方法一:
```
Runnable mRunnable = new Runnable() {
@Override
public void run() {
if (mList.size() >0 &&mRecylerView !=null) {
mRecylerView.scrollToPosition(mList.size() -1);
}
}
};
if ( mList.size() >0 && mRecylerView != null ) {
mRecylerView.scrollToPosition(mList.size() -1);
mRecylerView.postDelayed(mRunnable,50);
}
```
方法二:布局中添加两行代码:
```
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
```
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