android:imeOptions="actionSearch"
android:singleLine="true"

<EditText
                android:id="@+id/key_edt"
                android:layout_width="match_parent"
                android:layout_height="33dp"
                android:layout_toRightOf="@id/xiala_iv"
                android:background="@null"
                android:hint="@string/key_search"
                android:imeOptions="actionSearch"
                android:singleLine="true"
                android:textColor="@color/black_content"
                android:textColorHint="#CCCCCC" />