Expandable TextView With Smooth Transition Animation
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Clone or download my project
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Copy TextViewExpandableAnimation.java and some resource files such as attrs.xml into your own project
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in xml layout file
<com.freecats.demo.view.TextViewExpandableAnimation xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/tv_expand" android:layout_width="wrap_content" android:layout_height="wrap_content" app:tvea_expandBitmap="@drawable/icon_green_arrow_down" app:tvea_expandLines="3" app:tvea_shrinkBitmap="@drawable/icon_green_arrow_up" app:tvea_textContentColor="@color/color_gray_light_content_text" app:tvea_textContentSize="@dimen/sp_txt_size_content" app:tvea_textExpand="@string/expand" app:tvea_textShrink="@string/shrink" app:tvea_textStateColor="@color/colorPrimary" />
in java
TextViewExpandableAnimation tvExpand = (TextViewExpandableAnimation) findViewById(R.id.tv_expand); tvExpand.setText(text);
All Done!
If you use it as an item in RecyclerView, you may have to make sure your RecyclerView Adapter's onBindViewHolder looks like this to avoid Unexpected Shrink/Expand State.
@Override public void onBindViewHolder(RecyclerViewAdapter.ViewHolder holder, final int position) { //record its state holder.tvExpand.setOnStateChangeListener(new TextViewExpandableAnimation.OnStateChangeListener() { @Override public void onStateChange(boolean isShrink) { ContentModel cm = mLists.get(position); cm.setShrink(isShrink); mLists.set(position, cm); } }); holder.tvExpand.setText(mLists.get(position).getText()); //important! reset its state as where it left holder.tvExpand.resetState(mLists.get(position).isShrink()); }
Attributes Support as below
| Attributes | format |
|---|---|
| tvea_expandLines | integer |
| tvea_expandBitmap | reference |
| tvea_shrinkBitmap | reference |
| tvea_textContentColor | color |
| tvea_textContentSize | dimension |
| tvea_textExpand | string |
| tvea_textShrink | string |
| tvea_textStateColor | color |
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.