update: add toggleCollapsed method && update the demo to show usage with RecyclerView

Author: deskid

app/src/main/java/com/borjabravo/readmoretextviewsample/MainActivity.java

@@ -11,8 +11,16 @@
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.borjabravo.readmoretextview.ReadMoreTextView;
+
+import java.util.ArrayList;
+import java.util.List;
+
 public class MainActivity extends AppCompatActivity {
 
+    private static final int COUNT = 30;
+    private List<Item> mItems = new ArrayList<>();
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -27,11 +35,27 @@ protected void onCreate(Bundle savedInstanceState) {
         text4.setText(getString(R.string.one_line_text));
         RecyclerView listView = (RecyclerView) findViewById(R.id.list);
         listView.setLayoutManager(new LinearLayoutManager(this));
-        listView.setAdapter(new ItemAdapter());
+        initMockData();
+        listView.setAdapter(new ItemAdapter(mItems));
+    }
+
+    private void initMockData() {
+        for (int i = 0; i < COUNT; i++) {
+            Item item = new Item();
+            item.text = i + " : " + getString(R.string.lorem_ipsum);
+            item.readMore = true;
+            mItems.add(item);
+        }
     }
 
     static class ItemAdapter extends RecyclerView.Adapter<ViewHolder> {
 
+        private List<Item> mItems;
+
+        public ItemAdapter(List<Item> items) {
+            mItems = new ArrayList<>(items);
+        }
+
         @Override
         public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
             View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
@@ -41,31 +65,46 @@ public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         @Override
         public void onBindViewHolder(ViewHolder holder, final int position) {
             final Context context = holder.itemView.getContext();
-            holder.text.setText(context.getString(R.string.lorem_ipsum));
+            holder.text.setText(mItems.get(position).text);
             holder.itemView.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
                     Toast.makeText(context, "you clicked " + position, Toast.LENGTH_SHORT).show();
                 }
             });
 
-            //todo ReadMoreTextView should have a pulbic method to reset textView's collapse status
-            // e.g.
-            //((ReadMoreTextView) holder.itemView).setCollapsed(position % 2 == 0)
+            holder.text.setToggleWatcher(new ReadMoreTextView.Watcher() {
+                @Override
+                public void onExpanded() {
+                    mItems.get(position).readMore = false;
+                }
+
+                @Override
+                public void onCollapsed() {
+                    mItems.get(position).readMore = true;
+                }
+            });
+
+            holder.text.toggleCollapsed(mItems.get(position).readMore);
         }
 
         @Override
         public int getItemCount() {
-            return 10;
+            return mItems.size();
         }
     }
 
     static class ViewHolder extends RecyclerView.ViewHolder {
-        TextView text;
+        ReadMoreTextView text;
 
         public ViewHolder(View itemView) {
             super(itemView);
-            text = (TextView) itemView.findViewById(R.id.text);
+            text = (ReadMoreTextView) itemView.findViewById(R.id.text);
         }
     }
+
+    static class Item {
+        public String text;
+        public boolean readMore;
+    }
 }

readmoretextview/src/main/java/com/borjabravo/readmoretextview/ReadMoreTextView.java

@@ -59,6 +59,8 @@ public class ReadMoreTextView extends TextView {
     private int lineEndIndex;
     private int trimLines;
 
+    private Watcher watcher;
+
     public ReadMoreTextView(Context context) {
         this(context, null);
     }
@@ -168,6 +170,9 @@ private CharSequence getTrimmedText(CharSequence text) {
     }
 
     private CharSequence updateCollapsedText() {
+        if (watcher != null) {
+            watcher.onCollapsed();
+        }
         int trimEndIndex = text.length();
         switch (trimMode) {
             case TRIM_MODE_LINES:
@@ -195,6 +200,9 @@ private CharSequence updateCollapsedText() {
     }
 
     private CharSequence updateExpandedText() {
+        if (watcher != null) {
+            watcher.onExpanded();
+        }
         if (showTrimExpandedText) {
             SpannableStringBuilder s = new SpannableStringBuilder(text, 0, text.length()).append(trimExpandedText);
             return addClickableSpan(s, trimExpandedText);
@@ -207,6 +215,15 @@ private CharSequence addClickableSpan(SpannableStringBuilder s, CharSequence tri
         return s;
     }
 
+    public void toggleCollapsed(boolean readMore) {
+        this.readMore = readMore;
+        setText();
+    }
+
+    public void setToggleWatcher(Watcher watcher) {
+        this.watcher = watcher;
+    }
+
     public void setTrimLength(int trimLength) {
         this.trimLength = trimLength;
         setText();
@@ -279,4 +296,10 @@ private void refreshLineEndIndex() {
             e.printStackTrace();
         }
     }
+
+    public interface Watcher {
+        public void onExpanded();
+
+        public void onCollapsed();
+    }
 }