsonobj.optString("comment"));
final JSONObject jObj = arr.optJSONObject(0);
//Comment 1
movie.setCommentID(jObj.optString("id"));
movie.setCommentuserName(jObj.optString("username"));
movie.setCommentProPic(jObj.optString("image"));
movie.setCommentText(jObj.optString("comment"));
//Comment 2
final JSONObject jObj1 = arr.optJSONObject(1);
if(jObj1!=null) {
movie.setCommentID2(jObj1.optString("id"));
movie.setCommentuserName2(jObj1.optString("username"));
movie.setCommentProPic2(jObj1.optString("image"));
movie.setCommentText2(jObj1.optString("comment"));
}
//Comment 3
final JSONObject jObj2 = arr.optJSONObject(2);
if(jObj2!=null) {
movie.setCommentID3(jObj2.optString("id"));
movie.setCommentuserName3(jObj2.optString("username"));
movie.setCommentProPic3(jObj2.optString("image"));
movie.setCommentText3(jObj2.optString("comment"));
}
}
feedsList.add(movie);
}
else
{
recyclerView.setVisibility(View.GONE);
emptyView.setVisibility(View.VISIBLE);
}
} catch (JSONException e) {
pw.setVisibility(View.GONE);
pw.stopSpinning();
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if(error instanceof NoConnectionError) {
pw.setVisibility(View.GONE);
pw.stopSpinning();
Toast.makeText(getContext(), "Sorry we couldn't complete your request.Please try again in a moment", Toast.LENGTH_SHORT).show();
}
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
movieReq.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 2, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
}
/* public void switchContent(int id,String id1) {
getChildFragmentManager()
.beginTransaction()
.replace(id, ParallaxProfileActivity.newInstance(id1), ParallaxProfileActivity.TAG)
.commit();
}*/
/*
@Override
public void onDetach() {
super.onDetach();
try {
Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
childFragmentManager.setAccessible(true);
childFragmentManager.set(this, null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}*/
public class MyCustomLayoutManager extends LinearLayoutManager {
private static final float MILLISECONDS_PER_INCH = 50f;
private Context mContext;
public MyCustomLayoutManager(Context context) {
super(context);
mContext = context;
}
@Override
public void smoothScrollToPosition(RecyclerView recyclerView,
RecyclerView.State state, final int position) {
LinearSmoothScroller smoothScroller =
new LinearSmoothScroller(mContext) {
//This controls the direction in which smoothScroll looks
//for your view
@Override
public PointF computeScrollVectorForPosition
(int targetPosition) {
return MyCustomLayoutManager.this
.computeScrollVectorForPosition(targetPosition);
}
//This returns the milliseconds it takes to
//scroll one pixel.
@Override
protected float calculateSpeedPerPixel
(DisplayMetrics displayMetrics) {
return MILLISECONDS_PER_INCH/displayMetrics.densityDpi;
}
};
smoothScroller.setTargetPosition(position);
startSmoothScroll(smoothScroller);
}
}
}
`
答案 0 :(得分：0)
我在onCreate函数中添加了这个编码来刷新主片段，但它显示错误
Fragment frg = null;
frg = getSupportFragmentManager().findFragmentByTag("HomeFragment");
final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.detach(frg);
ft.attach(frg);
ft.commit();