1+ package com .dds .anyui ;
2+
3+ import android .content .Context ;
4+ import android .content .Intent ;
5+ import android .os .Bundle ;
6+
7+ import androidx .annotation .NonNull ;
8+ import androidx .fragment .app .Fragment ;
9+ import androidx .fragment .app .FragmentActivity ;
10+ import androidx .recyclerview .widget .GridLayoutManager ;
11+ import androidx .recyclerview .widget .LinearLayoutManager ;
12+ import androidx .recyclerview .widget .RecyclerView ;
13+
14+ import android .view .LayoutInflater ;
15+ import android .view .View ;
16+ import android .view .ViewGroup ;
17+ import android .widget .TextView ;
18+
19+ import com .dds .recyclerview .RecyclerActivity ;
20+
21+ import java .util .ArrayList ;
22+ import java .util .List ;
23+
24+ /**
25+ * A fragment representing a list of Items.
26+ */
27+ public class ItemFragment extends Fragment {
28+
29+ private static final String ARG_COLUMN_COUNT = "column-count" ;
30+ private int mColumnCount = 1 ;
31+
32+ static {
33+ addItem ("测试1" , RecyclerActivity .class );
34+ addItem ("测试2" , RecyclerActivity .class );
35+ addItem ("测试3" , RecyclerActivity .class );
36+ addItem ("测试4" , RecyclerActivity .class );
37+
38+ }
39+
40+ public static void addItem (String content , Class <?> clazz ) {
41+ PlaceholderContent .addItem (new PlaceholderContent .PlaceholderItem (content , clazz ));
42+ }
43+
44+ public ItemFragment () {
45+ }
46+
47+ public static ItemFragment newInstance (int columnCount ) {
48+ ItemFragment fragment = new ItemFragment ();
49+ Bundle args = new Bundle ();
50+ args .putInt (ARG_COLUMN_COUNT , columnCount );
51+ fragment .setArguments (args );
52+ return fragment ;
53+ }
54+
55+ @ Override
56+ public void onCreate (Bundle savedInstanceState ) {
57+ super .onCreate (savedInstanceState );
58+
59+ if (getArguments () != null ) {
60+ mColumnCount = getArguments ().getInt (ARG_COLUMN_COUNT );
61+ }
62+ }
63+
64+ @ Override
65+ public View onCreateView (LayoutInflater inflater , ViewGroup container ,
66+ Bundle savedInstanceState ) {
67+ View view = inflater .inflate (R .layout .fragment_item_list , container , false );
68+
69+ // Set the adapter
70+ if (view instanceof RecyclerView ) {
71+ Context context = view .getContext ();
72+ RecyclerView recyclerView = (RecyclerView ) view ;
73+ if (mColumnCount <= 1 ) {
74+ recyclerView .setLayoutManager (new LinearLayoutManager (context ));
75+ } else {
76+ recyclerView .setLayoutManager (new GridLayoutManager (context , mColumnCount ));
77+ }
78+ MyItemRecyclerViewAdapter adapter = new MyItemRecyclerViewAdapter (PlaceholderContent .ITEMS );
79+ adapter .setOnItemClickListener ((view1 , placeholderItem , position ) -> {
80+ FragmentActivity activity = getActivity ();
81+ if (activity != null ) {
82+ activity .startActivity (new Intent (activity , placeholderItem .clazz ));
83+ }
84+ });
85+ recyclerView .setAdapter (adapter );
86+ }
87+ return view ;
88+ }
89+
90+
91+ public static class MyItemRecyclerViewAdapter extends RecyclerView .Adapter <MyItemRecyclerViewAdapter .ViewHolder > {
92+
93+ private final List <PlaceholderContent .PlaceholderItem > mValues ;
94+ private OnItemClickListener mOnItemClickListener ;
95+
96+ public MyItemRecyclerViewAdapter (List <PlaceholderContent .PlaceholderItem > items ) {
97+ mValues = items ;
98+ }
99+
100+ @ NonNull
101+ @ Override
102+ public ViewHolder onCreateViewHolder (ViewGroup parent , int viewType ) {
103+ ViewHolder viewHolder = new ViewHolder (LayoutInflater .from (parent .getContext ()).inflate (R .layout .fragment_item , parent , false ));
104+ bindViewClickListener (viewHolder );
105+ return viewHolder ;
106+ }
107+
108+ private void bindViewClickListener (ViewHolder viewHolder ) {
109+ bindViewItemClickListener (viewHolder );
110+ }
111+
112+ private void bindViewItemClickListener (ViewHolder viewHolder ) {
113+ viewHolder .itemView .setOnClickListener (v -> {
114+ if (mOnItemClickListener != null ) {
115+ int position = viewHolder .getAbsoluteAdapterPosition ();
116+ PlaceholderContent .PlaceholderItem placeholderItem = mValues .get (position );
117+ mOnItemClickListener .onItemClick (viewHolder .itemView , placeholderItem , position );
118+ }
119+
120+
121+ });
122+ }
123+
124+ @ Override
125+ public void onBindViewHolder (final ViewHolder holder , int position ) {
126+ holder .mItem = mValues .get (position );
127+ holder .mContentView .setText (mValues .get (position ).content );
128+ }
129+
130+ @ Override
131+ public int getItemCount () {
132+ return mValues .size ();
133+ }
134+
135+ public void setOnItemClickListener (OnItemClickListener l ) {
136+ mOnItemClickListener = l ;
137+ }
138+
139+ public static class ViewHolder extends RecyclerView .ViewHolder {
140+ public final TextView mContentView ;
141+ public PlaceholderContent .PlaceholderItem mItem ;
142+
143+ public ViewHolder (View view ) {
144+ super (view );
145+ mContentView = view .findViewById (R .id .content );
146+ }
147+
148+ @ NonNull
149+ @ Override
150+ public String toString () {
151+ return super .toString () + " '" + mContentView .getText () + "'" ;
152+ }
153+
154+ }
155+
156+ public interface OnItemClickListener {
157+ void onItemClick (View view , PlaceholderContent .PlaceholderItem placeholderItem , int position );
158+ }
159+ }
160+
161+ public static class PlaceholderContent {
162+
163+ public static final List <PlaceholderContent .PlaceholderItem > ITEMS = new ArrayList <>();
164+
165+ public static void addItem (PlaceholderContent .PlaceholderItem item ) {
166+ ITEMS .add (item );
167+ }
168+
169+ /**
170+ * A placeholder item representing a piece of content.
171+ */
172+ public static class PlaceholderItem {
173+ public final String content ;
174+ public final Class <?> clazz ;
175+
176+ public PlaceholderItem (String content , Class <?> clazz ) {
177+ this .content = content ;
178+ this .clazz = clazz ;
179+ }
180+
181+ @ NonNull
182+ @ Override
183+ public String toString () {
184+ return content ;
185+ }
186+ }
187+ }
188+
189+
190+ }
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